H40.12 is the authoritative medical code for Low-tension glaucoma. This classification is used in medical billing and clinical recording to specify the clinical criteria for low-tension glaucoma (ICD-10-CM H40.12), ensuring healthcare documentation aligns with 2026 federal coding standards.
Billing Status: NO. This is a clinician non-billable / parent hierarchy grouping in the ICD-10-CM system.
Official Registry Overview & Definition
Low-tension glaucoma is a non-billable ICD-10-CM category code H40.12. A more specific billable subcode must be selected for claims submission. Excludes1 (not coded here): absolute glaucoma H44.51-; congenital glaucoma Q15.0; traumatic glaucoma due to birth injury P15.3. 7th character: One of the following 7th characters is to be assigned to each code in subcategory H40.12 to designate the stage of glaucoma.
Official Tabular Instructional Notes
Sequencing, inclusion, and exclusion notes published for H40.12 in the official ICD-10-CM tabular list.
Excludes1 — Not Coded Here
Conditions that can never be reported with this code; the two are mutually exclusive.
- absolute glaucoma H44.51-
- congenital glaucoma Q15.0
- traumatic glaucoma due to birth injury P15.3
Frequently Asked Questions (FAQ) & Clinical Guidance
Can H40.12 be billed directly?
No. H40.12 (Low-tension glaucoma) is a non-billable ICD-10-CM category code. A more specific billable subcode must be selected based on clinical documentation.
Does H40.12 require a 7th character?
Yes. One of the following 7th characters is to be assigned to each code in subcategory H40.12 to designate the stage of glaucoma; 0: stage unspecified; 1: mild stage; 2: moderate stage; 3: severe stage; 4: indeterminate stage.
What can't be coded together with H40.12?
Per official ICD-10-CM Excludes1 instructions, H40.12 must not be reported together with: absolute glaucoma (H44.51-); congenital glaucoma (Q15.0); traumatic glaucoma due to birth injury (P15.3).
Nearest Codes in This Family
Official ICD-10-CM classifications closest to H40.12 in its code family, with their registry titles.
- H40.121 — Low-tension glaucoma, right eye
- H40.1210 — Low-tension glaucoma, right eye, stage unspecified
- H40.1211 — Low-tension glaucoma, right eye, mild stage
- H40.1212 — Low-tension glaucoma, right eye, moderate stage
- H40.1213 — Low-tension glaucoma, right eye, severe stage
- H40.1214 — Low-tension glaucoma, right eye, indeterminate stage
- H40.122 — Low-tension glaucoma, left eye
- H40.1220 — Low-tension glaucoma, left eye, stage unspecified
- H40.1221 — Low-tension glaucoma, left eye, mild stage
- H40.1222 — Low-tension glaucoma, left eye, moderate stage
View all 24 codes in the H40.121 family