H40.9 – Unspecified glaucoma
ICD-10-CM 2027 diagnosis code · Glaucoma
ICD-10-CM code
H40.9
- Code
H40.9(claims format:H409)- Description
- Unspecified glaucoma
- Billable
- Yes – valid for HIPAA-covered transactions
- 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
Notes inherited from parent codes
Instructional notes at a category or block level apply to every code below it.
H40 – Glaucoma
Index terms for H40.9
Entries in the ICD-10-CM alphabetic index that lead to this code:
Related codes in H40
- H40.0 – Glaucoma suspectHeader
- 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
Frequently asked questions
What is ICD-10 code H40.9?
H40.9 is the ICD-10-CM code for unspecified glaucoma, in the block H40-H42 (Glaucoma).
Is H40.9 a billable code?
Yes. H40.9 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.
What category does H40.9 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.