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ICD-10 Guide
ICD-10 CodesM21.179

M21.179

Billable

Varus deformity, not elsewhere classified, unspecified ankle

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

Code Description

ICD-10 M21.179 is a billable code used to indicate a diagnosis of varus deformity, not elsewhere classified, unspecified ankle.

Key Diagnostic Point:

Varus deformity of the ankle is characterized by an inward angulation of the distal segment of a bone or joint, leading to a misalignment that can affect gait and overall mobility. This condition can be acquired due to various factors, including trauma, degenerative diseases, or post-surgical changes. Patients may present with symptoms such as pain, instability, and difficulty in weight-bearing activities. The deformity can lead to secondary complications, including arthritis or further joint degeneration if left untreated. Treatment options may include physical therapy, orthotic devices, or surgical interventions aimed at correcting the alignment. Corrective procedures may involve osteotomy or arthrodesis, depending on the severity and underlying cause of the deformity. Accurate coding is essential for proper management and reimbursement, as it reflects the complexity of the patient's condition and the interventions required.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Variability in presentation and severity of the deformity
  • Need for detailed documentation of the underlying cause
  • Potential for co-existing conditions affecting the ankle
  • Variations in treatment approaches and their documentation

Audit Risk Factors

  • Inadequate documentation of the deformity's severity
  • Failure to specify the acquired nature of the deformity
  • Lack of clarity on treatment plans and outcomes
  • Misclassification with other deformities

Specialty Focus

Medical Specialties

Orthopedics

Documentation Requirements

Detailed clinical notes on the deformity's nature, treatment plans, and outcomes.

Common Clinical Scenarios

Patients presenting with ankle pain and deformity post-trauma or surgery.

Billing Considerations

Ensure to document any prior treatments or interventions that may have contributed to the deformity.

Physical Therapy

Documentation Requirements

Progress notes detailing functional limitations and response to therapy.

Common Clinical Scenarios

Patients undergoing rehabilitation for varus deformity post-surgery.

Billing Considerations

Document specific exercises and their impact on the patient's mobility.

Coding Guidelines

Inclusion Criteria

Use M21.179 When
  • According to ICD
  • 10 guidelines, M21
  • 179 should be used when the varus deformity is not classified elsewhere and is unspecified
  • Coders must ensure that the documentation supports the diagnosis and that it is not a result of a more specific condition

Exclusion Criteria

Do NOT use M21.179 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

28300CPT Code

Osteotomy, tibia or fibula

Clinical Scenario

Used in cases where surgical correction of the varus deformity is indicated.

Documentation Requirements

Surgical notes detailing the procedure and rationale for correction.

Specialty Considerations

Orthopedic surgeons must document pre-operative assessments and post-operative outcomes.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of varus deformities, improving the accuracy of patient records and facilitating better management strategies.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of varus deformities, improving the accuracy of patient records and facilitating better management strategies.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of varus deformities, improving the accuracy of patient records and facilitating better management strategies.

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 significance of coding M21.179 accurately?

Accurate coding of M21.179 is crucial for appropriate reimbursement, ensuring that the complexity of the patient's condition is recognized and that the treatment provided is justified.