Q90.0 — Trisomy 21, nonmosaicism (meiotic nondisjunction)
Is Q90.0 billable?
Yes — Q90.0 is billable for FY2027. Q90.0 is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. Q90.0 may be submitted for encounters from October 1, 2026 through September 30, 2027.
Q90.0 at a glance
| Code | Q90.0 |
|---|---|
| Description | Trisomy 21, nonmosaicism (meiotic nondisjunction) |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Which MS-DRGs does Q90.0 group to?
Q90.0 sits in MDC 19 and helps define the logic of 1 MS-DRG (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.
- 884Organic Disturbances and Intellectual Disabilitymedical
How is Q90.0 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to Q90.0. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Down syndrome › meiotic nondisjunction
- Trisomy › 21 › meiotic nondisjunction (syndrome)
- Syndrome › trisomy › 21 › meiotic nondisjunction
Use additional code — inherited from Q90
Report an additional code alongside Q90.0 to fully describe the condition. Q90.0 is sequenced first.
- code(s) to identify any associated degree of intellectual disabilities (F70-F79)
Excludes2 — not included here — inherited from Chapter 17
The conditions below are not part of Q90.0, but a patient may have both at the same time. When documentation supports it, Q90.0 and the excluded code may both be reported.
- inborn errors of metabolism (E70-E88)
Excludes2 — not included here — inherited from Q90-Q99
The conditions below are not part of Q90.0, but a patient may have both at the same time. When documentation supports it, Q90.0 and the excluded code may both be reported.
- mitochondrial metabolic disorders (E88.4-)
Code also — inherited from Q90
Two codes may be needed to describe the condition fully. Whether Q90.0 is sequenced first depends on the reason for the encounter.
- associated physical condition(s), such as atrioventricular septal defect (Q21.2-)
How long has Q90.0 existed?
Q90.0 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.