ICD-10-CM 2027 diagnosis code

H10Conjunctivitis

Not billable — use a more specific code

H10 is a header code, so it can't be reported by itself. Choose one of the 8 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 H10

H10 is the ICD-10-CM diagnosis code for conjunctivitis. It belongs to block H10-H11 (disorders of conjunctiva) 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 8 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: H10.0 (conjunctivitis), H10.1 (conjunctivitis), H10.2 (conjunctivitis), H10.3 (conjunctivitis), H10.4 (conjunctivitis), H10.5 (blepharoconjunctivitis), H10.8 (conjunctivitis) and H10.9 (conjunctivitis).

Don't report H10 together with the conditions in its Excludes1 note: keratoconjunctivitis (H16.2-).

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 H10

Coding notes

Excludes1Not coded here — never report together with this code

keratoconjunctivitis (H16.2-)

Notes that apply from higher levels

Instructions written at a parent level also apply to H10.

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 H10

Is H10 billable?: No. H10 is a header code. Report one of its more specific subcodes instead.