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v1.0.0
ICD-10 Guide
DiagnosesArthritis Right Knee

Arthritis Right Knee

ICD-10 Coding for Arthritis of the Right Knee(M17.11, M17.31)

PRIMARY SPECIALTYOrthopedics
COMPLEXITYHigh
LAST UPDATED09/15/2025
Sam Tuffun, PT, DPT
Physical Therapist | Medical Coding & Billing Contributor

Diagnosis Overview

What is Arthritis Right Knee?
Essential facts and insights about Arthritis of the Right Knee

Key Clinical Considerations:

  • Presence of joint pain, swelling, and stiffness in the right knee.
  • Laboratory findings may include elevated inflammatory markers such as ESR or CRP.
  • Physical examination may reveal tenderness, warmth, and decreased range of motion in the right knee.
  • Imaging findings may include joint space narrowing, osteophyte formation, or subchondral sclerosis on X-ray.
  • Severity criteria may include the degree of functional impairment and pain levels assessed using standardized scales.

Clinical Information

Clinical Criteria & Documentation Requirements

  • Medical records must document the patient's history, including onset and duration of symptoms.
  • Specific terminology such as 'osteoarthritis' or 'rheumatoid arthritis' must be clearly stated.
  • Examples include documenting the specific joint affected and the severity of symptoms.
  • Medical necessity must be established through documentation of the impact on daily activities.
  • Quality measures may require documentation of pain assessments and functional status.

Coding Guidelines

Usage Guidelines & Examples

  • Use M17.11 for unilateral primary osteoarthritis of the right knee when symptoms are present.
  • Do not use this code for conditions like post-traumatic arthritis or inflammatory arthritis without proper documentation.
  • M17.31 is used for unilateral secondary osteoarthritis; differentiate based on underlying causes.
  • Common errors include using the wrong laterality or failing to document the type of arthritis.
  • In complex cases, ensure to document all contributing factors and specify the type of arthritis.

Code Exclusions

Important Exclusions

  • Excludes conditions such as post-traumatic arthritis (M17.0) and inflammatory arthritis (M05-M06).
  • Alternative codes for excluded conditions include M17.0 for post-traumatic arthritis.
  • Conditions are excluded due to differing pathophysiology and treatment approaches.
  • Common mistakes include misclassifying post-traumatic arthritis as primary osteoarthritis.
  • Related but distinct conditions include septic arthritis and gout, which require different coding.

Related ICD-10 Codes

Primary Codes
M17.11
Unilateral primary osteoarthritis of the right knee
M17.31
Unilateral secondary osteoarthritis of the right knee
Ancillary Codes
M25.561
Z96.6
Differential Codes
M17.31
M17.31
if there is a history of knee trauma or surgery.
M17.11
M17.11
if there is no history of trauma.

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Orthopedics

Specialty Applications

  • Applies to patients diagnosed with osteoarthritis or rheumatoid arthritis affecting the right knee.
  • Patient populations include adults, particularly those over 50, and individuals with a history of joint injuries.
  • Clinical settings include outpatient orthopedic clinics, rehabilitation centers, and inpatient facilities.
  • Specialty-specific applications are relevant in orthopedics and rheumatology.
  • Treatment contexts include conservative management, surgical interventions, and physical therapy.

Coding Complexity

High Complexity

This diagnosis requires careful attention to:

  • Comprehensive clinical documentation
  • Accurate code selection based on clinical criteria
  • Proper exclusion considerations
  • Specialty-specific coding guidelines

Documentation

Documentation Templates

Template 1

Template: 'Patient diagnosed with osteoarthritis of the right knee based on clinical findings of pain and swelling.'

Template 2

Template: 'Clinical presentation consistent with right knee arthritis including stiffness and limited range of motion.'

Template 3

Template: 'Diagnostic criteria for osteoarthritis met as evidenced by X-ray findings of joint space narrowing.'

Template 4

Template: 'Treatment plan initiated for right knee arthritis with physical therapy and NSAIDs.'

Template 5

Template: 'Follow-up care for right knee osteoarthritis including monitoring of pain levels and mobility.'

Billing Information

Billing Considerations

  • Ensure proper documentation for billing
  • Verify code specificity requirements
  • Check for any additional codes needed
  • Review payer-specific guidelines

Common Issues

  • Insufficient clinical documentation
  • Incorrect code selection
  • Missing supporting diagnoses
  • Timing and frequency documentation

Frequently Asked Questions

What documentation is required for this diagnosis?

Documentation must include patient history, physical exam findings, and imaging results.

How does this differ from similar diagnoses?

Differentiation is based on the type of arthritis and the presence of specific symptoms.

What are common billing considerations?

Ensure accurate coding to reflect the type of arthritis for optimal reimbursement.

What procedures are typically associated?

Commonly associated procedures include joint injections and arthroscopy.

Are there any quality reporting implications?

Quality measures may include tracking pain levels and functional outcomes in patients.