Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Marc G Apple, MD

Individual provider Radiation Oncology Physician · NPI 1164422697

Marc G Apple, MD practises Radiation Oncology in Knoxville, Tennessee. Graduated from University of Miami, Lm Miller School of Medicine in 1990, 36 years ago. Practices with Indian River Health Services Inc, a 332-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Florida, Georgia, Indiana and Tennessee.

Years since qualifying
36
Trained at
University of Miami, Lm Miller School of Medicine
Licensed in
FL, GA, IN, TN
In the registry since
2005
Specialties on file
4
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

1451 Old Weisgarber Rd Ste 250
Knoxville, TN 37909
Phone: (865) 862-1625
Fax: (865) 321-4558
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 6274 Linton Blvd Ste 100, Delray Beach, FL 33484-6508 — (561) 323-6500

Specialties & licences

Radiation Oncology Physician (primary) Taxonomy 2085R0001X · Licence 63572 (TN)
Radiation Oncology Physician Taxonomy 2085R0001X · Licence 01048136A (IN)
Radiation Oncology Physician Taxonomy 2085R0001X · Licence 072738 (GA)
Radiation Oncology Physician Taxonomy 2085R0001X · Licence ME63028 (FL)

Record details

NPI number1164422697
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedJuly 27, 2005
Last updated in NPPESAugust 19, 2021
Certification dateAugust 19, 2021

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyRADIATION ONCOLOGY
Medical schoolUNIVERSITY OF MIAMI, LM MILLER SCHOOL OF MEDICINE
Graduated 1990 (36 years in practice)
Group practice Indian River Health Services Inc — 332 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients239
Services billed 2,206 a service is one billed item, such as a visit, a test or a procedure
Average patient age77

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Food and Beverage $237 3 payments · a meal or drink at a meeting or visit, not a fee

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician. Those with a page here are linked.

Colleagues at Indian River Health Services Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 332 clinicians in the practice; 12 are shown here.

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