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v1.0.0
ICD-10 Guide
ICD-10 CodesM61.539

M61.539

Billable

Other ossification of muscle, unspecified forearm

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

Code Description

ICD-10 M61.539 is a billable code used to indicate a diagnosis of other ossification of muscle, unspecified forearm.

Key Diagnostic Point:

M61.539 refers to a condition characterized by abnormal ossification or calcification of muscle tissue in the forearm, which is not classified under more specific ossification disorders. This condition can arise from various etiologies, including trauma, chronic inflammation, or myositis, leading to muscle stiffness, pain, and functional impairment. Patients may experience muscle weakness and reduced range of motion due to the ossification process, which can interfere with normal muscle function. The condition may be associated with neuromuscular disorders, where muscle tissue undergoes pathological changes due to underlying systemic issues. Diagnosis typically involves imaging studies such as X-rays or MRI to visualize the ossified areas and differentiate them from other muscle disorders. Treatment may include physical therapy, pain management, and in some cases, surgical intervention to remove the ossified tissue if it significantly impacts function.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Variability in clinical presentation and underlying causes
  • Need for precise documentation of symptoms and imaging findings
  • Differentiation from other muscle disorders and ossification conditions
  • Potential for co-existing neuromuscular conditions

Audit Risk Factors

  • Inadequate documentation of clinical findings
  • Failure to specify the site of ossification
  • Misdiagnosis or coding of related muscle disorders
  • Lack of imaging studies to support the diagnosis

Specialty Focus

Medical Specialties

Orthopedics

Documentation Requirements

Detailed clinical notes, imaging reports, and treatment plans.

Common Clinical Scenarios

Patients presenting with forearm pain and stiffness post-injury or with a history of myositis.

Billing Considerations

Ensure clear documentation of the extent of ossification and its impact on function.

Neurology

Documentation Requirements

Comprehensive neurological assessments and history of neuromuscular symptoms.

Common Clinical Scenarios

Patients with muscle weakness and unexplained forearm stiffness.

Billing Considerations

Document any underlying neuromuscular disorders that may contribute to the condition.

Coding Guidelines

Inclusion Criteria

Use M61.539 When
  • Follow official ICD
  • CM guidelines for coding muscle disorders, ensuring specificity in documentation
  • Include details on the location and nature of ossification, and consider any associated conditions

Exclusion Criteria

Do NOT use M61.539 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

20610CPT Code

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

Clinical Scenario

Used when joint aspiration is needed due to associated pain.

Documentation Requirements

Document the reason for aspiration and findings.

Specialty Considerations

Orthopedic specialists may frequently perform this procedure.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of muscle ossification conditions, improving the accuracy of data collection and reimbursement processes.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of muscle ossification conditions, improving the accuracy of data collection and reimbursement processes.

Reimbursement & Billing Impact

reimbursement processes.

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 associated with M61.539?

Common symptoms include pain, stiffness, and reduced range of motion in the forearm, often accompanied by muscle weakness.