H40.20 – Unspecified primary angle-closure glaucoma
ICD-10-CM 2027 diagnosis code · Glaucoma
- Code
H40.20(claims format:H4020)- Description
- Unspecified primary angle-closure 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 › H40.2
Billable codes under H40.20
H40.20 is a header code and cannot be used on claims. Choose the most specific code:
- H40.20X0 – Unspecified primary angle-closure glaucoma, stage unspecifiedBillable
- H40.20X1 – Unspecified primary angle-closure glaucoma, mild stageBillable
- H40.20X2 – Unspecified primary angle-closure glaucoma, moderate stageBillable
- H40.20X3 – Unspecified primary angle-closure glaucoma, severe stageBillable
- H40.20X4 – Unspecified primary angle-closure glaucoma, indeterminate stageBillable
7th character values
Codes in this category need a 7th character to describe the encounter or episode of care (use placeholder X for empty positions).
| Character | Meaning |
|---|---|
0 | stage unspecified |
1 | mild stage |
2 | moderate stage |
3 | severe stage |
4 | indeterminate stage |
Notes for H40.20
- One of the following 7th characters is to be assigned to code H40.20 to designate the stage of glaucoma
Notes inherited from parent codes
Instructional notes at a category or block level apply to every code below it.
H40 – Glaucoma
H40.2 – Primary angle-closure glaucoma
Index terms for H40.20
Entries in the ICD-10-CM alphabetic index that lead to this code:
Related codes in H40.2
Frequently asked questions
What is ICD-10 code H40.20?
H40.20 is the ICD-10-CM code for unspecified primary angle-closure glaucoma, in the block H40-H42 (Glaucoma).
Is H40.20 a billable code?
No. H40.20 is a header code with more specific child codes; report one of the billable codes listed above.
What category does H40.20 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.