Alphabetic Index FY2027

Q90.2

Trisomy 21, translocation

FY2027Chapter 17: Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders/Q90–Q99 Chromosomal abnormalities, not elsewhere classified

BillableComplete code, valid to report
Care settingsHome Health Primary · MMTA - OtherIPF Primary · MS-DRG 884

Q90.2 (also written Q902) is a billable ICD-10-CM diagnosis code for trisomy 21, translocation. It is part of the FY2027 code set, effective October 1, 2026. It is one of the 4 codes in category Q90 (Down syndrome). The Alphabetic Index lists it under 5 entries. Its coding notes include a Use additional code instruction, a Code also instruction and 2 Excludes2 entries.

Guidelines tip

From the FY2027 Official Guidelines. ICD10Ref adds no rules of its own.

Chapter 17 codes can be used for life. Manifestations that are an inherent part of a specifically coded anomaly are not coded separately. A corrected malformation is reported with a personal history code.

Guidelines I.C.17Congenital malformations and genetic disordersRead the official text

Use additional code

Add the listed code as a secondary code, if known.

Inherited from Q90 Down syndrome
  • code(s) to identify any associated degree of intellectual disabilities (F70-F79)

Code also

Two codes may be needed to describe the condition. This note gives no sequencing order.

Inherited from Q90 Down syndrome
  • associated physical condition(s), such as atrioventricular septal defect (Q21.2-)

Excludes2

Not included here. Both codes may be reported if the patient has both conditions.

Also from chapter/block level (2 notes)
Inherited from Q90–Q99 Chromosomal abnormalities, not elsewhere classified
  • mitochondrial metabolic disorders (E88.4-)
Inherited from Chapter 17 Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders
  • inborn errors of metabolism (E70-E88)

Care settings

How CMS programs treat this code. These are CMS claim edits and list entries, not coverage or eligibility rules.

Home Health Primary

Accepted as the primary (principal) diagnosis on a home health claim. The Home Health Grouper assigns it to the MMTA - Other clinical group.

Source: CMS Home Health Grouper Software v07.2.26, effective October 1, 2026

IPF Primary

IPF MS-DRG adjustment. A principal diagnosis of this code groups to this MS-DRG:

MS-DRGDescriptionFactor
884Organic disturbances & intellectual disabilities1.08
A principal diagnosis that groups to none of the 19 designated MS-DRGs gets no MS-DRG adjustment. Otherwise the claim still receives the federal per diem base rate and the other adjustments.

Source: CMS IPF PPS FY 2027 final rule (CMS-1847-F), Addendum A; code lists from the CMS MS-DRG Definitions Manual v44; effective for discharges on or after October 1, 2026

Notes

Also from chapter/block level (1 note)
Inherited from Chapter 17 Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders
  • Codes from this chapter are not for use on maternal records

Alphabetic Index terms

Terms the official Alphabetic Index lists for this code. 5 entries