H40.10
Billable codeUnspecified open-angle glaucoma
The ICD-10 code for unspecified open-angle glaucoma is H40.10.
Clinical notes
7th character definitions
These definitions specify what each valid 7th-character value means for codes in this category.
- [object Object]
7th character note
This category requires a 7th character to indicate additional clinical detail (e.g. encounter type: initial, subsequent, sequela). The code is incomplete without it.
- One of the following 7th characters is to be assigned to code H40.10 to designate the stage of glaucoma
Documentation support
General coding-documentation guidance — not a substitute for payer-specific requirements or professional coding judgment.
- •This code describes an unspecified presentation. If the medical record documents a more specific detail (e.g. laterality, type, or affected site), a more specific sibling code should be used instead — see Related codes below.
- •This category requires a 7th character. Documentation should clearly indicate the episode of care (initial encounter, subsequent encounter, or sequela).
- •As a general rule, code to the highest level of specificity supported by the documentation in the medical record.
Related codes in this category
- H40.11Primary open-angle glaucomanon-billable header
- H40.12Low-tension glaucomanon-billable header
- H40.13Pigmentary glaucomanon-billable header
- H40.14Capsular glaucoma with pseudoexfoliation of lensnon-billable header
- H40.15Residual stage of open-angle glaucomanon-billable header
- H40.10Unspecified open-angle glaucoma