| Code | Display | Definition |
| day |
Day |
The calendar day containing the service. |
| session |
Session |
The clinical or billing session containing the service. |
| treatment-case |
Treatment case |
The treatment or billing case containing the service. |
| illness-case |
Illness case |
The illness episode containing the service. |
| physician-case |
Physician case |
The case formed by a patient and one physician. |
| quarter |
Quarter |
The calendar quarter containing the service. |
| calendar-year |
Calendar year |
The calendar year containing the service. |
| participation-year |
Participation year |
A year anchored to enrollment or contract participation. |
| lifetime |
Lifetime |
The complete known lifetime of the counting subject. |
| life-day |
Life day |
A day indexed from the patient's date of birth. |
| life-week |
Life week |
A week indexed from the patient's date of birth. |
| life-month |
Life month |
A month indexed from the patient's date of birth. |
| life-year |
Life year |
A year indexed from the patient's date of birth. |
| rolling-days |
Rolling days |
A parameterized number of days anchored to the service. |
| pregnancy |
Pregnancy |
The pregnancy episode containing the service. |
| treatment-week |
Treatment week |
A seven-day window indexed from the start of the treatment episode containing the service, independent of the calendar week boundary. |
| calendar-week |
Calendar week |
The calendar week containing the service, delimited by the week boundaries of the applicable calendar rather than by the treatment. |
| cycle-case |
Cycle case |
The treatment cycle containing the service, where care is organised as repeating cycles and each cycle counts separately. |
| reproduction-case |
Reproduction case |
The reproductive treatment case containing the service, spanning the measures that belong to one treatment attempt. |
| subsequent-quarter-after-anchor |
Subsequent quarter after anchor |
A calendar quarter that follows the quarter containing a declared anchor event. The direction is fixed by this concept: the window always lies after the anchor. Which event anchors the window is supplied as a parameter and is never part of this concept, and a scope qualifier used with this concept must not declare a conflicting direction. |
| service-occurrence |
Service occurrence |
A single billed occurrence (service line) of the service the rule references, so that the rule applies within each occurrence individually rather than within any calendar or case boundary. When the rule constrains an add-on service, the counted occurrence is the service line of the base service the add-on accompanies, never the add-on's own line. |
| billing-account |
Billing account |
The single billing account (claim document, for example a German Schein) containing the service, so that counting restarts with each account rather than at a calendar or case boundary. One treatment case may span several accounts, which is what distinguishes this window from the treatment case. |
