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v1.0.0
ICD-10 Guide
ICD-10 CodesM21.951

M21.951

Billable

Unspecified acquired deformity of right thigh

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

Code Description

ICD-10 M21.951 is a billable code used to indicate a diagnosis of unspecified acquired deformity of right thigh.

Key Diagnostic Point:

M21.951 refers to an unspecified acquired deformity of the right thigh, which can arise from various causes including trauma, surgery, or underlying medical conditions. Acquired deformities may manifest as changes in the bone structure, muscle tone, or soft tissue, leading to functional impairments. Common causes include fractures that heal improperly, infections, or conditions such as osteoarthritis that alter the normal anatomy of the thigh. Patients may present with symptoms such as pain, limited range of motion, or visible deformity. Diagnosis typically involves a thorough clinical examination and imaging studies such as X-rays or MRIs to assess the extent of the deformity and any associated complications. Treatment options vary based on the severity and underlying cause of the deformity and may include physical therapy, orthotic devices, or surgical interventions aimed at correcting the deformity and restoring function.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Variability in clinical presentation and underlying causes
  • Need for precise documentation to specify the nature of the deformity
  • Potential for multiple co-existing conditions affecting the thigh
  • Differentiation from congenital deformities

Audit Risk Factors

  • Inadequate documentation of the deformity's cause
  • Failure to specify laterality when applicable
  • Misclassification of congenital vs. acquired deformities
  • Lack of supporting imaging or clinical notes

Specialty Focus

Medical Specialties

Orthopedics

Documentation Requirements

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

Common Clinical Scenarios

Post-traumatic deformities, post-surgical complications, degenerative changes.

Billing Considerations

Ensure clarity in the description of the deformity and its impact on function.

Physical Medicine and Rehabilitation

Documentation Requirements

Comprehensive assessments including functional limitations and rehabilitation goals.

Common Clinical Scenarios

Rehabilitation following orthopedic surgery or trauma.

Billing Considerations

Focus on functional outcomes and the impact of the deformity on daily activities.

Coding Guidelines

Inclusion Criteria

Use M21.951 When
  • Follow the official ICD
  • CM coding guidelines, ensuring that the code is used only when the deformity is acquired and not congenital
  • Document the specific nature of the deformity and any associated conditions

Exclusion Criteria

Do NOT use M21.951 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

27447CPT Code

Osteotomy, femur

Clinical Scenario

Used for surgical correction of acquired deformities of the thigh.

Documentation Requirements

Operative reports detailing the procedure and indications.

Specialty Considerations

Orthopedic surgeons must document the rationale for surgery and expected outcomes.

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 diagnoses and treatment plans. M21.951 provides a clear classification for acquired deformities of the thigh, facilitating better patient management.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of acquired deformities, improving the accuracy of diagnoses and treatment plans. M21.951 provides a clear classification for acquired deformities of the thigh, facilitating better patient management.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of acquired deformities, improving the accuracy of diagnoses and treatment plans. M21.951 provides a clear classification for acquired deformities of the thigh, facilitating better patient management.

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 deformities?

Congenital deformities are present at birth and result from genetic or environmental factors during fetal development, while acquired deformities develop after birth due to injury, disease, or other external factors.