Q91 — Trisomy 18 and Trisomy 13

Not billable

Is Q91 billable?

No — Q91 is a non-billable header code. Q91 groups more specific codes and cannot be submitted on a claim. A valid ICD-10-CM code must be reported at the highest level of specificity available in its branch. Select one of the 8 billable codes beneath Q91.

Billable codes under this header

Q91 at a glance

Code	Q91
Description	Trisomy 18 and Trisomy 13
Billable	No — header code
Code set	ICD-10-CM FY2027
Valid for encounters	October 1, 2026 – September 30, 2027

Excludes2 — not included here — inherited from Chapter 17

The conditions below are not part of Q91, but a patient may have both at the same time. When documentation supports it, Q91 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 Q91, but a patient may have both at the same time. When documentation supports it, Q91 and the excluded code may both be reported.

mitochondrial metabolic disorders (E88.4-)

What codes fall under Q91? (8)

How long has Q91 existed?

Q91 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.