I15.8 — Other secondary hypertension
I15.8 is a billable, specific ICD-10-CM code for other secondary hypertension. It is valid for submission on a claim.
Excludes1 inherited from the categories above I15.8
These are not written on I15.8, but they bind it: a note on a category applies to every code beneath it. Billing I15.8 with anything listed here is a denial.
Excludes2 inherited from the categories above I15.8
Also inherited, and the opposite of Excludes1: these conditions are not part of I15.8, but a patient can have both, so you may code both.
Other codes that can never be billed with I15.8
These codes carry an Excludes1 note pointing at I15.8. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading I15.8 alone.
- I12Hypertensive chronic kidney disease
Risk adjustment
I15.8 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
I15.8 is named in 10 Medicare coverage policies — 10 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A53026Billing and Coding: Bariatric Surgery Coverage
- A54923Billing and Coding: Bariatric Surgery for Treatment of Co-Morbidities Conditions Related to Morbid Obesity
- A56625Billing and Coding: Echocardiography
- A56625Billing and Coding: Echocardiography
How I15.8 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 I15.8.
- Hypertension, hypertensive›due to›specified disease NEC
- Hypertension, hypertensive›secondary NEC›specified NEC
Code history
I15.8 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 I15. If I15.8 is not quite right, the correct code is usually one of these.
Questions about I15.8
- Is I15.8 a billable ICD-10-CM code?
- Yes. I15.8 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does I15.8 sit in the tabular list?
- Diseases of the circulatory system (I00-I99), in the block Hypertensive diseases (I10-I1A).
- What cannot be coded together with I15.8?
- I15.8 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 I15.8 (I15) and apply to it just the same.