| S00.521 | Blister (nonthermal) of lip | NON-BILLABLE CODE |
| S00.521A | Blister (nonthermal) of lip, initial encounter | BILLABLE CODE |
| S00.521D | Blister (nonthermal) of lip, subsequent encounter | BILLABLE CODE |
| S00.521S | Blister (nonthermal) of lip, sequela | BILLABLE CODE |
| S00.522 | Blister (nonthermal) of oral cavity | NON-BILLABLE CODE |
| S00.522A | Blister (nonthermal) of oral cavity, initial encounter | BILLABLE CODE |
| S00.522D | Blister (nonthermal) of oral cavity, subsequent encounter | BILLABLE CODE |
| S00.522S | Blister (nonthermal) of oral cavity, sequela | BILLABLE CODE |
