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ICD-10 Guide
ICD-10 CodesM21.07

M21.07

Billable

Valgus deformity, not elsewhere classified, ankle

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

Code Description

ICD-10 M21.07 is a billable code used to indicate a diagnosis of valgus deformity, not elsewhere classified, ankle.

Key Diagnostic Point:

Valgus deformity of the ankle is characterized by an abnormal angulation of the ankle joint, where the foot deviates laterally relative to the leg. This condition can be acquired due to various factors, including trauma, arthritis, or repetitive stress injuries. Acquired valgus deformities often result from conditions such as obesity, which increases stress on the joints, or from previous surgical interventions that may alter the normal alignment of the ankle. The deformity can lead to significant functional impairment, pain, and difficulty in ambulation. Patients may also experience secondary complications such as osteoarthritis due to abnormal joint mechanics. Hallux valgus, a related condition, involves a lateral deviation of the big toe and can also contribute to the development of ankle valgus deformities. Corrective procedures may include osteotomy, arthrodesis, or soft tissue procedures aimed at realigning the joint and restoring normal function. Accurate coding of this condition is essential for appropriate treatment planning and reimbursement.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Variability in clinical presentation and severity of the deformity
  • Differentiation from other types of deformities (e.g., varus)
  • Need for detailed documentation of the underlying cause
  • Potential for co-existing conditions affecting the ankle

Audit Risk Factors

  • Inadequate documentation of the deformity's acquired nature
  • Failure to specify the severity of the deformity
  • Lack of clarity regarding associated conditions
  • Improper linkage between diagnosis and treatment codes

Specialty Focus

Medical Specialties

Orthopedic Surgery

Documentation Requirements

Detailed clinical notes describing the deformity, treatment plan, and any imaging studies.

Common Clinical Scenarios

Patients presenting with pain and instability in the ankle due to valgus deformity.

Billing Considerations

Ensure that the documentation specifies whether the deformity is congenital or acquired.

Podiatry

Documentation Requirements

Foot examination findings, including alignment and range of motion assessments.

Common Clinical Scenarios

Patients with hallux valgus and associated ankle deformities seeking conservative or surgical management.

Billing Considerations

Document any conservative treatments attempted prior to surgical intervention.

Coding Guidelines

Inclusion Criteria

Use M21.07 When
  • According to ICD
  • 10 guidelines, M21
  • 07 should be used when the valgus deformity is not classified elsewhere
  • Coders must ensure that the documentation supports the diagnosis and that it is not a result of a congenital condition or other specified deformities

Exclusion Criteria

Do NOT use M21.07 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

28300CPT Code

Osteotomy, metatarsal, for hallux valgus

Clinical Scenario

Used in conjunction with M21.07 when surgical correction of the deformity is performed.

Documentation Requirements

Operative reports detailing the procedure and indication for surgery.

Specialty Considerations

Orthopedic surgeons must document the rationale for surgical intervention.

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 M21.07, improving the accuracy of diagnoses and treatment plans. This specificity aids in better tracking of outcomes and resource allocation.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of conditions like M21.07, improving the accuracy of diagnoses and treatment plans. This specificity aids in better tracking of outcomes and resource allocation.

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

What is the primary cause of acquired valgus deformity?

Acquired valgus deformity can result from various factors, including trauma, obesity, and degenerative joint diseases, which alter the normal alignment of the ankle.