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v1.0.0
ICD-10 Guide
ICD-10 CodesM21.2

M21.2

Billable

Flexion deformity

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

Code Description

ICD-10 M21.2 is a billable code used to indicate a diagnosis of flexion deformity.

Key Diagnostic Point:

Flexion deformity refers to a condition where a joint is permanently bent, resulting in a reduced range of motion and functional impairment. This deformity can occur in various joints, including fingers and toes, and is often acquired due to conditions such as arthritis, trauma, or neurological disorders. In the case of finger flexion deformities, patients may experience difficulty in extending their fingers fully, which can impact daily activities such as grasping objects or typing. Similarly, toe flexion deformities, such as hammer toes, can lead to discomfort in footwear and affect ambulation. Hallux valgus, commonly known as a bunion, is a specific type of flexion deformity affecting the big toe, where the toe deviates laterally, causing pain and difficulty in walking. Corrective procedures, such as surgical interventions, may be necessary to restore function and alleviate pain. Accurate coding of flexion deformities is crucial for appropriate treatment planning and reimbursement.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Variety of underlying causes (e.g., arthritis, trauma)
  • Differentiation between congenital and acquired deformities
  • Need for detailed documentation of functional impairment
  • Potential for multiple joint involvement

Audit Risk Factors

  • Inadequate documentation of the deformity's impact on function
  • Failure to specify the joint involved
  • Lack of evidence for acquired versus congenital deformity
  • Inconsistent coding of associated conditions

Specialty Focus

Medical Specialties

Orthopedics

Documentation Requirements

Detailed clinical notes describing the deformity, range of motion assessments, and treatment plans.

Common Clinical Scenarios

Patients presenting with pain and functional limitations due to finger or toe deformities.

Billing Considerations

Ensure to document any previous treatments or surgeries related to the deformity.

Physical Medicine and Rehabilitation

Documentation Requirements

Functional assessments, treatment goals, and progress notes regarding rehabilitation efforts.

Common Clinical Scenarios

Patients undergoing therapy for post-surgical recovery or conservative management of flexion deformities.

Billing Considerations

Document the patient's functional abilities and limitations to support the need for therapy.

Coding Guidelines

Inclusion Criteria

Use M21.2 When
  • Follow official ICD
  • 10 coding guidelines, ensuring accurate documentation of the deformity's nature, location, and any associated conditions
  • Include details on the functional impact and treatment history

Exclusion Criteria

Do NOT use M21.2 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 should document the severity of the deformity and any conservative treatments attempted.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of flexion deformities, improving the accuracy of data collection and reimbursement processes. It enables better tracking of treatment outcomes and resource utilization.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of flexion deformities, improving the accuracy of data collection and reimbursement processes. It enables better tracking of treatment outcomes and resource utilization.

Reimbursement & Billing Impact

reimbursement processes. It enables better tracking of treatment outcomes and resource utilization.

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 congenital and acquired flexion deformities?

Congenital flexion deformities are present at birth and often result from genetic factors, while acquired flexion deformities develop later in life due to conditions such as arthritis, trauma, or neurological disorders.