ICD-10-CM 2027 diagnosis code

H16Keratitis

Not billable — use a more specific code

H16 is a header code, so it can't be reported by itself. Choose one of the 7 more specific codes beneath it.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About H16

H16 is the ICD-10-CM diagnosis code for keratitis. It belongs to block H15-H22 (disorders of sclera, cornea, iris and ciliary body) and chapter 7 (diseases of the eye and adnexa). It is a header code, so it can't be reported by itself; one of its 7 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: H16.0 (ulcer), H16.1 (conjunctivitis), H16.2 (keratoconjunctivitis), H16.3 (keratitis), H16.4 (neovascularization), H16.8 (keratitis) and H16.9 (keratitis).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Specific codes under H16

Notes that apply from higher levels

Instructions written at a parent level also apply to H16.

Broader instructions also apply from Chapter 7: Diseases of the eye and adnexa.

Code history

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

FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
No changes since FY2016.

Common questions about H16

Is H16 billable?: No. H16 is a header code. Report one of its more specific subcodes instead.