I15
Secondary hypertension
I15 is a non-billable ICD-10-CM code category for secondary hypertension. Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. The more specific codes under it are I15.0 Renovascular hypertension, I15.1 Hypertension secondary to other renal disorders, I15.2 Hypertension secondary to endocrine disorders, I15.8 Other secondary hypertension and 1 more. Its coding notes include a Use additional code instruction, a Code also instruction, 3 Excludes1 entries and 13 Excludes2 entries.
Guidelines tip
From the FY2027 Official Guidelines. ICD10Ref adds no rules of its own.
Secondary hypertension takes two codes: one for the underlying cause and one from category I15.
Use additional code
Add the listed code as a secondary code, if known.
Code also
Two codes may be needed to describe the condition. This note gives no sequencing order.
- underlying condition
Excludes1
Not coded here. The listed conditions generally should not be reported together.
- postprocedural hypertension (I97.3)
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
Also from chapter/block level (11 notes)
- hypertensive disease complicating pregnancy, childbirth and the puerperium (O10-O11, O13-O16)
- 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.-)