Other laboratory and X-ray services means professional and technical laboratory and radiological services--
(a) Ordered and provided by or under the direction of a physician or other licensed practioner of the healing arts within the scope of his practice as defined by State law or ordered by a physician but provided by referral laboratory;
(b) Provided in an office or similar facility other than a hospital outpatient department or clinic; and
(c) Furnished by a laboratory that meets the requirements of part 493 of this chapter. [46 FR 42672, Aug. 24, 1981, as amended at 57 FR 7135, Feb. 28, 1992]