| S00.421 | Blister (nonthermal) of right ear | NON-BILLABLE CODE |
| S00.421A | Blister (nonthermal) of right ear, initial encounter | BILLABLE CODE |
| S00.421D | Blister (nonthermal) of right ear, subsequent encounter | BILLABLE CODE |
| S00.421S | Blister (nonthermal) of right ear, sequela | BILLABLE CODE |
| S00.422 | Blister (nonthermal) of left ear | NON-BILLABLE CODE |
| S00.422A | Blister (nonthermal) of left ear, initial encounter | BILLABLE CODE |
| S00.422D | Blister (nonthermal) of left ear, subsequent encounter | BILLABLE CODE |
| S00.422S | Blister (nonthermal) of left ear, sequela | BILLABLE CODE |
| S00.429 | Blister (nonthermal) of unspecified ear | NON-BILLABLE CODE |
| S00.429A | Blister (nonthermal) of unspecified ear, initial encounter | BILLABLE CODE |
| S00.429D | Blister (nonthermal) of unspecified ear, subsequent encounter | BILLABLE CODE |
| S00.429S | Blister (nonthermal) of unspecified ear, sequela | BILLABLE CODE |
