| H55 | Nystagmus and other irregular eye movements | NON-BILLABLE CODE |
| H55.0 | Nystagmus | NON-BILLABLE CODE |
| H55.00 | Unspecified nystagmus | BILLABLE CODE |
| H55.01 | Congenital nystagmus | BILLABLE CODE |
| H55.03 | Visual deprivation nystagmus | BILLABLE CODE |
| H55.04 | Dissociated nystagmus | BILLABLE CODE |
| H55.09 | Other forms of nystagmus | BILLABLE CODE |
| H55.8 | Other irregular eye movements | NON-BILLABLE CODE |
| H55.81 | Deficient saccadic eye movements | BILLABLE CODE |
| H55.82 | Deficient smooth pursuit eye movements | BILLABLE CODE |
| H55.89 | Other irregular eye movements | BILLABLE CODE |
