H40
ICD-10Non-billable categoryGlaucoma
Official ICD-10-CM descriptor (FY2026)
Glaucoma
H40 is a category heading, not a billable code. CMS does not accept it on a claim; report one of the more specific codes beneath it.
Excludes1
Not coded here. An Excludes1 code should never be reported at the same time as the code above it.
- absolute glaucoma (H44.51-)
- congenital glaucoma (Q15.0)
- traumatic glaucoma due to birth injury (P15.3)
More specific codes under H40
- H40.0Glaucoma suspectcategory
- H40.1Open-angle glaucomacategory
- H40.2Primary angle-closure glaucomacategory
- H40.3Glaucoma secondary to eye traumacategory
- H40.4Glaucoma secondary to eye inflammationcategory
- H40.5Glaucoma secondary to other eye disorderscategory
- H40.6Glaucoma secondary to drugscategory
- H40.8Other glaucomacategory
- H40.9Unspecified glaucoma
Where this code sits
- Block
- Glaucoma (H40-H42)
Krasyn AI Coder
Get code suggestions automatically as you type notes. Free for 50 analyses.
Install for Chrome — freeSource
ICD-10-CM FY2026. Centers for Medicare & Medicaid Services (CMS) / National Center for Health Statistics (NCHS), “2026 ICD-10-CM Code Descriptions in Tabular Order” (icd10cm_order_2026.txt). Download the original file from cms.gov. Public domain (US Government work). Descriptors, billable flags and instructional notes on this page are reproduced from that file without modification. Krasyn adds no clinical guidance.