Q91.4
Trisomy 13, nonmosaicism (meiotic nondisjunction)
Clinical Classification Guidelines
Medical Intelligence & Overview
Trisomy 13, also known as Patau syndrome, is a genetic disorder caused by an extra copy of chromosome 13. The specific type with nonmosaicism occurs when every cell in the body contains the additional chromosome, resulting from a meiotic nondisjunction event. This condition is characterized by severe birth defects and developmental abnormalities. Early diagnosis and supportive care are essential for managing the complex health challenges associated with trisomy 13.
Causes & Symptoms
Clinical Causes: Failure of chromosome 13 to separate properly during the formation of reproductive cells (meiosis), resulting in an egg or sperm with an extra chromosome The presence of a full extra chromosome 13 in all cells (nonmosaicism), which differs from mosaic cases where only some cells contain the extra chromosome Advanced maternal age, which increases the risk of nondisjunction events during egg development
Key Symptoms: Cleft lip and/or cleft palate Incomplete brain and skull development, leading to microcephaly Polydactyly (extra fingers or toes) Structural abnormalities of the heart and other organs Eyeball abnormalities (such as small or absent eyes) Low-set ears and a small head Severe intellectual disability and developmental delays Nasal and lip defects Digestive tract anomalies, such as omphalocele (intestines/other organs outside the abdomen)
Diagnostic & Treatment
Diagnosis Path: Diagnosis of trisomy 13 typically involves an initial prenatal screening, including ultrasound examinations that can reveal physical anomalies. Confirmatory testing may include:
Treatment Protocols: There is no cure for trisomy 13. Treatments focus on supportive care and managing symptoms to improve quality of life. Approaches may include:
Clinical Advice & FAQs
Billing Guidance
Is Q91.4 a billable ICD-10 code?
Yes, Q91.4 is a specific, billable code that can be used to indicate a diagnosis for reimbursement purposes.
Documentation
How do I report Q91.4?
Clinical documentation must specify the nature of Trisomy 13, nonmosaicism (meiotic nondisjunction) and any associated comorbidities for accurate reporting.
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