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ICD-10 Guide
ICD-10 CodesM21.769

M21.769

Billable

Unequal limb length (acquired), unspecified tibia and fibula

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

Code Description

ICD-10 M21.769 is a billable code used to indicate a diagnosis of unequal limb length (acquired), unspecified tibia and fibula.

Key Diagnostic Point:

Unequal limb length, or limb length discrepancy, refers to a condition where one limb is shorter than the other due to acquired factors. This can occur as a result of trauma, surgical interventions, infections, or diseases that affect bone growth and development. In the case of the tibia and fibula, the discrepancy can lead to functional impairments, gait abnormalities, and increased risk of osteoarthritis in the longer limb due to altered biomechanics. The condition may be identified through physical examination and imaging studies, such as X-rays or MRI, which can help determine the extent of the discrepancy and any underlying causes. Treatment options may include orthopedic interventions, such as limb lengthening procedures, corrective osteotomies, or the use of orthotic devices to balance limb lengths. Accurate coding is essential for proper reimbursement and to reflect the complexity of the condition and its management.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Variability in documentation of acquired causes
  • Differentiation from congenital limb length discrepancies
  • Need for precise measurement and assessment
  • Potential for multiple treatment modalities

Audit Risk Factors

  • Inadequate documentation of the cause of limb length discrepancy
  • Failure to specify the affected limb
  • Lack of supporting clinical evidence for acquired conditions
  • Improper coding of associated procedures or treatments

Specialty Focus

Medical Specialties

Orthopedics

Documentation Requirements

Detailed clinical notes on the cause of the limb length discrepancy, treatment plans, and follow-up assessments.

Common Clinical Scenarios

Patients with post-traumatic limb length discrepancies, those requiring corrective surgeries, or individuals with conditions affecting bone growth.

Billing Considerations

Ensure accurate measurement of limb lengths and clear documentation of any surgical interventions or orthotic devices used.

Physical Therapy

Documentation Requirements

Progress notes detailing functional assessments, treatment goals, and interventions aimed at improving mobility and function.

Common Clinical Scenarios

Patients undergoing rehabilitation post-surgery for limb lengthening or those using orthotics to manage discrepancies.

Billing Considerations

Document the impact of limb length discrepancy on functional mobility and any adaptations made during therapy.

Coding Guidelines

Inclusion Criteria

Use M21.769 When
  • According to ICD
  • 10 guidelines, M21
  • 769 should be used when the specific cause of the acquired limb length discrepancy is not documented
  • Coders should ensure that the documentation supports the diagnosis and that any associated conditions are also coded appropriately

Exclusion Criteria

Do NOT use M21.769 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

27500CPT Code

Osteotomy, tibia, with or without lengthening

Clinical Scenario

Used for surgical correction of limb length discrepancies.

Documentation Requirements

Operative reports detailing the procedure and indications for surgery.

Specialty Considerations

Orthopedic surgeons should document pre-operative assessments and post-operative 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 limb length discrepancies, improving the accuracy of data collection and reimbursement processes. This specificity helps in tracking treatment outcomes and resource utilization.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of acquired limb length discrepancies, improving the accuracy of data collection and reimbursement processes. This specificity helps in tracking treatment outcomes and resource utilization.

Reimbursement & Billing Impact

reimbursement processes. This specificity helps in tracking treatment outcomes and resource utilization.

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 limb length discrepancies?

Congenital discrepancies are present at birth and result from developmental issues, while acquired discrepancies develop later due to trauma, surgery, or disease affecting bone growth.