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v1.0.0
ICD-10 Guide
ICD-10 CodesM21.949

M21.949

Billable

Unspecified acquired deformity of hand, unspecified hand

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

Code Description

ICD-10 M21.949 is a billable code used to indicate a diagnosis of unspecified acquired deformity of hand, unspecified hand.

Key Diagnostic Point:

M21.949 refers to an unspecified acquired deformity of the hand, which can arise from various causes such as trauma, infection, or degenerative diseases. Acquired deformities may manifest as changes in the shape or structure of the hand, affecting functionality and aesthetics. Common examples include conditions like Dupuytren's contracture, where the fingers bend towards the palm, or post-traumatic deformities resulting from fractures or dislocations. These deformities can lead to significant impairment in hand function, impacting daily activities and quality of life. Treatment options may vary widely, ranging from conservative management, such as splinting and physical therapy, to surgical interventions aimed at correcting the deformity. Accurate coding is essential for appropriate reimbursement and to reflect the complexity of the patient's condition, especially when the specific nature of the deformity is not clearly defined in the documentation.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Variability in documentation quality regarding the nature of the deformity
  • Need for precise clinical details to differentiate from other hand conditions
  • Potential overlap with other codes for specific deformities
  • Variability in treatment approaches and their documentation

Audit Risk Factors

  • Insufficient documentation to support the diagnosis
  • Inconsistent terminology used in clinical notes
  • Failure to specify the type of acquired deformity
  • Lack of follow-up documentation on treatment outcomes

Specialty Focus

Medical Specialties

Orthopedic Surgery

Documentation Requirements

Detailed descriptions of the deformity, treatment plans, and outcomes.

Common Clinical Scenarios

Patients presenting with post-traumatic deformities or degenerative changes in the hand.

Billing Considerations

Ensure that all surgical interventions and their indications are well-documented.

Physical Medicine and Rehabilitation

Documentation Requirements

Functional assessments and treatment plans focusing on rehabilitation.

Common Clinical Scenarios

Patients requiring therapy for hand function restoration post-injury.

Billing Considerations

Documenting the impact of the deformity on daily living activities is crucial.

Coding Guidelines

Inclusion Criteria

Use M21.949 When
  • According to ICD
  • CM guidelines, M21
  • 949 should be used when the specific type of acquired deformity is not documented
  • Coders should ensure that the documentation supports the use of this code and consider more specific codes if available

Exclusion Criteria

Do NOT use M21.949 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

26160CPT Code

Excision of a benign tumor of the hand

Clinical Scenario

Used when a benign tumor is causing an acquired deformity.

Documentation Requirements

Document the indication for surgery and the type of deformity.

Specialty Considerations

Orthopedic surgeons should provide detailed operative notes.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specificity in coding, but M21.949 remains a catch-all for unspecified acquired deformities, which can complicate data analysis and reimbursement.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specificity in coding, but M21.949 remains a catch-all for unspecified acquired deformities, which can complicate data analysis and reimbursement.

Reimbursement & Billing Impact

reimbursement.

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

When should I use M21.949?

Use M21.949 when the documentation indicates an acquired deformity of the hand but does not specify the type or nature of the deformity.