All ICD10 Codes

Q90

Non-Billable
ChapterQ00–Q99
Rankcategory
Official Description

Down syndrome

Use a more specific code (4 billable)
Q90.0Trisomy 21, nonmosaicism (meiotic nondisjunction)Q90.1Trisomy 21, mosaicism (mitotic nondisjunction)Q90.2Trisomy 21, translocationQ90.9Down syndrome, unspecified
Metadata & Insights
  • •Non-billable category (requires more specific sub-code).
  • •Chapter 17: Congenital Malformations, Deformations and Chromosomal Abnormalities (Q00-Q99).

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-)

Instructional Notes

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)

Clinical Hierarchy

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

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to Q90:

blockQ90-Q99
Chromosomal abnormalities, not elsewhere classified (Q90-Q99)
View context instructions
chapterCH17
Congenital malformations, deformations and chromosomal abnormalities (Q00-QA0)
View context instructions

MS-DRG Classification

2026

No direct MS-DRG triggers identified.

Cross Reference

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