M65-M67
Medium Complexity

Disorders of synovium and tendon

Primary Specialty: Orthopedics
Last Updated: 2025-09-09

ICD-10 Codes (200)

200 billable
0 category headers
M66
Billable
Spontaneous rupture of synovium and tendon
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M66.0
Billable
Rupture of popliteal cyst
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M66.1
Billable
Rupture of synovium
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M66.10
Billable
Rupture of synovium, unspecified joint
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M66.11
Billable
Rupture of synovium, shoulder
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M66.111
Billable
Rupture of synovium, right shoulder
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M66.112
Billable
Rupture of synovium, left shoulder
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M66.119
Billable
Rupture of synovium, unspecified shoulder
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M66.12
Billable
Rupture of synovium, elbow
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M66.121
Billable
Rupture of synovium, right elbow
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M66.122
Billable
Rupture of synovium, left elbow
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M66.129
Billable
Rupture of synovium, unspecified elbow
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M66.13
Billable
Rupture of synovium, wrist
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M66.131
Billable
Rupture of synovium, right wrist
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M66.132
Billable
Rupture of synovium, left wrist
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M66.139
Billable
Rupture of synovium, unspecified wrist
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M66.14
Billable
Rupture of synovium, hand and fingers
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M66.141
Billable
Rupture of synovium, right hand
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M66.142
Billable
Rupture of synovium, left hand
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M66.143
Billable
Rupture of synovium, unspecified hand
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M66.144
Billable
Rupture of synovium, right finger(s)
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M66.145
Billable
Rupture of synovium, left finger(s)
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M66.146
Billable
Rupture of synovium, unspecified finger(s)
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M66.15
Billable
Rupture of synovium, hip
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M66.151
Billable
Rupture of synovium, right hip
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M66.152
Billable
Rupture of synovium, left hip
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M66.159
Billable
Rupture of synovium, unspecified hip
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M66.17
Billable
Rupture of synovium, ankle, foot and toes
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M66.171
Billable
Rupture of synovium, right ankle
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M66.172
Billable
Rupture of synovium, left ankle
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M66.173
Billable
Rupture of synovium, unspecified ankle
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M66.174
Billable
Rupture of synovium, right foot
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M66.175
Billable
Rupture of synovium, left foot
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M66.176
Billable
Rupture of synovium, unspecified foot
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M66.177
Billable
Rupture of synovium, right toe(s)
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M66.178
Billable
Rupture of synovium, left toe(s)
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M66.179
Billable
Rupture of synovium, unspecified toe(s)
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M66.18
Billable
Rupture of synovium, other site
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M66.2
Billable
Spontaneous rupture of extensor tendons
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M66.20
Billable
Spontaneous rupture of extensor tendons, unspecified site
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M66.21
Billable
Spontaneous rupture of extensor tendons, shoulder
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M66.211
Billable
Spontaneous rupture of extensor tendons, right shoulder
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M66.212
Billable
Spontaneous rupture of extensor tendons, left shoulder
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M66.219
Billable
Spontaneous rupture of extensor tendons, unspecified shoulder
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M66.22
Billable
Spontaneous rupture of extensor tendons, upper arm
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M66.221
Billable
Spontaneous rupture of extensor tendons, right upper arm
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M66.222
Billable
Spontaneous rupture of extensor tendons, left upper arm
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M66.229
Billable
Spontaneous rupture of extensor tendons, unspecified upper arm
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M66.23
Billable
Spontaneous rupture of extensor tendons, forearm
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M66.231
Billable
Spontaneous rupture of extensor tendons, right forearm
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M66.232
Billable
Spontaneous rupture of extensor tendons, left forearm
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M66.239
Billable
Spontaneous rupture of extensor tendons, unspecified forearm
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M66.24
Billable
Spontaneous rupture of extensor tendons, hand
