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ICD-10 Guide
ICD-10 CodesM21.733

M21.733

Billable

Unequal limb length (acquired), right radius

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

Code Description

ICD-10 M21.733 is a billable code used to indicate a diagnosis of unequal limb length (acquired), right radius.

Key Diagnostic Point:

Unequal limb length (acquired) refers to a condition where one limb is shorter than the other due to factors such as trauma, surgery, or disease processes that affect bone growth or integrity. In the case of the right radius, this condition may arise from fractures that heal improperly, surgical interventions that alter limb length, or conditions like osteomyelitis that can lead to bone loss. The acquired nature of this deformity distinguishes it from congenital limb length discrepancies, which are present at birth. Clinically, patients may experience functional limitations, gait abnormalities, and compensatory postures that can lead to secondary musculoskeletal issues. Treatment often involves corrective procedures such as limb lengthening, osteotomy, or the use of orthotic devices to improve function and aesthetics. Accurate coding of this condition is crucial for appropriate management and reimbursement, as it reflects the complexity of the patient's needs and the interventions required to address them.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Differentiating between acquired and congenital conditions
  • Understanding the specific anatomical site (right radius)
  • Identifying the underlying cause of the unequal limb length
  • Documenting the impact on function and potential treatments

Audit Risk Factors

  • Inadequate documentation of the cause of unequal limb length
  • Failure to specify the affected limb and anatomical site
  • Misclassification of acquired versus congenital conditions
  • Lack of supporting clinical evidence for corrective procedures

Specialty Focus

Medical Specialties

Orthopedics

Documentation Requirements

Detailed history of the injury or condition, imaging studies, and treatment plans.

Common Clinical Scenarios

Post-fracture evaluations, pre-operative assessments for limb lengthening, and follow-up visits after corrective surgery.

Billing Considerations

Ensure that all surgical interventions and their outcomes are clearly documented to support coding.

Physical Medicine and Rehabilitation

Documentation Requirements

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

Common Clinical Scenarios

Rehabilitation following limb lengthening procedures, management of gait abnormalities, and fitting of orthotic devices.

Billing Considerations

Documenting the impact of unequal limb length on daily activities and quality of life is essential for comprehensive coding.

Coding Guidelines

Inclusion Criteria

Use M21.733 When
  • According to ICD
  • 10 coding guidelines, M21
  • 733 should be used when the unequal limb length is acquired and specifically affects the right radius
  • Coders must ensure that the documentation supports the diagnosis and that any associated conditions are also coded appropriately

Exclusion Criteria

Do NOT use M21.733 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

27416CPT Code

Osteotomy, femur or tibia

Clinical Scenario

Used in cases where limb lengthening is required due to unequal limb length.

Documentation Requirements

Pre-operative assessments, surgical notes, and post-operative follow-up documentation.

Specialty Considerations

Orthopedic specialists 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 greater specificity in coding conditions like unequal limb length, enabling better tracking of treatment outcomes and resource allocation. M21.733 provides a clear framework for documenting acquired conditions, which can improve patient care and reimbursement processes.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for greater specificity in coding conditions like unequal limb length, enabling better tracking of treatment outcomes and resource allocation. M21.733 provides a clear framework for documenting acquired conditions, which can improve patient care 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 difference between acquired and congenital unequal limb length?

Acquired unequal limb length occurs due to factors such as trauma, surgery, or disease processes after birth, while congenital unequal limb length is present at birth due to genetic or developmental factors.