25 CFR § 900.192 - What employees are covered by FTCA for medical-related claims?
(a) Permanent employees;
(b) Temporary employees;
(c) Persons providing services without compensation in carrying out a contract;
(d) Persons required because of their employment by a self-determination contractor to serve non-IHS beneficiaries (even if the services are provided in facilities not owned by the contractor); and
(e) Federal employees assigned to the contract.