ICD-10 Guide

Arthrosis Knee

ICD-10 Coding for Arthrosis of the Knee(M17.0, M17.11, M17.3)

PRIMARY SPECIALTYOrthopedics

COMPLEXITYHigh

LAST UPDATED09/15/2025

Sam Tuffun, PT, DPT

Physical Therapist | Medical Coding & Billing Contributor

Diagnosis Overview

What is Arthrosis Knee?

Essential facts and insights about Arthrosis of the Knee

Key Clinical Considerations:

Patient presents with joint pain, stiffness, and swelling in the knee, particularly after activity.
Radiographic findings may show joint space narrowing, osteophyte formation, and subchondral sclerosis.
Physical examination reveals decreased range of motion, crepitus, and tenderness over the joint line.
MRI may show cartilage loss and bone marrow edema in advanced cases.
Severity can be classified based on the Kellgren-Lawrence grading system, ranging from mild (grade 1) to severe (grade 4).

Clinical Information

Clinical Criteria & Documentation Requirements

Document the patient's history of knee pain, including duration, severity, and impact on daily activities.
Use specific terminology such as 'osteoarthritis' or 'degenerative joint disease' when applicable.
Examples include: 'Patient reports bilateral knee pain with morning stiffness lasting less than 30 minutes.'
Medical necessity must be established through documentation of functional limitations and treatment rationale.
Quality measures may include documentation of pain assessments and functional status evaluations.

Coding Guidelines

Usage Guidelines & Examples

Use M17.0 for bilateral primary arthrosis of the knee when both knees are affected.
Do not use this code for post-traumatic arthritis or inflammatory arthritis, as these have different underlying causes.
M17.11 is for unilateral primary arthrosis of the knee, while M17.3 is for other specified arthrosis.
Common errors include using the wrong laterality or failing to specify the type of arthrosis.
In complex cases, consider the patient's history and any previous diagnoses to select the most accurate code.

Code Exclusions

Important Exclusions

Excludes post-traumatic arthritis (M17.2) and inflammatory arthritis (M05-M06).
Alternative codes for excluded conditions include M17.2 for post-traumatic cases.
Conditions are excluded due to different etiologies and treatment approaches.
Common mistakes include misclassifying post-traumatic arthritis as primary arthrosis.
Related but distinct conditions include patellofemoral pain syndrome (M22.2).

Specialty Focus

Primary Specialty

Orthopedics

Specialty Applications

Applies to patients with osteoarthritis of the knee, particularly older adults.
Patient populations include those over 50 years of age, with a higher prevalence in females.
Clinical settings include outpatient orthopedic clinics and rehabilitation facilities.
Specialty-specific applications are relevant in orthopedics and rheumatology.
Treatment contexts include conservative management, physical therapy, and surgical interventions.

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 arthrosis of the knee based on clinical findings of pain and imaging results.'

Template 2

Template: 'Clinical presentation consistent with knee osteoarthritis including pain and stiffness.'

Template 3

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

Template 4

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

Template 5

Template: 'Follow-up care for knee arthrosis 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?

Detailed documentation of symptoms, physical exam findings, and imaging results is required.

How does this differ from similar diagnoses?

Arthrosis is primarily degenerative, while rheumatoid arthritis is inflammatory and autoimmune.

What are common billing considerations?

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

What procedures are typically associated?

CPT codes for knee arthroscopy (29881) and total knee arthroplasty (27447) may be relevant.

Are there any quality reporting implications?

Quality measures may include tracking functional outcomes and pain management effectiveness.

Arthrosis Knee

Diagnosis Overview

Key Clinical Considerations:

Clinical Information

Clinical Criteria & Documentation Requirements

Coding Guidelines

Usage Guidelines & Examples

Code Exclusions

Important Exclusions

Related ICD-10 Codes

Related CPT Codes

Specialty Focus

Primary Specialty

Specialty Applications

Coding Complexity

Documentation

Documentation Templates

Template 1

Template 2

Template 3

Template 4

Template 5

Billing Information

Billing Considerations

Common Issues

Frequently Asked Questions

What documentation is required for this diagnosis?

How does this differ from similar diagnoses?

What are common billing considerations?

What procedures are typically associated?

Are there any quality reporting implications?

Arthrosis Knee

Diagnosis Overview

Key Clinical Considerations:

Clinical Information

Clinical Criteria & Documentation Requirements

Coding Guidelines

Usage Guidelines & Examples

Code Exclusions

Important Exclusions

Related ICD-10 Codes

Related CPT Codes

Specialty Focus

Primary Specialty

Specialty Applications

Coding Complexity

Documentation

Documentation Templates

Template 1

Template 2

Template 3

Template 4

Template 5

Billing Information

Billing Considerations

Common Issues

Frequently Asked Questions

What documentation is required for this diagnosis?

How does this differ from similar diagnoses?

What are common billing considerations?

What procedures are typically associated?

Are there any quality reporting implications?