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ICD-10 Guide
ICD-10 CodesM21.939

M21.939

Billable

Unspecified acquired deformity of unspecified forearm

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

Code Description

ICD-10 M21.939 is a billable code used to indicate a diagnosis of unspecified acquired deformity of unspecified forearm.

Key Diagnostic Point:

M21.939 refers to an unspecified acquired deformity of the forearm, which can arise from various causes such as trauma, infection, or underlying medical conditions. Acquired deformities may manifest as changes in bone structure, joint alignment, or soft tissue integrity, leading to functional impairment or aesthetic concerns. Common examples include malunion or nonunion of fractures, post-surgical changes, or deformities resulting from conditions like rheumatoid arthritis. The forearm consists of two long bones, the radius and ulna, and deformities can affect one or both. Clinical evaluation typically involves physical examination and imaging studies to assess the extent of the deformity and its impact on function. Treatment may vary widely, from conservative management with splints and physical therapy to surgical interventions aimed at correcting the deformity and restoring function. Accurate coding is essential for appropriate reimbursement and to reflect the complexity of the patient's condition.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Variability in documentation of acquired deformities
  • Need for precise anatomical localization
  • Differentiation from congenital deformities
  • Potential for multiple underlying causes

Audit Risk Factors

  • Insufficient documentation of the deformity's cause
  • Lack of detailed clinical notes on treatment plans
  • Inconsistent use of terminology in medical records
  • Failure to document functional limitations

Specialty Focus

Medical Specialties

Orthopedics

Documentation Requirements

Detailed descriptions of the deformity, imaging results, and treatment plans.

Common Clinical Scenarios

Post-fracture deformities, post-surgical complications, and degenerative changes.

Billing Considerations

Ensure that all relevant imaging and functional assessments are documented to support the diagnosis.

Physical Medicine and Rehabilitation

Documentation Requirements

Functional assessments, treatment goals, and progress notes.

Common Clinical Scenarios

Rehabilitation following corrective surgery or management of chronic deformities.

Billing Considerations

Documenting the impact of the deformity on daily activities and quality of life is crucial.

Coding Guidelines

Inclusion Criteria

Use M21.939 When
  • Follow the official ICD
  • CM coding guidelines, ensuring that the code is used only when the specific nature of the deformity is not documented
  • Include any relevant details about the patient's history and the deformity's impact on function

Exclusion Criteria

Do NOT use M21.939 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

25447CPT Code

Osteotomy, forearm

Clinical Scenario

Used in cases of significant deformity requiring surgical correction.

Documentation Requirements

Operative report detailing the procedure and indications.

Specialty Considerations

Orthopedic specialists should ensure comprehensive documentation of pre-operative assessments.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of acquired deformities, improving the granularity of data collected for treatment outcomes and reimbursement. M21.939 provides a broad category for unspecified deformities, which can lead to challenges in capturing the complexity of patient conditions.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of acquired deformities, improving the granularity of data collected for treatment outcomes and reimbursement. M21.939 provides a broad category for unspecified deformities, which can lead to challenges in capturing the complexity of patient conditions.

Reimbursement & Billing Impact

reimbursement. M21.939 provides a broad category for unspecified deformities, which can lead to challenges in capturing the complexity of patient conditions.

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 should I document to support the use of M21.939?

Document the specific nature of the deformity, its cause, any functional limitations, and the treatment plan. Include imaging studies and clinical assessments to provide a comprehensive view of the patient's condition.