I15.9
Secondary hypertension, unspecified
HCC risk adjustment mapping
RxHCC V08
Hypertension
Coding notes
Excludes 1 never coded together · Excludes 2 may co-exist
certain conditions originating in the perinatal period (P04-P96) certain infectious and parasitic diseases (A00-B99) complications of pregnancy, childbirth and the puerperium (O00-O9A) congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99) endocrine, nutritional and metabolic diseases (E00-E88) injury, poisoning and certain other consequences of external causes (S00-T88) neoplasms (C00-D49) symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94) systemic connective tissue disorders (M30-M36) transient cerebral ischemic attacks and related syndromes (G45.-)
Official Guidelines for I15.9
FY 2026 ›Sections that reference I15.9
- I.C.9.a.1)Hypertension with Heart Disease
… The applicable hypertension code I10, Essential (primary) hypertension, or a code from category I15, Secondary hypertension, should be assigned. …
- I.C.9.a.6)Hypertension, Secondary
… Two codes are required: one to identify the underlying etiology and one from category I15 to identify the hypertension. …
- I.C.9.a.5)Hypertensive Retinopathy
Subcategory H35.0, Background retinopathy and retinal vascular changes, should be used along with a code from categories I10 – I15, in the Hypertensive diseases section, to include the systemic hypertension. …
- I.C.9.a.8)Hypertension, Controlled
… Assign the appropriate code from categories I10-I15, Hypertensive diseases.
- I.C.9.a.9)Hypertension, Uncontrolled
… In either case, assign the appropriate code from categories I10-I15, Hypertensive diseases.
- I.C.9.a.10)Hypertensive Crisis
… Code also any identified hypertensive disease (I10- I15). …
Sections whose FY 2026 text names I15.9, its I15 category, or a range containing it — the chapter guidance above is the authoritative source.
Find I15.9 in the alphabetic index
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