I16.9 Hypertensive crisis, unspecified

Billable ICD-10-CM code, FY2026. Acts as a Complication or Comorbidity (CC) as a secondary diagnosis.

Applies from I16 Hypertensive crisis

Code also

• any identified hypertensive disease (I10-I15, I1A)

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)

• 401.9 Unspecified essential hypertension (approximate)

Code annotations containing back-references to I16.9

Back-references to I16

• Use Additional: G90.81 Serotonin syndrome ("hypertensive crisis (I16.-)")

Diagnosis Index entries for I16.9

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

Nearby codes

• I16 Hypertensive crisis
• I16.0 Hypertensive urgency
• I16.1 Hypertensive emergency
• I16.9 Hypertensive crisis, unspecified (this code)