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

Mark Sittig, MD

Individual provider Radiation Oncology Physician · NPI 1275951519

Mark Sittig, MD practises Radiation Oncology in Nashville, Tennessee. Graduated from Tulane University School of Medicine in 2014, 12 years ago. Practices with Lebanon Radiation Oncology Center, LLC, a 9-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Tennessee.

Years since qualifying
12
Trained at
Tulane University School of Medicine
Licensed in
TN
In the registry since
2014
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

2004 Hayes St Ste LL15
Nashville, TN 37203-2647
Phone: (615) 284-7785
Fax: (615) 284-7791
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 2801 Charlotte Ave, Nashville, TN 37209-4035 — (615) 250-9200

Specialties & licences

Radiation Oncology Physician (primary) Taxonomy 2085R0001X · Licence 59257 (TN)

Record details

NPI number1275951519
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedApril 3, 2014
Last updated in NPPESFebruary 25, 2026
Certification dateFebruary 25, 2026

Medicare enrollment

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

Medicare specialtyRADIATION ONCOLOGY
Medical schoolTULANE UNIVERSITY SCHOOL OF MEDICINE
Graduated 2014 (12 years in practice)
Group practice Lebanon Radiation Oncology Center, Llc — 9 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations3 on file with Medicare

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 patients227
Services billed 5,142 a service is one billed item, such as a visit, a test or a procedure
Average patient age75

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 $499 6 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.

Colleagues at Lebanon Radiation Oncology Center, LLC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice.

Other providers in Nashville