Is Q20.9 a billable ICD-10-CM code?

Yes. Q20.9 is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does Q20.9 sit in the tabular list?

Congenital malformations, deformations and chromosomal abnormalities (Q00-QA0), in the block Congenital malformations of the circulatory system (Q20-Q28).

What cannot be coded together with Q20.9?

Q20.9 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above Q20.9 (Q20) and apply to it just the same.

Q20.9

Q20.9 — Congenital malformation of cardiac chambers and connections, unspecified

Billable / specific codeICD-10-CMPOA exempt

Q20.9 is a billable, specific ICD-10-CM code for congenital malformation of cardiac chambers and connections, unspecified. It is valid for submission on a claim.

Excludes1 inherited from the categories above Q20.9

These are not written on Q20.9, but they bind it: a note on a category applies to every code beneath it. Billing Q20.9 with anything listed here is a denial.

Written on Q20 — Congenital malformations of cardiac chambers and connections

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

Risk adjustment

Q20.9 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.

Medicare coverage

Q20.9 is named in 15 Medicare coverage policies — 15 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.

A52850Billing and Coding: Cardiac Catheterization and Coronary Angiography
A54111Billing and Coding: Speech Language Pathology (SLP) Services: Communication Disorders
A56451Billing and Coding: Cardiac Computed Tomography (CCT) and Coronary Computed Tomography Angiography (CCTA)
A56476Billing and Coding: Cardiac Radionuclide Imaging

How Q20.9 is indexed

Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to Q20.9.

Anomaly, anomalous›cardiac›chambers
Malformation›cardiac›chambers

Code history

Q20.9 has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.

Related codes at this level

Codes that share Q20. If Q20.9 is not quite right, the correct code is usually one of these.

Questions about Q20.9

Is Q20.9 a billable ICD-10-CM code?: Yes. Q20.9 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does Q20.9 sit in the tabular list?: Congenital malformations, deformations and chromosomal abnormalities (Q00-QA0), in the block Congenital malformations of the circulatory system (Q20-Q28).
What cannot be coded together with Q20.9?: Q20.9 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above Q20.9 (Q20) and apply to it just the same.