Q87.40 — Marfan syndrome, unspecified
Q87.40 is a billable, specific ICD-10-CM code for marfan syndrome, unspecified. It is valid for submission on a claim.
Other codes that can never be billed with Q87.40
These codes carry an Excludes1 note pointing at Q87.40. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading Q87.40 alone.
Risk adjustment
Q87.40 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
Q87.40 is named in 8 Medicare coverage policies — 8 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A52868Billing and Coding: Transesophageal Echocardiography (TEE)
- A53060Billing and Coding: Ophthalmology: Extended Ophthalmoscopy and Fundus Photography
- A56580Billing and Coding: Computerized Axial Tomography (CT), Thorax
- A56625Billing and Coding: Echocardiography
How Q87.40 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 Q87.40.
- Syndrome›Beals
- Syndrome›Marfan
Code history
Q87.40 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 Q87.4. If Q87.40 is not quite right, the correct code is usually one of these.
Questions about Q87.40
- Is Q87.40 a billable ICD-10-CM code?
- Yes. Q87.40 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does Q87.40 sit in the tabular list?
- Congenital malformations, deformations and chromosomal abnormalities (Q00-QA0), in the block Other congenital malformations (Q80-Q89).