H40.121 (Low-tension glaucoma, right eye) compared with H40.129 (Low-tension glaucoma, unspecified eye), from the official CMS tabular data. H40.121 and H40.129 code the same condition on opposite sides.
Same condition; these differ only in which side is documented.
These codes share a category and title and differ only in the side affected. The documentation decides which applies, and a bilateral code is reported only where the code set provides one.
Source: ICD-10-CM tabular list (laterality variant derived from the code title)
Same condition, opposite side. H40.121 and H40.129 name the same condition on opposite sides of the body.
Same category and title, differing only in which side is affected — the documentation decides which one applies, and a bilateral code is reported only where the code set provides one.
| H40.121Low-tension glaucoma, right eye | H40.129Low-tension glaucoma, unspecified eye | |
|---|---|---|
| Billing status | Non-billable header Report instead: H40.1210, H40.1211, H40.1212, H40.1213, H40.1214 | Non-billable header Report instead: H40.1290, H40.1291, H40.1292, H40.1293, H40.1294 |
| Classification | H00-H59 — Diseases of the Eye and Adnexa (H00-H59) | H00-H59 — Diseases of the Eye and Adnexa (H00-H59) |
| Definition | Low-tension glaucoma, right eye is a non-billable ICD-10-CM category code (H40.121). | Low-tension glaucoma, unspecified eye is a non-billable ICD-10-CM category code (H40.129). |
| 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 | One of the following 7th characters is to be assigned to each code in subcategory H40.12 to designate the stage of glaucoma |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources