These disputes are further complicated by the fact that some of the original contracting parties may have contractually agreed to indemnify other parties.
If the service was covered by the policy, the insurance company was responsible for reimbursing or indemnifying the patient based on the provisions of the insurance contract (reimbursement benefits).
Depending on divisibility, cancellation merely extinguishes a vested claim of the insured, or even the insurer's basic obligation to indemnify the insured.
The principal, or "dominus", more fully "dominus negotiorum dominus rei gestae", is bound to indemnify the gestor for the expenses and liabilities incurred.