ICD-10-CM 2027 diagnosis code

B30Viral conjunctivitis

Not billable — use a more specific code

B30 is a header code, so it can't be reported by itself. Choose one of the 6 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 B30

B30 is the ICD-10-CM diagnosis code for viral conjunctivitis. It belongs to block B25-B34 (other viral diseases) and chapter 1 (certain infectious and parasitic diseases). It is a header code, so it can't be reported by itself; one of its 6 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: B30.0 (adenovirus), B30.1 (adenovirus), B30.2 (pharyngoconjunctivitis), B30.3 ((enteroviral)), B30.8 (conjunctivitis) and B30.9 (unspecified).

Don't report B30 together with the conditions in its Excludes1 note: herpesviral [herpes simplex] ocular disease (B00.5) and ocular zoster (B02.3).

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 B30

Coding notes

Excludes1Not coded here — never report together with this code

herpesviral [herpes simplex] ocular disease (B00.5)
ocular zoster (B02.3)

Notes that apply from higher levels

Instructions written at a parent level also apply to B30.

Broader instructions also apply from Chapter 1: Certain infectious and parasitic diseases.

Codes whose notes reference B30

H10.23Excludes1

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 B30

Is B30 billable?: No. B30 is a header code. Report one of its more specific subcodes instead.