ICD-10-CM 2027 diagnosis code

I16Hypertensive crisis

Not billable — use a more specific code

I16 is a header code, so it can't be reported by itself. Choose one of the 3 more specific codes beneath it.

Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS, effective October 1, 2026. Updated September 29, 2026. About our data

About I16

I16 is the ICD-10-CM diagnosis code for hypertensive crisis. It belongs to block I10-I1A (hypertensive diseases) and chapter 9 (diseases of the circulatory system). It is a header code, so it can't be reported by itself; one of its 3 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: I16.0 (urgency), I16.1 (emergency) and I16.9 (unspecified).

It was added in FY2017, effective October 1, 2016.

Specific codes under I16

Coding notes

Code alsoTwo codes may be needed; sequencing depends on circumstances

any identified hypertensive disease (I10-I15, I1A)

Notes that apply from higher levels

Instructions written at a parent level also apply to I16.

Broader instructions also apply from I10-I1A Hypertensive diseases and Chapter 9: Diseases of the circulatory system.

Codes whose notes reference I16

G90.81Use additional code

Code history

2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027

FY2017 (effective 10/1/2016): Added
No changes since FY2017.

Common questions about I16

Is I16 billable?: No. I16 is a header code. Report one of its more specific subcodes instead.