Mark Sittig, MD
Radiation Oncology Physician · Nashville, TN
Mark Sittig, MD is a radiation oncology physician with a practice address in Nashville, Tennessee, and NPI 1275951519, issued on Apr 3, 2014. Check the license (Tennessee 59257, as entered in NPPES) on the Tennessee Board of Medical Examiners; the Medicare figures below come from public CMS files.
- Name
- Mark Sittig
- Credential
- MD
- Primary taxonomy
- Radiation Oncology Physician 2085R0001X
- License number
- 59257 TN
Self-reported in NPPES; status is on the state search - Practice location
- 2004 Hayes St Ste LL15, Nashville, TN 37203
- Phone
- (615) 284-7785
- Enumerated
- Apr 3, 2014
- Record last updated
- Feb 25, 2026
- Fax
- (615) 284-7791
- Medicaid IDs
- 7100617580 KY
Q051113 TN - Medicare enrollment
- Enrolled (PECOS I20190914000197); accepts Medicare assignment
- Medical or professional school
- Tulane University School Of Medicine, 2014
- Entity
- Type 1 · individual
8 nearest radiation oncology physician records → All 132 in Tennessee → Look up another NPI →
Verify Mark Sittig in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersTennessee Board of Medical Examiners
Search for license 59257Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
1% more Medicare Part D claims than the average radiation oncology physician in 2024
136 Medicare Part D claims for 61 beneficiaries, against an average of 134 among the 4,851 providers of this specialty who prescribed in Part D.
Most prescribed
- Tamsulosin Hcl46 claims
- Oxybutynin Chloride Er18 claims
- Gabapentin14 claims
- Mometasone Furoate12 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $711.47
6 payments; by number, the most common kind was food and beverage; the largest payer was Janssen Scientific Affairs, LLC. The 3,275 providers of this specialty with any payment received $1,897.85 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through 3 group practices
- Lebanon Radiation Oncology Center, LLCLebanon, TN
- Tennessee Oncology PLLCSmyrna, TN
- Urology Associates PCNashville, TN
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mark Sittig among 132 radiation oncology physician records in Tennessee
Mark Sittig, MD is one of 132 radiation oncology physician records with a practice address in Tennessee. 83% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2014, is newer than 79% of them.
- NPI issued2014 · 79% of these records are older, 17% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 74% of these records are
- Graduated2014 · median 2005 among the 98 with a school on file
- Record last updated2026 · 52% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2085R0001X and a Tennessee practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Radiation Oncology Physician providers in Tennessee
There are 132 radiation oncology physician records in Tennessee.
All 132 in Tennessee → Every provider in Nashville → Radiation Oncology Physician nationwide →
The 8 radiation oncology physician records with the nearest ZIP codes
- Katherine Castle, M.D.Nashville, TN 372031336561539
- James Gray, M.D.Nashville, TN 372031841219938
- Julian Heitz, MDNashville, TN 372031437133139
- Andrew Kennedy, MDNashville, TN 372031467491019
- Casey Lipscomb, MDNashville, TN 372031861609331
- Eleanor Osborne, M.D.Nashville, TN 372031154687499
- Scott Strickler, MDNashville, TN 372031043744477
- Marion Bolin, M.D.Nashville, TN 372051952330672
Common questions
What is Mark Sittig, MD's NPI number?
Mark Sittig, MD's National Provider Identifier (NPI) is 1275951519, issued on Apr 3, 2014. An NPI identifies a provider in billing; it is not a license.
Where is Mark Sittig, MD located?
The NPPES record lists a practice address at 2004 Hayes St Ste LL15, Nashville, TN, 37203. Phone: (615) 284-7785. Providers update this record themselves, so call before visiting.
How can I verify Mark Sittig, MD's license?
NPPES lists Tennessee license number 59257, as entered by the provider. Search the Tennessee Board of Medical Examiners at https://www.tn.gov/health/licensure/me.html. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Mark Sittig, MD prescribe under Medicare Part D?
In 2024, Mark Sittig, MD had 136 Medicare Part D claims for 61 beneficiaries; the average among radiation oncology physician prescribers was 134. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.