Is ICD-10-CM code Q90 billable?

No, Q90 (Down syndrome) is a non-billable ICD-10-CM code. It must be coded to a more specific subcategory before it can be used for reimbursement.

What chapter does ICD-10-CM code Q90 belong to?

Q90 belongs to Chapter 17 of the ICD-10-CM tabular list: Q00–Q99 (Congenital Malformations, Deformations and Chromosomal Abnormalities).

Q90Non-billable

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

Use a more specific code (4 billable)

Excludes2(Not included here. Code separately if applicable.)

Excludes2(Not included here. Code separately if applicable.)

Code Also

associated physical condition(s), such as atrioventricular septal defect (Q21.2-)

Use Additional Code

code(s) to identify any associated degree of intellectual disabilities (F70-F79)

BillableHas subcodes

CH17Congenital malformations, deformations and chromosomal abnormalities (Q00-QA0)

Q90-Q99Chromosomal abnormalities, not elsewhere classified (Q90-Q99)

Q90Down syndromeNot billable

Q90.0Trisomy 21, nonmosaicism (meiotic nondisjunction)Billable

Q90.1Trisomy 21, mosaicism (mitotic nondisjunction)Billable

Q90.2Trisomy 21, translocationBillable

Q90.9Down syndrome, unspecifiedBillable

2026

No direct MS-DRG triggers identified.