I1A
Other hypertension
I1A is a non-billable ICD-10-CM code category for other hypertension. Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. The more specific code under it is I1A.0 Resistant hypertension. Its coding notes include a Use additional code instruction, 2 Excludes1 entries and 11 Excludes2 entries.
Guidelines tip
From the FY2027 Official Guidelines. ICD10Ref adds no rules of its own.
I1A.0 is an additional code, used when the provider documents resistant hypertension. The specific type of hypertension is sequenced first, if known.
Use additional code
Add the listed code as a secondary code, if known.
Excludes1
Not coded here. The listed conditions generally should not be reported together.
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.-)