Q20 — Congenital malformations of cardiac chambers and connections

Not billable

Is Q20 billable?

No — Q20 is a non-billable header code. Q20 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 9 billable codes beneath Q20.

Billable codes under this header

Q20 at a glance

Code	Q20
Description	Congenital malformations of cardiac chambers and connections
Billable	No — header code
Code set	ICD-10-CM FY2027
Valid for encounters	October 1, 2026 – September 30, 2027

Excludes1 — never code together

The conditions below can never be reported together with Q20 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.

dextrocardia with situs inversus (Q89.3)
mirror-image atrial arrangement with situs inversus (Q89.3)

Excludes2 — not included here — inherited from Chapter 17

The conditions below are not part of Q20, but a patient may have both at the same time. When documentation supports it, Q20 and the excluded code may both be reported.

inborn errors of metabolism (E70-E88)

What codes fall under Q20? (9)

How long has Q20 existed?

Q20 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.

Which codes are confused with Q20?

ICD-10-CM declares these codes mutually exclusive with Q20 — exactly one of each pair can be correct for a given encounter.

vs Q89.3Situs inversus