| T70.20 | Unspecified effects of high altitude | NON-BILLABLE CODE |
| T70.20XA | Unspecified effects of high altitude, initial encounter | BILLABLE CODE |
| T70.20XD | Unspecified effects of high altitude, subsequent encounter | BILLABLE CODE |
| T70.20XS | Unspecified effects of high altitude, sequela | BILLABLE CODE |
| T70.29 | Other effects of high altitude | NON-BILLABLE CODE |
| T70.29XA | Other effects of high altitude, initial encounter | BILLABLE CODE |
| T70.29XD | Other effects of high altitude, subsequent encounter | BILLABLE CODE |
| T70.29XS | Other effects of high altitude, sequela | BILLABLE CODE |
