| Membership Code | Concept Code | Description | Code System | Code System Version |
|---|---|---|---|---|
| B | B | beginning | ActRelationshipCheckpoint | 2.01.4 |
| E | E | end | ActRelationshipCheckpoint | 2.01.4 |
| S | S | entry | ActRelationshipCheckpoint | 2.01.4 |
| T | T | through | ActRelationshipCheckpoint | 2.01.4 |
| X | X | exit | ActRelationshipCheckpoint | 2.01.4 |