ICD-10-CM 2027 diagnosis code
H40.221Chronic angle-closure glaucoma, right eye
H40.221 is a header code, so it can't be reported by itself. Choose one of the 5 more specific codes beneath it and add the required 7th character.
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 H40.221
H40.221 is the ICD-10-CM diagnosis code for chronic angle-closure glaucoma, right eye. It belongs to category H40 (glaucoma), block H40-H42 (glaucoma) 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 5 subcodes must be used instead.
Within H40.22 (chronic angle-closure glaucoma), H40.221 is specifically for chronic angle-closure glaucoma, right eye. Related codes cover left eye (H40.222), bilateral (H40.223) and unspecified eye (H40.229).
Codes in this range require a 7th character: 0 for stage unspecified, 1 for mild stage, 2 for moderate stage, 3 for severe stage and 4 for indeterminate stage. Use placeholder "X" characters to fill any empty positions before the 7th character.
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
7th character
One of the following 7th characters is to be assigned to each code in subcategory H40.22 to designate the stage of glaucoma
Notes that apply from higher levels
Instructions written at a parent level also apply to H40.221.
› From H40 Glaucoma
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 H40.221
Is H40.221 billable?
- No. H40.221 is a header code. Report one of its more specific subcodes instead.