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M66.241
Billable
Spontaneous rupture of extensor tendons, right hand
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M66.242
Billable
Spontaneous rupture of extensor tendons, left hand
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M66.249
Billable
Spontaneous rupture of extensor tendons, unspecified hand
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M66.25
Billable
Spontaneous rupture of extensor tendons, thigh
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M66.251
Billable
Spontaneous rupture of extensor tendons, right thigh
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M66.252
Billable
Spontaneous rupture of extensor tendons, left thigh
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M66.259
Billable
Spontaneous rupture of extensor tendons, unspecified thigh
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M66.26
Billable
Spontaneous rupture of extensor tendons, lower leg
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M66.261
Billable
Spontaneous rupture of extensor tendons, right lower leg
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M66.262
Billable
Spontaneous rupture of extensor tendons, left lower leg
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M66.269
Billable
Spontaneous rupture of extensor tendons, unspecified lower leg
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M66.27
Billable
Spontaneous rupture of extensor tendons, ankle and foot
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M66.271
Billable
Spontaneous rupture of extensor tendons, right ankle and foot
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M66.272
Billable
Spontaneous rupture of extensor tendons, left ankle and foot
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M66.279
Billable
Spontaneous rupture of extensor tendons, unspecified ankle and foot
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M66.28
Billable
Spontaneous rupture of extensor tendons, other site
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M66.29
Billable
Spontaneous rupture of extensor tendons, multiple sites
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M66.3
Billable
Spontaneous rupture of flexor tendons
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M66.30
Billable
Spontaneous rupture of flexor tendons, unspecified site
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M66.31
Billable
Spontaneous rupture of flexor tendons, shoulder
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M66.311
Billable
Spontaneous rupture of flexor tendons, right shoulder
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M66.312
Billable
Spontaneous rupture of flexor tendons, left shoulder
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M66.319
Billable
Spontaneous rupture of flexor tendons, unspecified shoulder
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M66.32
Billable
Spontaneous rupture of flexor tendons, upper arm
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M66.321
Billable
Spontaneous rupture of flexor tendons, right upper arm
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M66.322
Billable
Spontaneous rupture of flexor tendons, left upper arm
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M66.329
Billable
Spontaneous rupture of flexor tendons, unspecified upper arm
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M66.33
Billable
Spontaneous rupture of flexor tendons, forearm
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M66.331
Billable
Spontaneous rupture of flexor tendons, right forearm
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M66.332
Billable
Spontaneous rupture of flexor tendons, left forearm
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M66.339
Billable
Spontaneous rupture of flexor tendons, unspecified forearm
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M66.34
Billable
Spontaneous rupture of flexor tendons, hand
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M66.341
Billable
Spontaneous rupture of flexor tendons, right hand
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M66.342
Billable
Spontaneous rupture of flexor tendons, left hand
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M66.349
Billable
Spontaneous rupture of flexor tendons, unspecified hand
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M66.35
Billable
Spontaneous rupture of flexor tendons, thigh
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M66.351
Billable
Spontaneous rupture of flexor tendons, right thigh
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M66.352
Billable
Spontaneous rupture of flexor tendons, left thigh
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M66.359
Billable
Spontaneous rupture of flexor tendons, unspecified thigh
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M66.36
Billable
Spontaneous rupture of flexor tendons, lower leg
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M66.361
Billable
Spontaneous rupture of flexor tendons, right lower leg
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M66.362
Billable
Spontaneous rupture of flexor tendons, left lower leg
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M66.369
Billable
Spontaneous rupture of flexor tendons, unspecified lower leg
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M66.37
Billable
Spontaneous rupture of flexor tendons, ankle and foot
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M66.371
Billable
Spontaneous rupture of flexor tendons, right ankle and foot
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M66.372
Billable
Spontaneous rupture of flexor tendons, left ankle and foot
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M66.379
Billable
Spontaneous rupture of flexor tendons, unspecified ankle and foot
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M66.38
Billable
Spontaneous rupture of flexor tendons, other site
