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ICD-10 Guide
ICD-10 CodesM21.629

M21.629

Billable

Bunionette of unspecified foot

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

Code Description

ICD-10 M21.629 is a billable code used to indicate a diagnosis of bunionette of unspecified foot.

Key Diagnostic Point:

A bunionette, also known as a tailor's bunion, is a bony prominence that occurs at the base of the fifth toe, resulting from the misalignment of the toe joint. This acquired deformity is characterized by lateral deviation of the fifth toe and can lead to pain, swelling, and discomfort, particularly when wearing tight or ill-fitting shoes. The condition often arises due to genetic predisposition, footwear choices, or repetitive stress on the foot. Patients may experience symptoms such as localized pain, redness, and inflammation around the affected area. The bunionette can be associated with other foot deformities, including hallux valgus, where the big toe deviates towards the second toe. Treatment options vary from conservative measures, such as orthotics and padding, to surgical interventions aimed at realigning the toe and alleviating pain. Corrective procedures may include osteotomy, exostectomy, or arthrodesis, depending on the severity of the deformity and the patient's overall foot structure. Accurate diagnosis and coding are essential for effective treatment planning and reimbursement.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Variability in clinical presentation and severity of the condition
  • Potential overlap with other foot deformities like hallux valgus
  • Need for precise documentation of symptoms and treatment plans
  • Variations in surgical procedures and their coding

Audit Risk Factors

  • Inadequate documentation of symptoms and treatment
  • Failure to specify laterality when applicable
  • Misclassification of bunionette as hallux valgus
  • Lack of supporting evidence for surgical procedures

Specialty Focus

Medical Specialties

Podiatry

Documentation Requirements

Detailed clinical notes including patient history, physical examination findings, and treatment plans.

Common Clinical Scenarios

Patients presenting with foot pain, deformities, or complications from bunionettes.

Billing Considerations

Ensure clear documentation of the relationship between bunionette and other foot deformities.

Orthopedics

Documentation Requirements

Comprehensive evaluation reports, imaging studies, and surgical notes.

Common Clinical Scenarios

Patients requiring surgical intervention for bunionette correction.

Billing Considerations

Document the rationale for surgical procedures and any pre-existing conditions.

Coding Guidelines

Inclusion Criteria

Use M21.629 When
  • Follow the official ICD
  • CM guidelines for coding acquired deformities
  • Ensure accurate documentation of the condition's severity and any associated symptoms

Exclusion Criteria

Do NOT use M21.629 When
  • Exclude conditions that may mimic or complicate the diagnosis

Related ICD-10 Codes

Related CPT Codes

28299CPT Code

Osteotomy, metatarsal, for bunionette

Clinical Scenario

Used when surgical correction of a bunionette is performed.

Documentation Requirements

Surgical notes detailing the procedure, indications, and postoperative care.

Specialty Considerations

Podiatrists and orthopedic surgeons should ensure clear documentation of the surgical approach.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of foot deformities, including bunionettes. This specificity aids in better tracking of treatment outcomes and resource allocation.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of foot deformities, including bunionettes. This specificity aids in better tracking of treatment outcomes and resource allocation.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of foot deformities, including bunionettes. This specificity aids in better tracking of treatment outcomes and resource allocation.

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 a bunionette and a bunion?

A bunionette occurs at the base of the fifth toe, while a bunion occurs at the base of the big toe. Both are bony prominences but affect different areas of the foot.