| T78.40 | Allergy, unspecified | NON-BILLABLE CODE |
| T78.40XA | Allergy, unspecified, initial encounter | BILLABLE CODE |
| T78.40XD | Allergy, unspecified, subsequent encounter | BILLABLE CODE |
| T78.40XS | Allergy, unspecified, sequela | BILLABLE CODE |
| T78.41 | Arthus phenomenon | NON-BILLABLE CODE |
| T78.41XA | Arthus phenomenon, initial encounter | BILLABLE CODE |
| T78.41XD | Arthus phenomenon, subsequent encounter | BILLABLE CODE |
| T78.41XS | Arthus phenomenon, sequela | BILLABLE CODE |
| T78.49 | Other allergy | NON-BILLABLE CODE |
| T78.49XA | Other allergy, initial encounter | BILLABLE CODE |
| T78.49XD | Other allergy, subsequent encounter | BILLABLE CODE |
| T78.49XS | Other allergy, sequela | BILLABLE CODE |
