Whenever your hospital based pathologist receives a Cyto specimen from another hospital inpatient, the billing is based who performed what part of services. Your hospital bills TC of the Cyto specimen on your hospital inpatient, but other hospital inpatients are not inpatients for you when you recieve specimen. So, in this case you can bill PC for your pathologist's interpretation of the slide.
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TC: Preparation of the slide, involving tissue or cells that a pathologist will interpret.
PC: Pathologist's interpretation of the slide is the professional component (PC) services.
Note:-
The billing is based on who provided what part of the services, ultimately it should not be double billing of the same component.
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At the same time, this kind of services are provided normally as part of arranged services. When the hospital obtains laboratory tests for outpatients under arrangements with clinical laboratories or other hospital laboratories, only the hospital can bill for the arranged services.