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M66.39
Billable
Spontaneous rupture of flexor tendons, multiple sites
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M66.8
Billable
Spontaneous rupture of other tendons
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M66.80
Billable
Spontaneous rupture of other tendons, unspecified site
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M66.81
Billable
Spontaneous rupture of other tendons, shoulder
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M66.811
Billable
Spontaneous rupture of other tendons, right shoulder
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M66.812
Billable
Spontaneous rupture of other tendons, left shoulder
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M66.819
Billable
Spontaneous rupture of other tendons, unspecified shoulder
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M66.82
Billable
Spontaneous rupture of other tendons, upper arm
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M66.821
Billable
Spontaneous rupture of other tendons, right upper arm
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M66.822
Billable
Spontaneous rupture of other tendons, left upper arm
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M66.829
Billable
Spontaneous rupture of other tendons, unspecified upper arm
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M66.83
Billable
Spontaneous rupture of other tendons, forearm
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M66.831
Billable
Spontaneous rupture of other tendons, right forearm
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M66.832
Billable
Spontaneous rupture of other tendons, left forearm
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M66.839
Billable
Spontaneous rupture of other tendons, unspecified forearm
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M66.84
Billable
Spontaneous rupture of other tendons, hand
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M66.841
Billable
Spontaneous rupture of other tendons, right hand
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M66.842
Billable
Spontaneous rupture of other tendons, left hand
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M66.849
Billable
Spontaneous rupture of other tendons, unspecified hand
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M66.85
Billable
Spontaneous rupture of other tendons, thigh
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M66.851
Billable
Spontaneous rupture of other tendons, right thigh
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M66.852
Billable
Spontaneous rupture of other tendons, left thigh
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M66.859
Billable
Spontaneous rupture of other tendons, unspecified thigh
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M66.86
Billable
Spontaneous rupture of other tendons, lower leg
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M66.861
Billable
Spontaneous rupture of other tendons, right lower leg
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M66.862
Billable
Spontaneous rupture of other tendons, left lower leg
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M66.869
Billable
Spontaneous rupture of other tendons, unspecified lower leg
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M66.87
Billable
Spontaneous rupture of other tendons, ankle and foot
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M66.871
Billable
Spontaneous rupture of other tendons, right ankle and foot
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M66.872
Billable
Spontaneous rupture of other tendons, left ankle and foot
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M66.879
Billable
Spontaneous rupture of other tendons, unspecified ankle and foot
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M66.88
Billable
Spontaneous rupture of other tendons, other sites
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M66.89
Billable
Spontaneous rupture of other tendons, multiple sites
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M66.9
Billable
Spontaneous rupture of unspecified tendon
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M67
Billable
Other disorders of synovium and tendon
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M67.0
Billable
Short Achilles tendon (acquired)
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M67.00
Billable
Short Achilles tendon (acquired), unspecified ankle
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M67.01
Billable
Short Achilles tendon (acquired), right ankle
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M67.02
Billable
Short Achilles tendon (acquired), left ankle
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M67.2
Billable
Synovial hypertrophy, not elsewhere classified
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M67.20
Billable
Synovial hypertrophy, not elsewhere classified, unspecified site
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M67.21
Billable
Synovial hypertrophy, not elsewhere classified, shoulder
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M67.211
Billable
Synovial hypertrophy, not elsewhere classified, right shoulder
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M67.212
Billable
Synovial hypertrophy, not elsewhere classified, left shoulder
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M67.219
Billable
Synovial hypertrophy, not elsewhere classified, unspecified shoulder
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M67.22
Billable
Synovial hypertrophy, not elsewhere classified, upper arm
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M67.221
Billable
Synovial hypertrophy, not elsewhere classified, right upper arm
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M67.222
Billable
Synovial hypertrophy, not elsewhere classified, left upper arm
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M67.229
