H40.9
Billable codeUnspecified glaucoma
The ICD-10 code for unspecified glaucoma is H40.9.
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.
- •As a general rule, code to the highest level of specificity supported by the documentation in the medical record.
Related codes in this category
- H40.0Glaucoma suspectnon-billable header
- H40.1Open-angle glaucomanon-billable header
- H40.2Primary angle-closure glaucomanon-billable header
- H40.3Glaucoma secondary to eye traumanon-billable header
- H40.4Glaucoma secondary to eye inflammationnon-billable header
- H40.5Glaucoma secondary to other eye disordersnon-billable header
- H40.6Glaucoma secondary to drugsnon-billable header
- H40.8Other glaucomanon-billable header
- H40.9Unspecified glaucoma
ICD-9-CM equivalent
Informational only — GEM mappings are approximate, not guaranteed one-to-one equivalents. Verify before use in billing.
- 3659
Associated MS-DRGs
H40.9 can serve as the principal diagnosis for these Medicare Severity Diagnosis-Related Groups.
Informational only — actual DRG assignment also depends on procedures, complications/comorbidities (CC/MCC), discharge status, and payer-specific rules not reflected here.