I15
ICD-10Non-billable categorySecondary hypertension
Official ICD-10-CM descriptor (FY2026)
Secondary hypertension
I15 is a category heading, not a billable code. CMS does not accept it on a claim; report one of the more specific codes beneath it.
Excludes1
Not coded here. An Excludes1 code should never be reported at the same time as the code above it.
- postprocedural hypertension (I97.3)
Excludes2
Not included here. The condition is not part of this code, but a patient may have both, and both codes may be reported together.
- secondary hypertension involving vessels of brain (I60-I69)
- secondary hypertension involving vessels of eye (H35.0-)
Code also
Two codes may be needed; sequencing depends on the reason for the encounter.
- underlying condition
More specific codes under I15
Where this code sits
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ICD-10-CM FY2026. Centers for Medicare & Medicaid Services (CMS) / National Center for Health Statistics (NCHS), “2026 ICD-10-CM Code Descriptions in Tabular Order” (icd10cm_order_2026.txt). Download the original file from cms.gov. Public domain (US Government work). Descriptors, billable flags and instructional notes on this page are reproduced from that file without modification. Krasyn adds no clinical guidance.