NPI Atlas

I16 – Hypertensive crisis

ICD-10-CM 2027 diagnosis code · Hypertensive diseases

Non-billable header

ICD-10-CM code I16

Code: I16 (claims format: I16)
Description: Hypertensive crisis
Billable: No – use a more specific code below
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 9. Diseases of the circulatory system (I00-I99)
Block: I10-I1A Hypertensive diseases

Billable codes under I16

I16 is a header code and cannot be used on claims. Choose the most specific code:

I16.0 – Hypertensive urgencyBillable
I16.1 – Hypertensive emergencyBillable
I16.9 – Hypertensive crisis, unspecifiedBillable

Notes for I16

Code also:

any identified hypertensive disease (I10-I15, I1A)

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

Block I10-I1A

Excludes1 (not coded here):

neonatal hypertension (P29.2)
primary pulmonary hypertension (I27.0)

Excludes2 (not included here):

hypertensive disease complicating pregnancy, childbirth and the puerperium (O10-O11, O13-O16)

Use additional code:

code to identify:
exposure to environmental tobacco smoke (Z77.22)
history of tobacco dependence (Z87.891)
occupational exposure to environmental tobacco smoke (Z57.31)
tobacco dependence (F17.-)
tobacco use (Z72.0)

Frequently asked questions

What is ICD-10 code I16?

I16 is the ICD-10-CM code for hypertensive crisis, in the block I10-I1A (Hypertensive diseases).

Is I16 a billable code?

No. I16 is a header code with more specific child codes; report one of the billable codes listed above.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.