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ICD-10 Guide
DiagnosesArthritis Of Right Knee

Arthritis Of Right Knee

ICD-10 Coding for Arthritis of 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 Of Right Knee?
Essential facts and insights about Arthritis of Right Knee

Key Clinical Considerations:

  • Patient presents with joint pain, swelling, and stiffness in the right knee, particularly after periods of inactivity.
  • Laboratory findings may include elevated inflammatory markers such as ESR or CRP, but are not definitive for diagnosis.
  • Physical examination reveals tenderness, decreased range of motion, and crepitus in the right knee joint.
  • Imaging studies, such as X-rays or MRI, may show joint space narrowing, osteophyte formation, or subchondral sclerosis.
  • Severity criteria may include the degree of functional impairment and pain levels, often assessed using scales like the WOMAC or VAS.

Clinical Information

Clinical Criteria & Documentation Requirements

  • Medical records must include a clear diagnosis of arthritis of the right knee, supported by clinical findings.
  • Specific terminology such as 'osteoarthritis' or 'rheumatoid arthritis' must be documented to specify the type of arthritis.
  • Examples include documenting the patient's pain level, functional limitations, and response to previous treatments.
  • Medical necessity must be established through documentation of symptoms, treatment plans, and expected outcomes.
  • Quality measures may require documentation of pain assessments, functional status evaluations, and treatment effectiveness.

Coding Guidelines

Usage Guidelines & Examples

  • Use M17.11 for unilateral primary osteoarthritis of the right knee when the condition is confirmed and documented.
  • Do not use this code for conditions such as post-traumatic arthritis or arthritis affecting multiple joints.
  • M17.31 is used for unilateral secondary osteoarthritis of the right knee; differentiate based on underlying causes.
  • Common errors include using the wrong laterality or failing to specify the type of arthritis; always verify documentation.
  • In complex cases, consider the patient's history and comorbidities to select the most accurate code.

Code Exclusions

Important Exclusions

  • Excludes post-traumatic arthritis, which is coded separately (e.g., M17.9 for unspecified knee arthritis).
  • Alternative codes for excluded conditions include M06 for other inflammatory arthritis types.
  • Conditions are excluded to ensure accurate representation of the patient's specific diagnosis and treatment needs.
  • Common mistakes include misclassifying post-traumatic arthritis as primary osteoarthritis; verify patient history.
  • Related but distinct conditions include septic arthritis and reactive arthritis, which require different management.

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
S83.511D
Differential Codes
M17.31
M17.11

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.
  • Common in older adults, but can also affect younger individuals with risk factors such as obesity or previous knee injuries.
  • Clinical settings include outpatient orthopedic clinics, rehabilitation facilities, and inpatient settings for severe cases.
  • Specialty-specific applications are relevant in orthopedics, rheumatology, and physical medicine.
  • 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 arthritis of the right knee based on clinical findings of pain and swelling.'

Template 2

Template: 'Clinical presentation consistent with osteoarthritis including stiffness and decreased range of motion.'

Template 3

Template: 'Diagnostic criteria for osteoarthritis met as evidenced by imaging 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 arthritis including monitoring of pain levels and functional status.'

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 clinical findings, patient history, and treatment plans.

How does this differ from similar diagnoses?

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

What are common billing considerations?

Ensure that the diagnosis aligns with the services provided to optimize reimbursement.

What procedures are typically associated?

Commonly associated CPT codes include joint injections, physical therapy, and arthroscopy.

Are there any quality reporting implications?

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