H40.1 – Open-angle glaucoma
ICD-10-CM 2027 diagnosis code · Glaucoma
ICD-10-CM code
H40.1
- Code
H40.1(claims format:H401)- Description
- Open-angle 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
- Parent codes
- H40
Billable codes under H40.1
H40.1 is a header code and cannot be used on claims. Choose the most specific code:
- H40.10 – Unspecified open-angle glaucomaHeader (more codes below)
- H40.11 – Primary open-angle glaucomaHeader (more codes below)
- H40.12 – Low-tension glaucomaHeader (more codes below)
- H40.13 – Pigmentary glaucomaHeader (more codes below)
- H40.14 – Capsular glaucoma with pseudoexfoliation of lensHeader (more codes below)
- H40.15 – Residual stage of open-angle glaucomaHeader (more codes below)
Notes inherited from parent codes
Instructional notes at a category or block level apply to every code below it.
H40 – Glaucoma
Related codes in H40
- H40.0 – Glaucoma suspectHeader
- H40.2 – Primary angle-closure glaucomaHeader
- H40.3 – Glaucoma secondary to eye traumaHeader
- H40.4 – Glaucoma secondary to eye inflammationHeader
- H40.5 – Glaucoma secondary to other eye disordersHeader
- H40.6 – Glaucoma secondary to drugsHeader
- H40.8 – Other glaucomaHeader
- H40.9 – Unspecified glaucomaBillable
Frequently asked questions
What is ICD-10 code H40.1?
H40.1 is the ICD-10-CM code for open-angle glaucoma, in the block H40-H42 (Glaucoma).
Is H40.1 a billable code?
No. H40.1 is a header code with more specific child codes; report one of the billable codes listed above.
What category does H40.1 belong to?
It belongs to category H40 – Glaucoma.
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.