I15.9 Secondary hypertension, unspecified

Billable ICD-10-CM code, FY2026.

Applies from I15 Secondary hypertension

Excludes1 (never code together)

• postprocedural hypertension (I97.3)

Excludes2 (not included here)

• secondary hypertension involving vessels of brain (I60-I69)
• secondary hypertension involving vessels of eye (H35.0-)

Code also

• underlying condition

Risk adjustment (HCC)

• RxHCC V08: HCC 187 — Hypertension

MS-DRG index

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

Approximate ICD-9-CM (GEMs)

• 405.99 Other unspecified secondary hypertension (approximate)

Code annotations containing back-references to I15.9

Back-references to I15

• Type 1 Excludes: I12 Hypertensive chronic kidney disease ("secondary hypertension (I15.-)")
• Code Also: I16 Hypertensive crisis ("any identified hypertensive disease (I10-I15, I1A)")
• Code First: I1A.0 Resistant hypertension ("secondary hypertension (I15.-)")
• Use Additional: O10.4 Pre-existing secondary hypertension complicating pregnancy, childbirth and the puerperium ("code from I15 to identify the type of secondary hypertension")

Diagnosis Index entries for I15.9

• Hypertension, hypertensive (accelerated) (benign) (essential) (idiopathic) (malignant) (systemic) › secondary NEC

Nearby codes

• I15 Secondary hypertension
• I15.0 Renovascular hypertension
• I15.1 Hypertension secondary to other renal disorders
• I15.2 Hypertension secondary to endocrine disorders
• I15.8 Other secondary hypertension
• I15.9 Secondary hypertension, unspecified (this code)