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ICD-10 Guide
ICD-10 CodesM21.079

M21.079

Billable

Valgus deformity, not elsewhere classified, unspecified ankle

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

Code Description

ICD-10 M21.079 is a billable code used to indicate a diagnosis of valgus deformity, not elsewhere classified, unspecified ankle.

Key Diagnostic Point:

Valgus deformity refers to a condition where a body part is angled outward away from the midline of the body. In the case of the ankle, this deformity can lead to misalignment and functional impairment. Acquired valgus deformities can arise from various factors, including trauma, arthritis, or degenerative conditions. The most common presentation is hallux valgus, where the big toe deviates laterally, often leading to bunion formation. This condition can cause pain, difficulty in ambulation, and secondary issues in the foot and ankle. Corrective procedures may include osteotomy, arthrodesis, or soft tissue procedures to realign the affected structures. Accurate coding for M21.079 is essential for proper treatment planning and reimbursement, as it captures the complexity of the condition without specifying the underlying cause or associated deformities.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Variability in presentation and severity of the deformity
  • Potential overlap with other foot deformities
  • Need for detailed clinical documentation to support the diagnosis
  • Variations in treatment approaches and surgical interventions

Audit Risk Factors

  • Insufficient documentation of the deformity's severity
  • Lack of clarity on the acquired nature of the deformity
  • Inadequate linkage between diagnosis and treatment
  • Failure to document associated conditions or complications

Specialty Focus

Medical Specialties

Orthopedics

Documentation Requirements

Detailed clinical notes including physical examination findings, imaging results, and treatment plans.

Common Clinical Scenarios

Patients presenting with foot pain, deformity assessment, and surgical consultations.

Billing Considerations

Ensure to document the functional impact of the deformity and any previous treatments.

Podiatry

Documentation Requirements

Comprehensive foot assessments, including gait analysis and patient history.

Common Clinical Scenarios

Management of bunions, flat feet, and other foot deformities.

Billing Considerations

Document any conservative treatments attempted before surgical intervention.

Coding Guidelines

Inclusion Criteria

Use M21.079 When
  • Follow official ICD
  • 10 coding guidelines, ensuring accurate documentation of the condition's acquired nature

Exclusion Criteria

Do NOT use M21.079 When
  • Exclude congenital deformities and ensure that the diagnosis aligns with the treatment provided

Related ICD-10 Codes

Related CPT Codes

28296CPT Code

Osteotomy, first metatarsal

Clinical Scenario

Used in surgical correction of hallux valgus.

Documentation Requirements

Pre-operative assessment, surgical notes, and post-operative follow-up.

Specialty Considerations

Orthopedic surgeons should document the rationale for surgery.

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 valgus deformities, improving the accuracy of clinical data and reimbursement processes.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of conditions like valgus deformities, improving the accuracy of clinical data 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 is the difference between M21.079 and M21.07?

M21.079 is used for unspecified ankle valgus deformities, while M21.07 specifically refers to hallux valgus, which is a more defined condition.