| H18.40 | Unspecified corneal degeneration | BILLABLE CODE |
| H18.41 | Arcus senilis | NON-BILLABLE CODE |
| H18.411 | Arcus senilis, right eye | BILLABLE CODE |
| H18.412 | Arcus senilis, left eye | BILLABLE CODE |
| H18.413 | Arcus senilis, bilateral | BILLABLE CODE |
| H18.419 | Arcus senilis, unspecified eye | BILLABLE CODE |
| H18.42 | Band keratopathy | NON-BILLABLE CODE |
| H18.421 | Band keratopathy, right eye | BILLABLE CODE |
| H18.422 | Band keratopathy, left eye | BILLABLE CODE |
| H18.423 | Band keratopathy, bilateral | BILLABLE CODE |
| H18.429 | Band keratopathy, unspecified eye | BILLABLE CODE |
| H18.43 | Other calcerous corneal degeneration | BILLABLE CODE |
| H18.44 | Keratomalacia | NON-BILLABLE CODE |
| H18.441 | Keratomalacia, right eye | BILLABLE CODE |
| H18.442 | Keratomalacia, left eye | BILLABLE CODE |
| H18.443 | Keratomalacia, bilateral | BILLABLE CODE |
| H18.449 | Keratomalacia, unspecified eye | BILLABLE CODE |
| H18.45 | Nodular corneal degeneration | NON-BILLABLE CODE |
| H18.451 | Nodular corneal degeneration, right eye | BILLABLE CODE |
| H18.452 | Nodular corneal degeneration, left eye | BILLABLE CODE |
| H18.453 | Nodular corneal degeneration, bilateral | BILLABLE CODE |
| H18.459 | Nodular corneal degeneration, unspecified eye | BILLABLE CODE |
| H18.46 | Peripheral corneal degeneration | NON-BILLABLE CODE |
| H18.461 | Peripheral corneal degeneration, right eye | BILLABLE CODE |
| H18.462 | Peripheral corneal degeneration, left eye | BILLABLE CODE |
| H18.463 | Peripheral corneal degeneration, bilateral | BILLABLE CODE |
| H18.469 | Peripheral corneal degeneration, unspecified eye | BILLABLE CODE |
| H18.49 | Other corneal degeneration | BILLABLE CODE |
