All ICD10 Codes
Q91Non-billable

Trisomy 18 and Trisomy 13

Congenital Malformations, Deformations and Chromosomal Abnormalities·Chromosomal abnormalities, not elsewhere classified (Q90-Q99)·category·FY 2026

Use a more specific code (8 billable)
Q91.0Trisomy 18, nonmosaicism (meiotic nondisjunction)Q91.1Trisomy 18, mosaicism (mitotic nondisjunction)Q91.2Trisomy 18, translocationQ91.3Trisomy 18, unspecifiedQ91.4Trisomy 13, nonmosaicism (meiotic nondisjunction)Q91.5Trisomy 13, mosaicism (mitotic nondisjunction)Q91.6Trisomy 13, translocationQ91.7Trisomy 13, unspecified

CH17 Parent Instructions

Excludes2(Not included here. Code separately if applicable.)
  • inborn errors of metabolism (E70-E88)

Q90-Q99 Parent Instructions

Excludes2(Not included here. Code separately if applicable.)
  • mitochondrial metabolic disorders (E88.4-)

Clinical Hierarchy

BillableHas subcodes
CH17Congenital malformations, deformations and chromosomal abnormalities (Q00-QA0)
Q90-Q99Chromosomal abnormalities, not elsewhere classified (Q90-Q99)
Q91Trisomy 18 and Trisomy 13Not billable
Q91.0Trisomy 18, nonmosaicism (meiotic nondisjunction)Billable
Q91.1Trisomy 18, mosaicism (mitotic nondisjunction)Billable
Q91.2Trisomy 18, translocationBillable
Q91.3Trisomy 18, unspecifiedBillable
Q91.4Trisomy 13, nonmosaicism (meiotic nondisjunction)Billable
Q91.5Trisomy 13, mosaicism (mitotic nondisjunction)Billable
Q91.6Trisomy 13, translocationBillable
Q91.7Trisomy 13, unspecifiedBillable

MS-DRG Classification

2026

No direct MS-DRG triggers identified.