Q21.1 — Atrial septal defect

Not billable

Is Q21.1 billable?

No — Q21.1 is a non-billable header code. Q21.1 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 Q21.1.

Billable codes under this header

Q21.1 at a glance

Code	Q21.1
Description	Atrial septal defect
Billable	No — header code
Code set	ICD-10-CM FY2027
Valid for encounters	October 1, 2026 – September 30, 2027

Excludes2 — not included here

The conditions below are not part of Q21.1, but a patient may have both at the same time. When documentation supports it, Q21.1 and the excluded code may both be reported.

ostium primum atrial septal defect (type I) (Q21.20)

Excludes1 — never code together — inherited from Q21

The conditions below can never be reported together with Q21.1 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.

acquired cardiac septal defect (I51.0)

Excludes2 — not included here — inherited from Chapter 17

The conditions below are not part of Q21.1, but a patient may have both at the same time. When documentation supports it, Q21.1 and the excluded code may both be reported.

inborn errors of metabolism (E70-E88)

What codes fall under Q21.1? (8)

How long has Q21.1 existed?

Q21.1 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.

FY2023: Q21.1 stopped being billable

Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.