Is Q23.0 a billable ICD-10-CM code?

Yes. Q23.0 is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does Q23.0 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 Q23.0?

Q23.0 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.

Q23.0

Q23.0 — Congenital stenosis of aortic valve

Billable / specific codeICD-10-CMPOA exempt

Q23.0 is a billable, specific ICD-10-CM code for congenital stenosis of aortic valve. It is valid for submission on a claim.

Excludes1 — never code together

These conditions cannot occur together. Billing both on the same encounter is a denial.

congenital stenosis of aortic valve in hypoplastic left heart syndrome (Q23.4)
congenital subaortic stenosis (Q24.4)
supravalvular aortic stenosis (congenital) (Q25.3)

Inclusion terms

Alternative wordings a physician may use in the chart for this same code.

Congenital aortic atresia
Congenital aortic stenosis NOS

Other codes that can never be billed with Q23.0

These codes carry an Excludes1 note pointing at Q23.0. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading Q23.0 alone.

Q25.3Supravalvular aortic stenosis

Risk adjustment

Q23.0 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

Q23.0 is named in 26 Medicare coverage policies — 26 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
A52850Billing and Coding: Cardiac Catheterization and Coronary Angiography
A52868Billing and Coding: Transesophageal Echocardiography (TEE)
A54111Billing and Coding: Speech Language Pathology (SLP) Services: Communication Disorders

How Q23.0 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 Q23.0.

Atresia, atretic›aortic(orifice) (valve)
Stenosis, stenotic›aortic›congenital
Stenosis, stenotic›valve›congenital›aortic
Stricture›heart›valve›aortic
Stricture›valve›congenital›aortic
Anomaly, anomalous›heart›valve NEC›aortic›stenosis

Related codes at this level

Codes that share Q23. If Q23.0 is not quite right, the correct code is usually one of these.

Questions about Q23.0

Is Q23.0 a billable ICD-10-CM code?: Yes. Q23.0 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does Q23.0 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 Q23.0?: Q23.0 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.