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ICD-10 Guide
ICD-10 CodesM21.242

M21.242

Billable

Flexion deformity, left finger joints

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

Code Description

ICD-10 M21.242 is a billable code used to indicate a diagnosis of flexion deformity, left finger joints.

Key Diagnostic Point:

Flexion deformity of the left finger joints refers to a condition where one or more joints in the fingers are bent in a flexed position, limiting the ability to extend the fingers fully. This acquired deformity can result from various factors, including trauma, arthritis, or neurological conditions. Patients may experience pain, reduced range of motion, and functional impairment, affecting daily activities such as gripping or holding objects. The condition can be unilateral, as indicated by the 'left' specification, and may vary in severity from mild to severe. Treatment options often include physical therapy, splinting, or surgical intervention to correct the deformity and restore function. Understanding the underlying cause is crucial for effective management and coding, as it may influence the choice of treatment and the associated procedures.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Differentiating between acquired and congenital deformities
  • Identifying the specific joints affected
  • Documenting the severity and functional impact
  • Understanding associated conditions like arthritis or neurological disorders

Audit Risk Factors

  • Inadequate documentation of the deformity's cause
  • Failure to specify laterality
  • Lack of supporting clinical evidence for the diagnosis
  • Incorrect linkage to treatment codes

Specialty Focus

Medical Specialties

Orthopedics

Documentation Requirements

Detailed clinical notes on the deformity's cause, severity, and treatment plan.

Common Clinical Scenarios

Patients with post-traumatic flexion deformities or those with degenerative joint diseases.

Billing Considerations

Ensure to document any previous surgeries or treatments that may affect the current condition.

Physical Medicine and Rehabilitation

Documentation Requirements

Functional assessments and treatment goals related to the patient's ability to perform daily activities.

Common Clinical Scenarios

Patients undergoing rehabilitation post-injury or surgery to improve finger function.

Billing Considerations

Document the patient's progress and response to therapy to support ongoing treatment.

Coding Guidelines

Inclusion Criteria

Use M21.242 When
  • Follow official ICD
  • CM coding guidelines, ensuring accurate documentation of the condition's cause and laterality
  • Include any relevant history that may affect treatment decisions

Exclusion Criteria

Do NOT use M21.242 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

26340CPT Code

Tenotomy, finger flexor tendon

Clinical Scenario

Used when surgical intervention is required to correct the flexion deformity.

Documentation Requirements

Surgical notes detailing the procedure and indication for surgery.

Specialty Considerations

Orthopedic surgeons should document the specific joints involved and the extent of the deformity.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of conditions like flexion deformities, improving the accuracy of patient records and treatment plans.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of conditions like flexion deformities, improving the accuracy of patient records and treatment plans.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of conditions like flexion deformities, improving the accuracy of patient records and treatment plans.

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 is the difference between acquired and congenital flexion deformities?

Acquired flexion deformities develop due to injury, disease, or other external factors, while congenital deformities are present at birth and result from genetic or developmental issues.