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ICD-10 Guide
ICD-10 CodesM21.734

M21.734

Billable

Unequal limb length (acquired), left radius

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

Code Description

ICD-10 M21.734 is a billable code used to indicate a diagnosis of unequal limb length (acquired), left radius.

Key Diagnostic Point:

Unequal limb length, particularly involving the left radius, is a condition characterized by a discrepancy in the lengths of the limbs 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. For instance, a fracture in the radius that heals improperly can lead to a shorter limb on one side. Additionally, conditions such as osteomyelitis or tumors may necessitate surgical procedures that can result in limb length discrepancies. The clinical implications of unequal limb length can be significant, affecting gait, posture, and overall mobility. Patients may experience discomfort, pain, or functional limitations, necessitating corrective measures. Treatment options may include physical therapy, orthotic devices, or surgical interventions aimed at correcting the length discrepancy and restoring function. Accurate coding of this condition is crucial for appropriate management and reimbursement, as it reflects the complexity of the patient's clinical situation and the interventions required.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Differentiating between congenital and acquired conditions
  • Understanding the underlying causes of limb length discrepancies
  • Documenting the specific anatomical site affected (left radius)
  • Identifying associated conditions or complications

Audit Risk Factors

  • Inadequate documentation of the acquired nature of the condition
  • Failure to specify the anatomical site (left radius)
  • Lack of clarity regarding the underlying cause of the limb length discrepancy
  • Incorrect linkage of the diagnosis to treatment procedures

Specialty Focus

Medical Specialties

Orthopedics

Documentation Requirements

Detailed clinical notes on the patient's history, physical examination findings, and imaging studies.

Common Clinical Scenarios

Post-fracture evaluations, pre-operative assessments for corrective surgeries, and follow-up visits for limb length discrepancies.

Billing Considerations

Ensure that all surgical interventions and their outcomes are well-documented to support the coding of M21.734.

Physical Therapy

Documentation Requirements

Therapy notes detailing the patient's functional limitations, treatment goals, and progress.

Common Clinical Scenarios

Rehabilitation following surgery for limb length correction or therapy for functional improvement.

Billing Considerations

Documenting the impact of unequal limb length on mobility and function is essential for accurate coding.

Coding Guidelines

Inclusion Criteria

Use M21.734 When
  • According to ICD
  • 10 guidelines, M21
  • 734 should be used when the unequal limb length is acquired and specifically affects the left radius
  • Coders must ensure that the documentation supports the acquired nature of the condition and any associated factors

Exclusion Criteria

Do NOT use M21.734 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

27500CPT Code

Lengthening of limb

Clinical Scenario

Used in cases where surgical correction of limb length discrepancy is performed.

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 M21.734, improving the accuracy of patient records and reimbursement processes.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of acquired conditions like M21.734, improving the accuracy of patient records 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 is the primary cause of unequal limb length in adults?

In adults, unequal limb length is often acquired due to trauma, surgical interventions, or diseases affecting bone growth, such as infections or tumors.