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v1.0.0
ICD-10 Guide
ICD-10 CodesQ77.4

Q77.4

Billable

Achondroplasia

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

Code Description

ICD-10 Q77.4 is a billable code used to indicate a diagnosis of achondroplasia.

Key Diagnostic Point:

Achondroplasia is a genetic disorder characterized by an abnormality in the growth of cartilage, leading to disproportionate short stature. It is the most common form of skeletal dysplasia, resulting from a mutation in the FGFR3 gene, which regulates bone growth. Individuals with achondroplasia typically present with a normal-sized torso and shorter limbs, particularly affecting the long bones. Other associated features may include macrocephaly, prominent forehead, and a flattened nasal bridge. The condition is usually diagnosed at birth or during early childhood through clinical evaluation and radiographic findings. Achondroplasia is inherited in an autosomal dominant pattern, meaning that a single copy of the mutated gene can cause the disorder. While the condition itself is not life-threatening, it can lead to various complications, including spinal stenosis, obesity, and orthopedic issues such as scoliosis or limb deformities. Management often involves a multidisciplinary approach, including pediatricians, orthopedic surgeons, and genetic counselors, to address the various health concerns associated with the condition.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Variability in clinical presentation and associated conditions
  • Need for genetic testing documentation
  • Differentiation from other skeletal dysplasias
  • Potential for associated complications requiring additional coding

Audit Risk Factors

  • Inadequate documentation of genetic testing results
  • Failure to document associated conditions or complications
  • Misclassification with other skeletal dysplasias
  • Lack of family history documentation

Specialty Focus

Medical Specialties

Pediatrics

Documentation Requirements

Pediatric documentation should include growth measurements, developmental milestones, and any orthopedic evaluations.

Common Clinical Scenarios

Common scenarios include routine check-ups, evaluations for orthopedic issues, and assessments for developmental delays.

Billing Considerations

Coders should ensure that all relevant clinical findings are documented to support the diagnosis and any associated conditions.

Genetics

Documentation Requirements

Genetic documentation needs to include results from genetic testing, family history, and any counseling provided.

Common Clinical Scenarios

Genetic counseling sessions, diagnostic evaluations, and discussions regarding recurrence risks in families.

Billing Considerations

Accurate coding requires detailed documentation of genetic findings and family history to support the diagnosis of achondroplasia.

Coding Guidelines

Inclusion Criteria

Use Q77.4 When
  • According to the ICD
  • 10 coding guidelines, congenital conditions like achondroplasia should be coded based on the specific diagnosis and any associated complications
  • Coders must ensure that documentation supports the diagnosis and any additional codes for related conditions

Exclusion Criteria

Do NOT use Q77.4 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

99213CPT Code

Established patient office visit, Level 3

Clinical Scenario

Used for routine follow-up visits for children with achondroplasia.

Documentation Requirements

Documentation must include growth measurements and developmental assessments.

Specialty Considerations

Pediatricians should ensure comprehensive evaluations are documented.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of achondroplasia, improving the ability to capture associated conditions and complications accurately.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of achondroplasia, improving the ability to capture associated conditions and complications accurately.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of achondroplasia, improving the ability to capture associated conditions and complications accurately.

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 cause of achondroplasia?

Achondroplasia is primarily caused by a mutation in the FGFR3 gene, which affects the growth of cartilage and bone, leading to characteristic skeletal features.