Mark Thomas Upton, MD
Internal Medicine Physician · Philadelphia, PA
Mark Thomas Upton, MD is an internal medicine physician with a practice address in Philadelphia, Pennsylvania, and NPI 1366733008, issued on Apr 28, 2011. Check the license (Pennsylvania MD449578, as entered in NPPES) on the Pennsylvania Department of State (PALS); the Medicare figures below come from public CMS files.
- Name
- Mark Thomas Upton
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- MD449578 PA
Self-reported in NPPES; status is on the state search - Practice location
- 3900 Woodland Ave, Philadelphia, PA 19104
- Phone
- (215) 823-5800
- Enumerated
- Apr 28, 2011
- Record last updated
- Jul 9, 2026
- Medicare enrollment
- Enrolled (PECOS I20250516002819); accepts Medicare assignment
- Medical or professional school
- University Of Toledo College Of Medicine, 2011
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 7,300 in Pennsylvania → Look up another NPI →
Also registered at 3900 Woodland Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Kate Acker, CRNPNurse Practitioner1922876408
- Tiffany Adeleke, PHARMDPharmacist1194334011
Verify Mark Thomas Upton in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersPennsylvania Department of State (PALS)
Search for license MD449578Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Bills Medicare through one group practice
- Solace Health Medical Group IncBaltimore, MD
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mark Thomas Upton among 7,300 internal medicine physician records in Pennsylvania
Mark Thomas Upton, MD is one of 7,300 internal medicine physician records with a practice address in Pennsylvania. 78% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2011, is newer than 52% of them.
- NPI issued2011 · 52% of these records are older, 45% newer
- In a Medicare fileYes · 78% of these records are
- In the CMS Doctors and Clinicians fileYes · 58% of these records are
- Graduated2011 · median 2008 among the 4,208 with a school on file
- Record last updated2026 · 56% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Pennsylvania practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
1,855 internal medicine physician records list a practice address in Philadelphia
They are 1,855 of the 42,849 NPPES records with a practice address in Philadelphia, and 7,300 internal medicine physician records in Pennsylvania.
All 7,300 in Pennsylvania → Every provider in Philadelphia → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Amy Behrman, MDPhiladelphia, PA 191041851331870
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- John Bruza, MDPhiladelphia, PA 191041093758310
- Jill Clemmer, MDPhiladelphia, PA 191041477594562
- John Flamma, MDPhiladelphia, PA 191041477500296
- Kevin Fosnocht, MDPhiladelphia, PA 191041003842709
- William Gilhool, DOPhiladelphia, PA 191041982606919
- Bruce Kinosian, MDPhiladelphia, PA 191041871536177
Common questions
What is Mark Thomas Upton, MD's NPI number?
Mark Thomas Upton, MD's National Provider Identifier (NPI) is 1366733008, issued on Apr 28, 2011. An NPI identifies a provider in billing; it is not a license.
Where is Mark Thomas Upton, MD located?
The NPPES record lists a practice address at 3900 Woodland Ave, Philadelphia, PA, 19104. Phone: (215) 823-5800. Providers update this record themselves, so call before visiting.
How can I verify Mark Thomas Upton, MD's license?
NPPES lists Pennsylvania license number MD449578, as entered by the provider. Search the Pennsylvania Department of State (PALS) at https://www.pals.pa.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
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.