H40.0 – Glaucoma suspect
ICD-10-CM 2027 diagnosis code · Glaucoma
ICD-10-CM code
H40.0
- Code
H40.0(claims format:H400)- Description
- Glaucoma suspect
- 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 H40.0
H40.0 is a header code and cannot be used on claims. Choose the most specific code:
- H40.00 – Preglaucoma, unspecifiedHeader (more codes below)
- H40.01 – Open angle with borderline findings, low riskHeader (more codes below)
- H40.02 – Open angle with borderline findings, high riskHeader (more codes below)
- H40.03 – Anatomical narrow angleHeader (more codes below)
- H40.04 – Steroid responderHeader (more codes below)
- H40.05 – Ocular hypertensionHeader (more codes below)
- H40.06 – Primary angle closure without glaucoma damageHeader (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
- H40.1 – Open-angle glaucomaHeader
- 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 H40.0?
H40.0 is the ICD-10-CM code for glaucoma suspect, in the block H40-H42 (Glaucoma).
Is H40.0 a billable code?
No. H40.0 is a header code with more specific child codes; report one of the billable codes listed above.
What category does H40.0 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.