ICD-10 Logo
ICDxICD-10 Medical Coding
ICD-10 Logo
ICDxICD-10 Medical Coding
ICD 10 CodesDiagnoses
ICD 10 CodesDiagnoses
ICD-10 Logo
ICDxICD-10 Medical Coding

Comprehensive ICD-10-CM code reference with AI-powered search capabilities.

© 2025 ICD Code Compass. All rights reserved.

Browse

  • All Chapters
  • All Categories
  • Diagnoses

Tools

  • AI Code Search
ICD-10-CM codes are maintained by the CDC and CMS. This tool is for reference purposes only.
v1.0.0
ICD-10 Guide
ICD-10 CodesM22.4

M22.4

Billable

Chondromalacia patellae

BILLABLE STATUSYes
IMPLEMENTATION DATEOctober 1, 2015
LAST UPDATED09/17/2025

Code Description

ICD-10 M22.4 is a billable code used to indicate a diagnosis of chondromalacia patellae.

Key Diagnostic Point:

Chondromalacia patellae refers to the softening and breakdown of the cartilage on the underside of the kneecap (patella). This condition is often associated with knee pain, particularly in young athletes and individuals who engage in activities that put stress on the knee joint. The primary symptom is anterior knee pain, which may worsen with activities such as climbing stairs, squatting, or sitting for prolonged periods. The condition can result from overuse, misalignment of the patella, or previous knee injuries. Diagnosis typically involves a physical examination, patient history, and imaging studies such as MRI or X-rays to assess cartilage integrity. Treatment options may include physical therapy, anti-inflammatory medications, and in some cases, arthroscopic surgery to repair or smooth the damaged cartilage. Understanding the underlying causes and appropriate management strategies is crucial for effective treatment and recovery.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Differentiating between chondromalacia and other knee conditions such as meniscal tears or ligament injuries.
  • The need for detailed documentation of symptoms and imaging results.
  • Variability in treatment approaches, including conservative versus surgical options.
  • Potential for co-existing conditions that may complicate coding.

Audit Risk Factors

  • Inadequate documentation of the patient's history and physical examination findings.
  • Failure to specify the severity or extent of cartilage damage.
  • Incorrect linkage of the diagnosis to the procedure performed.
  • Lack of imaging studies to support the diagnosis.

Specialty Focus

Medical Specialties

Orthopedics

Documentation Requirements

Detailed notes on physical examination findings, imaging results, and treatment plans.

Common Clinical Scenarios

Patients presenting with knee pain, particularly athletes or active individuals.

Billing Considerations

Documentation should clearly outline the relationship between symptoms and functional limitations.

Physical Therapy

Documentation Requirements

Progress notes detailing treatment interventions, patient response, and functional improvements.

Common Clinical Scenarios

Patients undergoing rehabilitation for knee pain related to chondromalacia.

Billing Considerations

Therapists should document specific exercises and their impact on pain and mobility.

Coding Guidelines

Inclusion Criteria

Use M22.4 When
  • According to ICD
  • 10 guidelines, M22
  • 4 should be used when there is clear documentation of chondromalacia patellae
  • It is important to include any relevant imaging studies and treatment plans in the medical record to support the diagnosis

Exclusion Criteria

Do NOT use M22.4 When
  • Exclusion criteria include conditions that may mimic chondromalacia, such as osteoarthritis or patellar tendinopathy

Related ICD-10 Codes

Related CPT Codes

29881CPT Code

Arthroscopy, knee, surgical; with chondroplasty

Clinical Scenario

Used when performing arthroscopic surgery to repair damaged cartilage.

Documentation Requirements

Operative report detailing the procedure and findings.

Specialty Considerations

Orthopedic surgeons should ensure that the diagnosis aligns with the surgical procedure performed.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of chondromalacia patellae, improving the accuracy of diagnosis and treatment tracking. This specificity aids in better patient management and resource allocation.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of chondromalacia patellae, improving the accuracy of diagnosis and treatment tracking. This specificity aids in better patient management and resource allocation.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of chondromalacia patellae, improving the accuracy of diagnosis and treatment tracking. This specificity aids in better patient management and resource allocation.

Resources

Clinical References

  • •
    ICD-10-CM Official Guidelines for Coding and Reporting

Coding & Billing References

  • •
    ICD-10-CM Official Guidelines for Coding and Reporting

Frequently Asked Questions

What are the common symptoms of chondromalacia patellae?

Common symptoms include anterior knee pain, swelling, and a feeling of grinding or clicking in the knee during movement.

How is chondromalacia patellae diagnosed?

Diagnosis is typically made through a combination of patient history, physical examination, and imaging studies such as MRI or X-rays.

What treatment options are available for chondromalacia patellae?

Treatment options include physical therapy, anti-inflammatory medications, and in some cases, arthroscopic surgery to repair or smooth the damaged cartilage.