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ICD-10-CM 2027 diagnosis code

Q90.2Trisomy 21, translocation

✓ Billable / specificPOA exempt

Q90.2 is a valid, billable ICD-10-CM code for trisomy 21, translocation. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About Q90.2

Q90.2 is the ICD-10-CM diagnosis code for trisomy 21, translocation. It belongs to category Q90 (down syndrome), block Q90-Q99 (chromosomal abnormalities, not elsewhere classified) and chapter 17 (congenital malformations, deformations, chromosomal abnormalities, and genetic disorders). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within Q90 (down syndrome), Q90.2 is specifically for trisomy 21, translocation. Related codes cover trisomy 21, nonmosaicism (meiotic nondisjunction) (Q90.0), trisomy 21, mosaicism (mitotic nondisjunction) (Q90.1) and unspecified (Q90.9).

Use an additional code(s) to identify any associated degree of intellectual disabilities (F70-F79).

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

In MS-DRG v44.0, it is part of the grouping logic for DRG 884 (Organic Disturbances and Intellectual Disability, relative weight 1.6001), in MDC 19 (Mental Diseases and Disorders), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It is exempt from present-on-admission (POA) reporting, so no POA indicator is required.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 758.0 (Down's syndrome).

Notes that apply from higher levels

Instructions written at a parent level also apply to Q90.2.

› From Q90 Down syndrome
Use additional code
  • code(s) to identify any associated degree of intellectual disabilities (F70-F79)
Code also
  • associated physical condition(s), such as atrioventricular septal defect (Q21.2-)

Broader instructions also apply from Q90-Q99 Chromosomal abnormalities, not elsewhere classified and Chapter 17: Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders.

Alphabetic index entries

5 entries

Terms in the official ICD-10-CM index that lead to Q90.2.

MS-DRG v44.0 grouping

All DRGs →

Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.

ICD-9-CM equivalent

Converter →
  • 758.0Down's syndromeapproximate

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about Q90.2

Is Q90.2 billable?

Yes. Q90.2 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can Q90.2 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict Q90.2 as a principal diagnosis.

Is Q90.2 a CC or MCC?

No. Q90.2 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does Q90.2 group to?

Q90.2 is used in the MS-DRG v44.0 logic for MS-DRG 884 (Organic Disturbances and Intellectual Disability). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.

What is the ICD-9 code for Q90.2?

The CMS General Equivalence Mappings map Q90.2 to ICD-9-CM 758.0.