FQHC Billing

I am new to the FQHC billing world. The HRSA guidelines state:
Covered Scope of Services
A basic concept in a discussion of covered services under both the RHC and FQHC programs is the theory of “core” services. The set of services constituting core services was first defined in the Rural Health Clinics Act (Public Law 95-210) in 1977. This set of core services has been expanded by amendments to that Act. As of the date of publication of this manual, the definition is as follows:
• Physician services, including required physician supervision of PAs, NPs, and CNMs
• Services and supplies furnished as incident to physician professional services;
• Services of PAs, NPs and CNMs
• Services of clinical psychologists and clinical social workers (when providing diagnosis and treatment of mental illness)
• Services and supplies furnished as incident to professional services provided by PAs, NPs, CNMs, clinical psychologists, and clinical social workers
• Visiting nurse services on a part time or intermittent basis to homebound patients (limited to areas in which there is a designated shortage of home health agencies).

Can anyone define this statement? Services and supplies furnished as incident to physician professional services;

What services are considered "incedent to" physician professional services? Or, what services should be included in my clinc rate?

re: FQHC Billing

I have a list of procedure codes if you like that will be paid through part A at the deim rate and which all goes under part b as normal physician charges.