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v1.0.0
ICD-10 Guide
ICD-10 CodesQ78.4

Q78.4

Billable

Enchondromatosis

BILLABLE STATUSYes
IMPLEMENTATION DATEOctober 1, 2015
LAST UPDATED09/11/2025

Code Description

ICD-10 Q78.4 is a billable code used to indicate a diagnosis of enchondromatosis.

Key Diagnostic Point:

Enchondromatosis is a rare genetic disorder characterized by the development of multiple benign cartilaginous tumors (enchondromas) within the bones, particularly affecting the long bones of the hands and feet. This condition is often associated with Ollier disease, where the enchondromas can lead to skeletal deformities and an increased risk of malignant transformation. Patients may present with limb deformities, pain, and functional impairment due to the presence of these tumors. The condition is typically diagnosed through imaging studies, such as X-rays or MRI, which reveal the characteristic lesions. Management may involve monitoring, surgical intervention for symptomatic lesions, and addressing any associated deformities. Enchondromatosis can also be linked to other congenital malformations, including limb reduction defects and scoliosis, making it essential for healthcare providers to conduct thorough assessments and provide comprehensive care.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Variability in clinical presentation and severity of symptoms
  • Need for precise documentation of associated deformities
  • Potential for malignant transformation requiring careful monitoring
  • Differentiation from other similar conditions (e.g., multiple hereditary exostoses)

Audit Risk Factors

  • Inadequate documentation of associated conditions
  • Failure to capture the severity of symptoms
  • Misclassification of enchondromatosis with other bone disorders
  • Lack of follow-up documentation for monitoring malignant potential

Specialty Focus

Medical Specialties

Pediatrics

Documentation Requirements

Documentation should include detailed descriptions of physical examinations, imaging results, and any functional limitations experienced by the child.

Common Clinical Scenarios

A pediatric patient presents with multiple bone deformities and pain in the limbs, requiring imaging and potential surgical intervention.

Billing Considerations

Coders should ensure that all associated congenital malformations are documented to provide a complete clinical picture.

Genetics

Documentation Requirements

Genetic testing results, family history of similar conditions, and any genetic counseling provided should be documented.

Common Clinical Scenarios

A child with a family history of enchondromatosis undergoes genetic testing to confirm the diagnosis and assess the risk for siblings.

Billing Considerations

Accurate coding requires understanding the genetic basis of the condition and its implications for family members.

Coding Guidelines

Inclusion Criteria

Use Q78.4 When
  • Coders should refer to the official ICD
  • CM guidelines for congenital malformations, ensuring that all relevant conditions are captured and that the coding reflects the clinical scenario accurately

Exclusion Criteria

Do NOT use Q78.4 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

20610CPT Code

Arthrocentesis, aspiration, and/or injection into a major joint or bursa

Clinical Scenario

Used when a patient with enchondromatosis presents with joint pain requiring aspiration.

Documentation Requirements

Document the reason for the procedure, including symptoms and imaging findings.

Specialty Considerations

Orthopedic specialists should ensure that the procedure is justified based on clinical findings.

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 enchondromatosis, improving the accuracy of data collection and reimbursement processes.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of conditions like enchondromatosis, improving the accuracy of data collection and reimbursement processes.

Reimbursement & Billing Impact

reimbursement processes.

Resources

Clinical References

  • •
    National Organization for Rare Disorders (NORD)

Coding & Billing References

  • •
    National Organization for Rare Disorders (NORD)

Frequently Asked Questions

What is the primary concern when coding for enchondromatosis?

The primary concern is ensuring accurate documentation of associated conditions and the potential for malignant transformation, which can affect treatment and management strategies.