H40 – Glaucoma
ICD-10-CM 2027 diagnosis code · Glaucoma
ICD-10-CM code
H40
- Code
H40(claims format:H40)- Description
- Glaucoma
- Billable
- No – use a more specific code below
- Valid for
- Dates of service October 1, 2026 – September 30, 2027 (FY2027)
- Chapter
- 7. Diseases of the eye and adnexa (H00-H59)
- Block
- H40-H42 Glaucoma
Billable codes under H40
H40 is a header code and cannot be used on claims. Choose the most specific code:
- H40.0 – Glaucoma suspectHeader (more codes below)
- H40.1 – Open-angle glaucomaHeader (more codes below)
- H40.2 – Primary angle-closure glaucomaHeader (more codes below)
- H40.3 – Glaucoma secondary to eye traumaHeader (more codes below)
- H40.4 – Glaucoma secondary to eye inflammationHeader (more codes below)
- H40.5 – Glaucoma secondary to other eye disordersHeader (more codes below)
- H40.6 – Glaucoma secondary to drugsHeader (more codes below)
- H40.8 – Other glaucomaHeader (more codes below)
- H40.9 – Unspecified glaucomaBillable
Notes for H40
Frequently asked questions
What is ICD-10 code H40?
H40 is the ICD-10-CM code for glaucoma, in the block H40-H42 (Glaucoma).
Is H40 a billable code?
No. H40 is a header code with more specific child codes; report one of the billable codes listed above.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.