ICD-10-CM 2027
ICD-10 code for open angle glaucoma
From the official ICD-10-CM alphabetic index entry “Glaucoma › open angle”. Page updated September 29, 2026.
About coding open angle glaucoma
The ICD-10-CM code for open angle glaucoma is H40.10 (Unspecified open-angle glaucoma). The official index lists 5 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on H40.10.
Within H40.1, choose H40.10 (Unspecified open-angle glaucoma) only when documentation doesn't support a more specific option: primary open-angle glaucoma (H40.11), Low-tension glaucoma (H40.12), pigmentary glaucoma (H40.13), capsular glaucoma with pseudoexfoliation of lens (H40.14) and residual stage of open-angle glaucoma (H40.15).
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.
More specific open angle glaucoma codes (official index)
Common questions about open angle glaucoma ICD-10 codes
What is the ICD-10 code for open angle glaucoma?
- H40.10 — Unspecified open-angle glaucoma (a header code; report a more specific subcode). More specific codes apply when the documentation supports them: H40.11, H40.14, H40.12, H40.13 and others below.
What is the ICD-10 code for primary open angle glaucoma?
- H40.11 — Primary open-angle glaucoma (header code; choose a more specific subcode).
Is H40.10 billable?
- No. H40.10 is a header code. Report one of its more specific subcodes instead.