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v1.0.0
ICD-10 Guide
ICD-10 CodesM21.80

M21.80

Billable

Other specified acquired deformities of unspecified limb

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

Code Description

ICD-10 M21.80 is a billable code used to indicate a diagnosis of other specified acquired deformities of unspecified limb.

Key Diagnostic Point:

M21.80 refers to acquired deformities of the limbs that do not fall under more specific categories. These deformities can arise from various causes, including trauma, infections, or conditions that lead to structural changes in the bones and soft tissues. Common examples include finger and toe abnormalities such as syndactyly, polydactyly, and hallux valgus. Hallux valgus, characterized by a lateral deviation of the big toe, can lead to significant discomfort and functional impairment. Corrective procedures may include surgical interventions such as osteotomy or arthrodesis to realign the affected digit. Accurate coding requires a thorough understanding of the patient's history and the specific nature of the deformity, as well as any associated conditions that may influence treatment options.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Variety of potential underlying causes for acquired deformities
  • Need for detailed clinical documentation to specify the type of deformity
  • Differentiation from congenital deformities and other related codes
  • Potential for multiple deformities in a single patient

Audit Risk Factors

  • Insufficient documentation of the deformity's specifics
  • Inconsistent coding of related conditions
  • Failure to document the treatment plan or corrective procedures
  • Lack of clarity on the acquired nature of the deformity

Specialty Focus

Medical Specialties

Orthopedics

Documentation Requirements

Detailed descriptions of the deformity, treatment plans, and any imaging studies.

Common Clinical Scenarios

Patients presenting with acquired deformities following trauma or surgery.

Billing Considerations

Ensure that the documentation clearly states the acquired nature of the deformity and any associated conditions.

Podiatry

Documentation Requirements

Foot examination findings, patient history, and treatment options.

Common Clinical Scenarios

Patients with hallux valgus or other toe deformities requiring surgical intervention.

Billing Considerations

Document the functional impact of the deformity on the patient's mobility.

Coding Guidelines

Inclusion Criteria

Use M21.80 When
  • Follow the official ICD
  • CM guidelines for coding and reporting, ensuring that the acquired nature of the deformity is well
  • documented
  • Include any relevant history that supports the diagnosis

Exclusion Criteria

Do NOT use M21.80 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

28296CPT Code

Bunionectomy

Clinical Scenario

Performed for hallux valgus correction.

Documentation Requirements

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

Specialty Considerations

Orthopedic surgeons must document the specific nature of the deformity and 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 acquired deformities, improving the accuracy of patient records and facilitating better treatment planning.

ICD-9 vs ICD-10

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

Reimbursement & Billing Impact

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

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 types of deformities are classified under M21.80?

M21.80 includes various acquired deformities of the limbs, such as hallux valgus, finger abnormalities, and other unspecified deformities resulting from trauma or other acquired conditions.