Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Mark Sittig, MD

Individual provider Radiation Oncology Physician · NPI 1275951519

Mark Sittig, MD is a 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

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