| H18.30 | Unspecified corneal membrane change | BILLABLE CODE |
| H18.31 | Folds and rupture in Bowman's membrane | NON-BILLABLE CODE |
| H18.311 | Folds and rupture in Bowman's membrane, right eye | BILLABLE CODE |
| H18.312 | Folds and rupture in Bowman's membrane, left eye | BILLABLE CODE |
| H18.313 | Folds and rupture in Bowman's membrane, bilateral | BILLABLE CODE |
| H18.319 | Folds and rupture in Bowman's membrane, unspecified eye | BILLABLE CODE |
| H18.32 | Folds in Descemet's membrane | NON-BILLABLE CODE |
| H18.321 | Folds in Descemet's membrane, right eye | BILLABLE CODE |
| H18.322 | Folds in Descemet's membrane, left eye | BILLABLE CODE |
| H18.323 | Folds in Descemet's membrane, bilateral | BILLABLE CODE |
| H18.329 | Folds in Descemet's membrane, unspecified eye | BILLABLE CODE |
| H18.33 | Rupture in Descemet's membrane | NON-BILLABLE CODE |
| H18.331 | Rupture in Descemet's membrane, right eye | BILLABLE CODE |
| H18.332 | Rupture in Descemet's membrane, left eye | BILLABLE CODE |
| H18.333 | Rupture in Descemet's membrane, bilateral | BILLABLE CODE |
| H18.339 | Rupture in Descemet's membrane, unspecified eye | BILLABLE CODE |
