42 C.F.R. § 424.507
(a) Conditions for payment of claims for ordered covered imaging and clinical laboratory services and items of durable medical equipment, prosthetics, orthotics, and supplies (DMEPOS)—(1) Ordered covered imaging, clinical laboratory services, and DMEPOS item claims. To receive payment for ordered imaging, clinical laboratory services, and DMEPOS items (excluding home health services described in § 424.507(b), and Part B drugs), a provider or supplier must meet all of the following requirements:
(iii) The physician or, when permitted, other eligible professional, as defined in § 424.506(a), who ordered the item or service must—
(C) (1) Be enrolled in Medicare in an approved status; or
(2) Have validly opted-out of the Medicare program.
(iv) If the item or service is ordered by—
(A) An unlicensed resident (as defined in § 413.75), or by a non-enrolled licensed resident (as defined in § 413.75), the claim must identify a teaching physician, who must be enrolled in Medicare in an approved status, as follows:
(1) As the ordering supplier.
(2) By his or her legal name.
(3) By his/her NPI.
(B) A licensed resident (as defined in § 413.75), he or she must have a provisional license or be otherwise permitted by State law, where the resident is enrolled in an approved graduate medical education program, to practice or order such items and services, the claim must identify by legal name and NPI the—
(1) Resident, who is enrolled in Medicare in an approved status to order; or
(2) Teaching physician, who is enrolled in Medicare in an approved status.
(2) Part B beneficiary claims. To receive payment for ordered covered items and services listed at § 424.507(a), a beneficiary's claim must meet all of the following requirements:
(i) The physician or, when permitted, other eligible professional (as defined § 424.506(a)) who ordered the item or service must—
(B) (1) Be enrolled in Medicare in an approved status; or
(2) Have validly opted out of the Medicare program.
(ii) If the item or service is ordered by—
(A) An unlicensed resident (as defined in § 413.75) or a non-enrolled licensed resident, (as defined in § 413.75) the claim must identify a teaching physician, who must be enrolled in Medicare in an approved status as follows:
(1) As the ordering supplier.
(2) By his or her legal name.
(B) A licensed resident (as defined in § 413.75), he or she must have a provisional license or are otherwise permitted by State law, where the resident is enrolled in an approved graduate medical education program, to practice or to order such items and services, the claim must identify by legal name the—
(1) Resident, who is enrolled in Medicare in an approved status to order; or
(2) Teaching physician, who is enrolled in Medicare in an approved status.
(b) Conditions for payment of claims for covered home health and hospice services. To receive payment for covered Part A or Part B home health services or for covered hospice services, a provider's home health or hospice services claim must meet all of the following requirements:
(1) The ordering/certifying physician for hospice or home health services, or, for home health services, the ordering/certifying physician assistant, nurse practitioner, or clinical nurse specialist working in accordance with State law, must meet all of the following requirements:
(iii)
(2) If the services were ordered/certified by—
(i) An unlicensed resident, as defined in § 413.75, or by a non-enrolled licensed resident, as defined in § 413.75, the claim must identify a teaching physician who must be enrolled in Medicare in an approved status—
(ii) A licensed resident (as defined in § 413.75), he or she must have a provisional license or are otherwise permitted by State law, where the resident is enrolled in an approved graduate medical education program, to practice or to order/certify such items and services, the claim must identify by legal name and NPI the—
[77 FR 25317, Apr. 27, 2012, as amended at 85 FR 27625, May 8, 2020; 88 FR 51199, Aug. 2, 2023]