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ICD-10 Guide
ICD-10 CodesM61.11

M61.11

Billable

Myositis ossificans progressiva, shoulder

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

Code Description

ICD-10 M61.11 is a billable code used to indicate a diagnosis of myositis ossificans progressiva, shoulder.

Key Diagnostic Point:

Myositis ossificans progressiva (MOP) is a rare genetic disorder characterized by the abnormal formation of bone in muscles, tendons, and other connective tissues. This condition typically presents with progressive muscle weakness and stiffness, particularly affecting the shoulder region. Patients may experience painful swelling and limited range of motion due to the ossification process, which can lead to significant functional impairment. The onset of symptoms often occurs in childhood or early adulthood, and the condition is associated with mutations in the ACVR1 gene, which plays a crucial role in bone and muscle development. Diagnosis is primarily clinical, supported by imaging studies that reveal heterotopic ossification. Management focuses on symptomatic relief and physical therapy, as surgical intervention is often complicated by the risk of further ossification. Understanding the nuances of myositis ossificans progressiva is essential for accurate coding and appropriate patient management.

Code Complexity Analysis

Complexity Rating: High

High Complexity

Complexity Factors

  • Rare condition with limited awareness among healthcare providers
  • Need for precise documentation of symptoms and progression
  • Differentiation from other forms of myositis and ossification disorders
  • Potential for misdiagnosis due to overlapping symptoms with other neuromuscular conditions

Audit Risk Factors

  • Insufficient documentation of clinical findings
  • Lack of genetic testing results in the medical record
  • Inconsistent use of terminology related to muscle disorders
  • Failure to document the progression of symptoms

Specialty Focus

Medical Specialties

Rheumatology

Documentation Requirements

Detailed history of symptoms, physical examination findings, and imaging results.

Common Clinical Scenarios

Patients presenting with unexplained muscle pain and stiffness, particularly in the shoulder.

Billing Considerations

Documentation should include family history and any genetic testing performed.

Genetics

Documentation Requirements

Genetic testing results, family pedigree, and clinical evaluation.

Common Clinical Scenarios

Patients with a family history of myositis ossificans or unexplained ossification.

Billing Considerations

Ensure that genetic counseling notes are included in the medical record.

Coding Guidelines

Inclusion Criteria

Use M61.11 When
  • Follow ICD
  • CM guidelines for coding myositis and related conditions
  • Ensure accurate documentation of the site of ossification and any associated symptoms

Exclusion Criteria

Do NOT use M61.11 When
  • Exclude other conditions that may mimic MOP

Related ICD-10 Codes

Related CPT Codes

20610CPT Code

Arthrocentesis, aspiration and/or injection into a major joint or bursa

Clinical Scenario

Used when a patient with MOP requires aspiration of a swollen shoulder joint.

Documentation Requirements

Document the reason for the procedure and any findings during the aspiration.

Specialty Considerations

Rheumatology may require additional details on joint function and pain levels.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of myositis ossificans progressiva, improving the accuracy of data collection and patient management.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of myositis ossificans progressiva, improving the accuracy of data collection and patient management.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of myositis ossificans progressiva, improving the accuracy of data collection and patient management.

Resources

Clinical References

  • •
    Myositis Association

Coding & Billing References

  • •
    Myositis Association

Frequently Asked Questions

What are the common symptoms of myositis ossificans progressiva?

Common symptoms include progressive muscle stiffness, pain, swelling, and limited range of motion, particularly in the affected areas.