I1A.0 Resistant hypertension

Billable ICD-10-CM code, FY2026.

Applicable to

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

Code first

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

Risk adjustment (HCC)

• RxHCC V08: HCC 187 — Hypertension

MS-DRG index

Defines the logic of DRG(s) 304-305 in MDC 05.

Code annotations containing back-references to I1A.0

Back-references to I1A

• Use Additional: G31.84 Mild cognitive impairment of uncertain or unknown etiology ("hypertension (I10-I1A)")
• Code Also: I16 Hypertensive crisis ("any identified hypertensive disease (I10-I15, I1A)")
• Code Also: Z15.3 Genetic susceptibility to kidney disease (", if applicable, hypertension (I10-I1A)")

Diagnosis Index entries for I1A.0

• Hypertension, hypertensive (accelerated) (benign) (essential) (idiopathic) (malignant) (systemic) › resistant (apparent treatment) (treatment) (true)

Nearby codes

• I1A Other hypertension
• I1A.0 Resistant hypertension (this code)