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ICD-10 Guide
ICD-10 CodesM21.732

M21.732

Billable

Unequal limb length (acquired), left ulna

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

Code Description

ICD-10 M21.732 is a billable code used to indicate a diagnosis of unequal limb length (acquired), left ulna.

Key Diagnostic Point:

Unequal limb length, particularly in the context of the left ulna, refers to a condition where one limb is shorter than the other due to acquired factors rather than congenital anomalies. This condition can arise from various causes, including trauma, surgical interventions, or diseases that affect bone growth and development. In the case of the left ulna, the discrepancy in length can lead to functional impairments, affecting the patient's ability to perform daily activities and potentially leading to compensatory mechanisms that may cause pain or further musculoskeletal issues. Treatment often involves corrective procedures, such as limb lengthening or osteotomy, and rehabilitation to restore function and alleviate discomfort. Accurate coding of this condition is crucial for appropriate management and reimbursement, as it reflects the complexity of the patient's clinical scenario and the interventions required.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Differentiating between congenital and acquired conditions
  • Need for precise documentation of the cause of unequal limb length
  • Potential for multiple associated conditions (e.g., fractures, deformities)
  • Variability in treatment approaches and their documentation

Audit Risk Factors

  • Inadequate documentation of the cause of the acquired condition
  • Failure to specify the affected limb accurately
  • Lack of clarity on associated procedures or treatments
  • Inconsistent coding practices across different providers

Specialty Focus

Medical Specialties

Orthopedics

Documentation Requirements

Detailed clinical notes outlining the history of the condition, diagnostic imaging results, and treatment plans.

Common Clinical Scenarios

Patients presenting with post-traumatic limb length discrepancies or those requiring corrective surgery.

Billing Considerations

Ensure that all surgical interventions and their outcomes are documented to support the coding of M21.732.

Physical Medicine and Rehabilitation

Documentation Requirements

Comprehensive assessments of functional limitations and rehabilitation goals.

Common Clinical Scenarios

Patients undergoing rehabilitation post-surgery for limb length correction or those with chronic pain due to unequal limb length.

Billing Considerations

Documenting the impact of the condition on daily activities and the need for assistive devices.

Coding Guidelines

Inclusion Criteria

Use M21.732 When
  • According to ICD
  • 10 coding guidelines, M21
  • 732 should be used when the unequal limb length is specifically acquired and documented as such
  • It is essential to include the left ulna in the documentation to ensure accurate coding

Exclusion Criteria

Do NOT use M21.732 When
  • Exclusion criteria include congenital conditions or those resulting from systemic diseases

Related ICD-10 Codes

Related CPT Codes

27500CPT Code

Osteotomy, femur or tibia

Clinical Scenario

Used in cases where surgical correction of limb length is necessary.

Documentation Requirements

Surgical notes detailing the procedure and rationale for correction.

Specialty Considerations

Orthopedic documentation must include pre-operative assessments and post-operative follow-ups.

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 M21.732, improving the accuracy of patient records and facilitating better management of care.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of acquired conditions like M21.732, improving the accuracy of patient records and facilitating better management of care.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of acquired conditions like M21.732, improving the accuracy of patient records and facilitating better management of care.

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 documentation is required to support the use of M21.732?

Documentation must include a clear history of the acquired condition, diagnostic imaging results, and treatment plans that outline the impact of the unequal limb length on the patient's function.