NPPES file of Aug 9, 2026

Mark Bertram Sostek, M.D.

Gastroenterology Physician · Radnor, PA

Mark Bertram Sostek, M.D. is a gastroenterology physician with a practice address in Radnor, Pennsylvania, and NPI 1902881329, issued on Dec 8, 2005. Check the license (Pennsylvania MD065050L, as entered in NPPES) on the Pennsylvania Department of State (PALS); the federal record below is the public data PlainDoctor holds for this provider.

Record from CMS NPPES, file of Aug 9, 2026 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1902881329
Name
Mark Bertram Sostek
Credential
M.D.
Primary taxonomy
Gastroenterology Physician 207RG0100X
License number
MD065050L PA
Self-reported in NPPES; status is on the state search
Practice location
250 King OF Prussia RD, Radnor, PA 19087
Phone
(610) 902-1544
Enumerated
Dec 8, 2005
Record last updated
Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). A record is not a license: verify it with the state board.
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8 nearest gastroenterology physician records → All 1,049 in Pennsylvania → Look up another NPI →

Also registered at 250 King OF Prussia RD

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Pamela Anger, AU.D. CCC-AAudiologist1861588535
  2. Emelia Bachman, MDReproductive Endocrinology Physician1932375078
  3. Steven Borislow, MDDiagnostic Radiology Physician1497782395
  4. Ashley Brogan, M.D.Cardiovascular Disease Physician1295094985
  5. Kristina Casadei, MDInternal Medicine Physician1669606026
  6. Nicole Czyzewski, DPTPhysical Therapist1043165616

Verify Mark Bertram Sostek in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersPennsylvania Department of State (PALS)
    Search for license MD065050L    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the Pennsylvania license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

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Mark Bertram Sostek among 1,049 gastroenterology physician records in Pennsylvania

Mark Bertram Sostek, M.D. is one of 1,049 gastroenterology physician records with a practice address in Pennsylvania. 85% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2005, is newer than 0% of them.

  • NPI issued2005 · 0% of these records are older, 86% newer
  • In a Medicare fileNo · 85% of these records are
  • In the CMS Doctors and Clinicians fileNo · 73% of these records are
  • Record last updated2007 · 63% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0100X and a Pennsylvania practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

4 gastroenterology physician records list a practice address in Radnor

They are 4 of the 240 NPPES records with a practice address in Radnor, and 1,049 gastroenterology physician records in Pennsylvania. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.

All 1,049 in Pennsylvania → Every provider in Radnor → Gastroenterology Physician nationwide →

The 8 gastroenterology physician records with the nearest ZIP codes

  1. Joanne Linevsky, MDRadnor, PA 190871467408633
  2. Robert Stein, M.D.Radnor, PA 190871376585208
  3. Erin Toto, M.D.Radnor, PA 190871740443290
  4. Philip Gilman, M.D.Havertown, PA 190831164487468
  5. Charles Hurwitz, DOHavertown, PA 190831730174723
  6. Mark Jacobs, MDHavertown, PA 190831013943885
  7. Jacques Khoury, M.D.Havertown, PA 190831427025360
  8. Rita Ritsema, MDHavertown, PA 190831982621629

Common questions

What is Mark Bertram Sostek, M.D.'s NPI number?

Mark Bertram Sostek, M.D.'s National Provider Identifier (NPI) is 1902881329, issued on Dec 8, 2005. An NPI identifies a provider in billing; it is not a license.

Where is Mark Bertram Sostek, M.D. located?

The NPPES record lists a practice address at 250 King OF Prussia RD, Radnor, PA, 19087. Phone: (610) 902-1544. Providers update this record themselves, so call before visiting.

How can I verify Mark Bertram Sostek, M.D.'s license?

NPPES lists Pennsylvania license number MD065050L, 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. An NPI identifies who bills; it is not a license.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

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.