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ICD-10 Guide
ICD-10 CodesM21.752

M21.752

Billable

Unequal limb length (acquired), left femur

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

Code Description

ICD-10 M21.752 is a billable code used to indicate a diagnosis of unequal limb length (acquired), left femur.

Key Diagnostic Point:

Unequal limb length, also known as limb length discrepancy, refers to a condition where one limb is shorter than the other due to various acquired factors. In the case of M21.752, the focus is on the left femur. This condition can arise from trauma, surgical interventions, infections, or diseases that affect bone growth and development. Acquired limb length discrepancies can lead to functional impairments, gait abnormalities, and increased risk of osteoarthritis in the affected limb. Clinically, patients may present with complaints of pain, difficulty in walking, or compensatory postural changes. Diagnosis typically involves a thorough clinical examination, imaging studies such as X-rays or MRI, and sometimes gait analysis. Treatment options may include orthopedic interventions, such as limb lengthening procedures, corrective osteotomies, or the use of orthotic devices to balance the limb lengths. Accurate coding is essential for appropriate management 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

  • Variability in documentation of acquired causes
  • Need for precise measurement of limb lengths
  • Differentiation from congenital limb length discrepancies
  • Potential for multiple underlying conditions

Audit Risk Factors

  • Inadequate documentation of the acquired nature of the condition
  • Failure to specify the affected limb accurately
  • Lack of supporting imaging or clinical evidence
  • Misclassification with congenital conditions

Specialty Focus

Medical Specialties

Orthopedics

Documentation Requirements

Detailed clinical notes on the history of the limb length discrepancy, imaging results, and treatment plans.

Common Clinical Scenarios

Patients with post-traumatic limb length discrepancies, those undergoing limb lengthening procedures, or patients with osteoarthritis secondary to unequal limb lengths.

Billing Considerations

Ensure that all acquired causes are documented, including trauma history and any surgical interventions.

Physical Medicine and Rehabilitation

Documentation Requirements

Functional assessments, gait analysis, and rehabilitation plans must be documented.

Common Clinical Scenarios

Patients requiring rehabilitation after limb lengthening or those with functional impairments due to limb length discrepancies.

Billing Considerations

Focus on the impact of the discrepancy on mobility and quality of life.

Coding Guidelines

Inclusion Criteria

Use M21.752 When
  • Follow official ICD
  • 10 coding guidelines, ensuring accurate documentation of the acquired nature of the condition
  • Include details on the cause of the discrepancy and any associated conditions

Exclusion Criteria

Do NOT use M21.752 When
  • Exclude congenital conditions unless specified

Related ICD-10 Codes

Related CPT Codes

27500CPT Code

Osteotomy, femur, for limb lengthening

Clinical Scenario

Used in cases where surgical intervention is required to correct limb length discrepancies.

Documentation Requirements

Surgical notes detailing the procedure, indications, and post-operative care.

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 conditions like M21.752, improving the accuracy of patient records and facilitating better management and reimbursement processes.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of acquired conditions like M21.752, improving the accuracy of patient records and facilitating better management and reimbursement processes.

Reimbursement & Billing Impact

reimbursement processes.

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 are the common causes of acquired limb length discrepancies?

Common causes include trauma, surgical interventions, infections, and diseases affecting bone growth such as osteomyelitis or tumors.