Billable
Synovial hypertrophy, not elsewhere classified, unspecified upper arm
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M67.23
Billable
Synovial hypertrophy, not elsewhere classified, forearm
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M67.231
Billable
Synovial hypertrophy, not elsewhere classified, right forearm
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M67.232
Billable
Synovial hypertrophy, not elsewhere classified, left forearm
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M67.239
Billable
Synovial hypertrophy, not elsewhere classified, unspecified forearm
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M67.24
Billable
Synovial hypertrophy, not elsewhere classified, hand
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M67.241
Billable
Synovial hypertrophy, not elsewhere classified, right hand
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M67.242
Billable
Synovial hypertrophy, not elsewhere classified, left hand
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M67.249
Billable
Synovial hypertrophy, not elsewhere classified, unspecified hand
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M67.25
Billable
Synovial hypertrophy, not elsewhere classified, thigh
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M67.251
Billable
Synovial hypertrophy, not elsewhere classified, right thigh
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M67.252
Billable
Synovial hypertrophy, not elsewhere classified, left thigh
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M67.259
Billable
Synovial hypertrophy, not elsewhere classified, unspecified thigh
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M67.26
Billable
Synovial hypertrophy, not elsewhere classified, lower leg
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M67.261
Billable
Synovial hypertrophy, not elsewhere classified, right lower leg
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M67.262
Billable
Synovial hypertrophy, not elsewhere classified, left lower leg
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M67.269
Billable
Synovial hypertrophy, not elsewhere classified, unspecified lower leg
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M67.27
Billable
Synovial hypertrophy, not elsewhere classified, ankle and foot
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M67.271
Billable
Synovial hypertrophy, not elsewhere classified, right ankle and foot
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M67.272
Billable
Synovial hypertrophy, not elsewhere classified, left ankle and foot
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M67.279
Billable
Synovial hypertrophy, not elsewhere classified, unspecified ankle and foot
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M67.28
Billable
Synovial hypertrophy, not elsewhere classified, other site
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M67.29
Billable
Synovial hypertrophy, not elsewhere classified, multiple sites
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M67.3
Billable
Transient synovitis
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M67.30
Billable
Transient synovitis, unspecified site
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M67.31
Billable
Transient synovitis, shoulder
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M67.311
Billable
Transient synovitis, right shoulder
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M67.312
Billable
Transient synovitis, left shoulder
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M67.319
Billable
Transient synovitis, unspecified shoulder
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M67.32
Billable
Transient synovitis, elbow
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M67.321
Billable
Transient synovitis, right elbow
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M67.322
Billable
Transient synovitis, left elbow
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M67.329
Billable
Transient synovitis, unspecified elbow
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M67.33
Billable
Transient synovitis, wrist
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M67.331
Billable
Transient synovitis, right wrist
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M67.332
Billable
Transient synovitis, left wrist
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M67.339
Billable
Transient synovitis, unspecified wrist
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M67.34
Billable
Transient synovitis, hand
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M67.341
Billable
Transient synovitis, right hand
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M67.342
Billable
Transient synovitis, left hand
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M67.349
Billable
Transient synovitis, unspecified hand
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M67.35
Billable
Transient synovitis, hip
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M67.351
Billable
Transient synovitis, right hip
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M67.352
Billable
Transient synovitis, left hip
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M67.359
Billable
Transient synovitis, unspecified hip
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M67.36
Billable
Transient synovitis, knee
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M67.361
Billable
Transient synovitis, right knee
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M67.362
Billable
Transient synovitis, left knee
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M67.369
Billable
Transient synovitis, unspecified knee
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M67.37
Billable
Transient synovitis, ankle and foot
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M67.371
Billable
Transient synovitis, right ankle and foot
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Updates & Changes

