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ICD-10 Guide
ICD-10 CodesM21.722

M21.722

Billable

Unequal limb length (acquired), left humerus

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

Code Description

ICD-10 M21.722 is a billable code used to indicate a diagnosis of unequal limb length (acquired), left humerus.

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. In the case of M21.722, the focus is on the left humerus. This condition can arise from various causes, including trauma, surgical interventions, or diseases that affect bone growth and development. Acquired limb length discrepancies can result from conditions such as osteomyelitis, fractures that heal improperly, or surgical resections. The clinical implications of unequal limb length can be significant, leading to functional limitations, gait abnormalities, and increased risk of joint degeneration. Patients may experience pain, difficulty in mobility, and compensatory changes in posture. Treatment options often include corrective procedures such as limb lengthening surgeries, osteotomies, or the use of orthotic devices to improve function and alignment. 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
  • Differentiation from congenital limb length discrepancies
  • Need for precise anatomical localization (left humerus)
  • Potential for multiple co-existing conditions affecting limb length

Audit Risk Factors

  • Inadequate documentation of the acquired nature of the condition
  • Failure to specify the affected limb accurately
  • Lack of clarity on the underlying cause of the limb length discrepancy
  • Inconsistent coding of associated procedures

Specialty Focus

Medical Specialties

Orthopedics

Documentation Requirements

Detailed clinical notes on the cause of limb length discrepancy, treatment plans, and outcomes.

Common Clinical Scenarios

Post-traumatic limb length discrepancies, surgical corrections, and management of osteomyelitis.

Billing Considerations

Ensure that all relevant imaging and surgical reports are included to support the diagnosis.

Physical Medicine and Rehabilitation

Documentation Requirements

Comprehensive assessments of functional limitations and rehabilitation goals.

Common Clinical Scenarios

Rehabilitation following limb lengthening procedures or orthopedic surgeries.

Billing Considerations

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

Coding Guidelines

Inclusion Criteria

Use M21.722 When
  • According to ICD
  • 10 guidelines, M21
  • 722 should be used when the limb length discrepancy is acquired and specifically affects the left humerus
  • Coders must ensure that the documentation supports the acquired nature of the condition and that it is not congenital

Exclusion Criteria

Do NOT use M21.722 When
  • Exclusions include congenital limb length discrepancies and conditions that do not specifically affect the humerus

Related ICD-10 Codes

Related CPT Codes

27416CPT Code

Lengthening of limb

Clinical Scenario

Used in cases of significant limb length discrepancy requiring surgical intervention.

Documentation Requirements

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

Specialty Considerations

Orthopedic surgeons must provide comprehensive pre-operative assessments.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of conditions like unequal limb length, improving the accuracy of patient records and facilitating better treatment planning. M21.722 provides a clear distinction between acquired and congenital conditions, which is crucial for appropriate management and reimbursement.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of conditions like unequal limb length, improving the accuracy of patient records and facilitating better treatment planning. M21.722 provides a clear distinction between acquired and congenital conditions, which is crucial for appropriate management and reimbursement.

Reimbursement & Billing Impact

reimbursement.

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 limb length discrepancies?

Acquired limb length discrepancies occur due to factors such as trauma, surgery, or disease, while congenital discrepancies are present at birth and often have genetic or developmental origins.