| S90.541 | External constriction, right ankle | NON-BILLABLE CODE |
| S90.541A | External constriction, right ankle, initial encounter | BILLABLE CODE |
| S90.541D | External constriction, right ankle, subsequent encounter | BILLABLE CODE |
| S90.541S | External constriction, right ankle, sequela | BILLABLE CODE |
| S90.542 | External constriction, left ankle | NON-BILLABLE CODE |
| S90.542A | External constriction, left ankle, initial encounter | BILLABLE CODE |
| S90.542D | External constriction, left ankle, subsequent encounter | BILLABLE CODE |
| S90.542S | External constriction, left ankle, sequela | BILLABLE CODE |
| S90.549 | External constriction, unspecified ankle | NON-BILLABLE CODE |
| S90.549A | External constriction, unspecified ankle, initial encounter | BILLABLE CODE |
| S90.549D | External constriction, unspecified ankle, subsequent encounter | BILLABLE CODE |
| S90.549S | External constriction, unspecified ankle, sequela | BILLABLE CODE |
