I1A.0

ICD-10Billable

Resistant hypertension

Official ICD-10-CM descriptor (FY2026)

Resistant hypertension

I1A.0 is valid for submission on a claim — CMS flags it as a billable, specific code.

Inclusion terms

  • Apparent treatment resistant hypertension
  • Treatment resistant hypertension
  • True resistant hypertension

Code first

Sequence the underlying condition before this code.

  • specific type of existing hypertension, if known, such as:
  • essential hypertension (I10)
  • secondary hypertension (I15.-)

Where this code sits

Parent code
I1A

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Source

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.

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