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v1.0.0
ICD-10 Guide
ICD-10 CodesQ91.2

Q91.2

Billable

Trisomy 18, translocation

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

Code Description

ICD-10 Q91.2 is a billable code used to indicate a diagnosis of trisomy 18, translocation.

Key Diagnostic Point:

Trisomy 18, also known as Edwards syndrome, is a chromosomal abnormality characterized by the presence of an extra 18th chromosome. In cases classified under Q91.2, this extra chromosome arises from a translocation event, where a segment of chromosome 18 is attached to another chromosome. This condition leads to severe developmental delays, multiple congenital malformations, and a high mortality rate, particularly in the neonatal period. Common physical features include a small head, a prominent back of the head, low-set ears, clenched fists, and overlapping fingers. Internal organ anomalies are also prevalent, including heart defects and kidney malformations. The severity of symptoms can vary significantly among affected individuals, and while some may survive beyond infancy, many do not live past their first year. Genetic counseling is crucial for families affected by this condition, as it provides information on recurrence risks and management options. Accurate coding of Trisomy 18, translocation is essential for appropriate clinical management and resource allocation.

Code Complexity Analysis

Complexity Rating: High

High Complexity

Complexity Factors

  • Differentiation between translocation and other forms of trisomy.
  • Need for precise genetic testing documentation.
  • Variability in clinical presentation and severity.
  • Potential for co-occurring congenital anomalies.

Audit Risk Factors

  • Inadequate documentation of genetic testing results.
  • Misclassification of trisomy types.
  • Failure to document associated congenital anomalies.
  • Inconsistent use of codes for related conditions.

Specialty Focus

Medical Specialties

Pediatrics

Documentation Requirements

Pediatric documentation must include detailed growth and developmental assessments, descriptions of physical findings, and any interventions or treatments provided.

Common Clinical Scenarios

Common scenarios include newborn assessments in the NICU, follow-up visits for developmental milestones, and management of associated congenital anomalies.

Billing Considerations

Pediatric coders should be aware of the need for comprehensive documentation that reflects the multidisciplinary approach often required for these patients.

Genetics

Documentation Requirements

Genetic documentation should include results from karyotyping, family history, and any genetic counseling sessions conducted.

Common Clinical Scenarios

Scenarios often involve prenatal genetic testing, postnatal diagnosis, and counseling for families regarding recurrence risks.

Billing Considerations

Genetic coders must ensure that all genetic testing results are accurately reflected in the medical record to support the diagnosis.

Coding Guidelines

Inclusion Criteria

Use Q91.2 When
  • According to ICD
  • 10 coding guidelines, congenital conditions like Q91
  • 2 should be coded based on the specific chromosomal abnormality and any associated congenital anomalies
  • Documentation must support the diagnosis and reflect the complexity of care provided

Exclusion Criteria

Do NOT use Q91.2 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

81228CPT Code

Chromosomal analysis, karyotype

Clinical Scenario

Used for confirming the diagnosis of Trisomy 18 through genetic testing.

Documentation Requirements

Documentation must include the reason for testing and results.

Specialty Considerations

Genetic specialists should ensure that all relevant family history is documented.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of chromosomal abnormalities, improving the accuracy of data collection and resource allocation for conditions like Trisomy 18.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of chromosomal abnormalities, improving the accuracy of data collection and resource allocation for conditions like Trisomy 18.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of chromosomal abnormalities, improving the accuracy of data collection and resource allocation for conditions like Trisomy 18.

Resources

Clinical References

  • •
    National Down Syndrome Society
  • •
    Genetics Home Reference

Coding & Billing References

  • •
    National Down Syndrome Society
  • •
    Genetics Home Reference

Frequently Asked Questions

What is the significance of coding Q91.2?

Coding Q91.2 is crucial for identifying patients with Trisomy 18, which allows for appropriate clinical management, resource allocation, and research into the condition. Accurate coding also supports genetic counseling and family planning discussions.