Q28.9 — Congenital malformation of circulatory system, unspecified
Q28.9 is a billable, specific ICD-10-CM code for congenital malformation of circulatory system, unspecified. It is valid for submission on a claim.
Excludes1 inherited from the categories above Q28.9
These are not written on Q28.9, but they bind it: a note on a category applies to every code beneath it. Billing Q28.9 with anything listed here is a denial.
Excludes2 inherited from the categories above Q28.9
Also inherited, and the opposite of Excludes1: these conditions are not part of Q28.9, but a patient can have both, so you may code both.
Other codes that can never be billed with Q28.9
These codes carry an Excludes1 note pointing at Q28.9. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading Q28.9 alone.
- I67.1Cerebral aneurysm, nonruptured
Risk adjustment
Q28.9 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
Q28.9 is named in 4 Medicare coverage policies — 4 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A54111Billing and Coding: Speech Language Pathology (SLP) Services: Communication Disorders
- A56781Billing and Coding: Transthoracic Echocardiography (TTE)
- A56781Billing and Coding: Transthoracic Echocardiography (TTE)
- A57306Billing and Coding: Transthoracic Echocardiography (TTE)
How Q28.9 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 Q28.9.
- Agenesis›circulatory system, part NOS
- Anomaly, anomalous›circulatory system
- Circulation›embryonic
- Circulation›heart, incomplete
- Deformity›cardiovascular system, congenital
- Embryonic›circulation
- Embryonic›heart
- Malformation›circulatory system
- Circulation›defective›congenital
- Defect, defective›circulation›congenital
- Defect, defective›circulation›newborn
- Disease, diseased›cardiovascular›congenital
Code history
Q28.9 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 Q28. If Q28.9 is not quite right, the correct code is usually one of these.
Questions about Q28.9
- Is Q28.9 a billable ICD-10-CM code?
- Yes. Q28.9 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does Q28.9 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 Q28.9?
- Q28.9 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 Q28.9 (Q28) and apply to it just the same.