ICD-10 Logo
ICDxICD-10 Medical Coding
ICD-10 Logo
ICDxICD-10 Medical Coding
ICD 10 CodesDiagnoses
ICD 10 CodesDiagnoses
ICD-10 Logo
ICDxICD-10 Medical Coding

Comprehensive ICD-10-CM code reference with AI-powered search capabilities.

© 2025 ICD Code Compass. All rights reserved.

Browse

  • All Chapters
  • All Categories
  • Diagnoses

Tools

  • AI Code Search
ICD-10-CM codes are maintained by the CDC and CMS. This tool is for reference purposes only.
v1.0.0
ICD-10 Guide
ICD-10 CodesM21.0

M21.0

Billable

Valgus deformity, not elsewhere classified

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

Code Description

ICD-10 M21.0 is a billable code used to indicate a diagnosis of valgus deformity, not elsewhere classified.

Key Diagnostic Point:

Valgus deformity refers to a condition where a body part is angled away from the midline of the body. This code specifically addresses acquired valgus deformities that are not classified elsewhere, which can include various abnormalities of the fingers and toes. Commonly, hallux valgus, or bunions, is a prevalent form of this deformity, characterized by lateral deviation of the great toe. Acquired valgus deformities can result from various factors, including trauma, arthritis, or repetitive stress. These deformities can lead to pain, discomfort, and functional limitations, necessitating corrective procedures. Treatment options may include conservative management such as orthotics and physical therapy, or surgical interventions like osteotomy or arthrodesis to realign the affected bones. Accurate coding of this condition is crucial for appropriate treatment planning 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

  • Variety of underlying causes leading to valgus deformities.
  • Differentiation between congenital and acquired forms.
  • Potential for multiple associated conditions (e.g., arthritis).
  • Variability in surgical procedures and their coding.

Audit Risk Factors

  • Inadequate documentation of the deformity's cause.
  • Failure to specify the location of the deformity.
  • Lack of supporting clinical evidence for surgical procedures.
  • Misclassification of congenital versus acquired deformities.

Specialty Focus

Medical Specialties

Orthopedics

Documentation Requirements

Detailed clinical notes on the deformity's etiology, physical examination findings, and treatment plan.

Common Clinical Scenarios

Patients presenting with pain in the foot or hand due to valgus deformities, requiring surgical intervention.

Billing Considerations

Ensure that all surgical procedures are documented with pre-operative and post-operative assessments.

Podiatry

Documentation Requirements

Comprehensive foot examinations, including imaging studies and conservative treatment attempts.

Common Clinical Scenarios

Patients with hallux valgus seeking conservative management or surgical correction.

Billing Considerations

Document the patient's functional limitations and response to conservative treatments.

Coding Guidelines

Inclusion Criteria

Use M21.0 When
  • Follow the official ICD
  • CM coding guidelines, ensuring that the diagnosis is supported by clinical documentation
  • Include details about the location and nature of the deformity, and any associated conditions

Exclusion Criteria

Do NOT use M21.0 When
  • Exclude congenital deformities unless specified as acquired

Related ICD-10 Codes

Related CPT Codes

28296CPT Code

Bunionectomy

Clinical Scenario

Performed for correction of hallux valgus deformity.

Documentation Requirements

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

Specialty Considerations

Orthopedic or podiatric specialties should ensure detailed documentation of the deformity and surgical technique.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of valgus deformities, improving the accuracy of diagnoses and treatment plans. M21.0 provides a broader classification for acquired conditions, which can enhance data collection and analysis.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of valgus deformities, improving the accuracy of diagnoses and treatment plans. M21.0 provides a broader classification for acquired conditions, which can enhance data collection and analysis.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of valgus deformities, improving the accuracy of diagnoses and treatment plans. M21.0 provides a broader classification for acquired conditions, which can enhance data collection and analysis.

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 M21.0 and M20.0?

M21.0 is used for acquired valgus deformities not classified elsewhere, while M20.0 specifically refers to hallux valgus. M21.0 encompasses a broader range of conditions.