FY 2026 Updates

Current Year

Deleted Codes

No codes deleted in this range for FY 2026

No significant changes for FY 2026

This range maintains stability with current coding practices

Historical Changes

  • •FY 2025: Routine maintenance updates with minor terminology clarifications
  • •FY 2024: Enhanced specificity requirements for certain code ranges
  • •FY 2023: Updated documentation guidelines for improved clarity

Upcoming Changes

  • •Proposed updates pending review by Coordination and Maintenance Committee
  • •Under consideration: Enhanced digital health integration codes

Implementation Guidance

  • •Review all FY 2026 updates for M65-M67 codes before implementation
  • •Always verify the most current codes in the ICD-10-CM manual
  • •Ensure clinical documentation supports the selected diagnosis codes
  • +3 more guidance items...

Range Overview

high priority

The ICD-10 code range M65-M67 pertains to disorders of the synovium and tendon. This includes conditions such as synovitis, tenosynovitis, and bursitis. These codes are used to document various inflammatory and degenerative conditions affecting the synovium (the lining of the joints) and the tendons. The codes in this range are specific to the location of the disorder and, in some cases, the cause or type of the disorder.

Key Usage Points:

  • •Always specify the location of the disorder for accurate coding.
  • •For conditions like tenosynovitis, specify whether it's acute or chronic.
  • •Use additional codes to identify any associated conditions or complications.
  • •When coding for bursitis, specify the type (e.g., septic or nonseptic).
  • •Remember to code first any associated underlying disease (if applicable).

Coding Guidelines

When to Use:

  • ✓When a patient is diagnosed with synovitis or tenosynovitis.
  • ✓When a patient presents with bursitis, regardless of the type.
  • ✓When a patient has a disorder of the synovium or tendon due to a specific disease (e.g., gout).
  • ✓When a patient has a postprocedural disorder of the synovium or tendon.

When NOT to Use:

  • ✗When the patient's condition is not specifically a disorder of the synovium or tendon.
  • ✗When the disorder is due to an injury or trauma (these are coded elsewhere).
  • ✗When the patient has a disease that affects the synovium or tendon but is not a disorder of these structures.
  • ✗When the patient's condition is a disorder of the muscle or bone, rather than the synovium or tendon.

Code Exclusions

Always verify exclusions with the patient's specific condition and the ICD-10 official guidelines.

Documentation Requirements

Documentation for disorders of the synovium and tendon should include the specific diagnosis, the location of the disorder, and any associated conditions or complications. The type of disorder (e.g., acute, chronic, septic) should also be documented.

Clinical Information:

  • •Specific diagnosis
  • •Location of the disorder
  • •Type of disorder (if applicable)
  • •Associated conditions or complications
  • •Underlying disease (if applicable)

Supporting Evidence:

  • •Clinical examination findings
  • •Imaging results
  • •Lab test results
  • •Patient's medical history
Good Documentation Example:

Patient diagnosed with chronic tenosynovitis of the right wrist due to rheumatoid arthritis. Examination showed swelling and tenderness. Imaging confirmed inflammation of the tendon sheath.

Poor Documentation Example:

Patient has wrist pain.

Common Documentation Errors:

  • âš Not specifying the location of the disorder
  • âš Not documenting the type of disorder
  • âš Not including associated conditions or complications
  • âš Not coding first the underlying disease (if applicable)

Range Statistics

Total Codes
200
Billable
Complexity:
Medium
Primary Use:Clinical Documentation
Chapter:13

Coding Complexity

Medium
Complexity Rating

The complexity of these codes is medium because they require specific information about the type and location of the disorder, as well as any associated conditions or complications. Additionally, any underlying disease must be coded first, if applicable.

Key Factors:
  • â–¸Determining the specific type of disorder
  • â–¸Identifying the exact location of the disorder
  • â–¸Coding any associated conditions or complications
  • â–¸Coding first any underlying disease (if applicable)

Specialty Focus

These codes are commonly used in orthopedics, rheumatology, and sports medicine. They are used to document conditions affecting the joints and tendons, which are common in these specialties.

Primary Specialties:
Orthopedics
40%
Rheumatology
30%
Sports Medicine
30%
Clinical Scenarios:
  • • A patient with rheumatoid arthritis presents with chronic synovitis of the knee.
  • • A patient has acute tenosynovitis of the wrist after a repetitive strain injury.
  • • A patient presents with septic bursitis of the elbow due to an infection.
  • • A patient has a postprocedural disorder of the synovium following knee surgery.

Resources & References

Resources for these codes include the ICD-10 official guidelines, clinical reference materials, and educational resources for coding disorders of the synovium and tendon.

Official Guidelines:

  • ICD-10-CM Official Guidelines for Coding and Reporting
  • American Health Information Management Association (AHIMA) guidelines
  • American Academy of Professional Coders (AAPC) guidelines

Clinical References:

  • American College of Rheumatology guidelines
  • American Academy of Orthopaedic Surgeons guidelines

Educational Materials:

  • AAPC ICD-10 training materials
  • AHIMA ICD-10 coding resources

Frequently Asked Questions

How do I code for a disorder of the synovium or tendon due to a specific disease?

You would code first for the specific disease, followed by the appropriate M65-M67 code to identify the disorder of the synovium or tendon.