Ronald P. Markos, MD
Gastroenterology Physician · Sellersville, PA
Ronald P. Markos, MD is a gastroenterology physician with a practice address in Sellersville, Pennsylvania, and NPI 1851399786, issued on Jul 13, 2005. Check the license (Pennsylvania MD041987L, as entered in NPPES) on the Pennsylvania Department of State (PALS); the Medicare figures below come from public CMS files.
- Name
- Ronald P. Markos
- Credential
- MD
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- MD041987L PA
Self-reported in NPPES; status is on the state search - Practice location
- 817 Lawn Ave, Sellersville, PA 18960
- Phone
- (215) 257-5071
- Enumerated
- Jul 13, 2005
- Record last updated
- Apr 27, 2012 (not updated in 14 years: call before relying on the address or phone)
- Fax
- (215) 257-1801
- Medicare enrollment
- Enrolled (PECOS I20100910000140); accepts Medicare assignment
- Medical or professional school
- Hahnemann University College Of Medicine, 1988
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 1,049 in Pennsylvania → Look up another NPI →
Also registered at 817 Lawn Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Maggie Cheung, MDGastroenterology Physician1689102295
- Jonathan Cohen, M.D.Infectious Disease Physician1972528115
- Matthew CulybaInternal Medicine Physician1295053379
- Christine Davis Mazenko, PA-CMedical Physician Assistant1619174380
- John Dobrota, M.D.Gastroenterology Physician1457350167
- Albert Driver, MDPulmonary Disease Physician1811973803
Verify Ronald P. Markos in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersPennsylvania Department of State (PALS)
Search for license MD041987LCheck the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.6 times the Medicare Part D claims of the average gastroenterology physician in 2024
2,090 Medicare Part D claims for 556 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 11% of claims.
Most prescribed
- Famotidine841 claims
- Omeprazole341 claims
- Pantoprazole Sodium172 claims
- Mesalamine79 claims
- Linzess42 claims
- Sulfasalazine40 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: $713.98
38 payments; by number, the most common kind was food and beverage; the largest payer was Abbvie Inc. The 13,350 providers of this specialty with any payment received $5,015.95 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 one group practice
- Regional Gastroenterology Associates OF Lancaster, Ltd.Sellersville, PA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Ronald P. Markos among 1,049 gastroenterology physician records in Pennsylvania
Ronald P. Markos, MD 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. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 86% newer
- In a Medicare fileYes · 85% of these records are
- In the CMS Doctors and Clinicians fileYes · 73% of these records are
- Graduated1988 · median 2003 among the 769 with a school on file
- Record last updated2012 · 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).
12 gastroenterology physician records list a practice address in Sellersville
They are 12 of the 788 NPPES records with a practice address in Sellersville, and 1,049 gastroenterology physician records in Pennsylvania.
All 1,049 in Pennsylvania → Every provider in Sellersville → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Michael Cassidy, M.D.Sellersville, PA 189601790707107
- Maggie Cheung, MDSellersville, PA 189601689102295
- Nathan Davis, DOSellersville, PA 189601912436510
- John Dobrota, M.D.Sellersville, PA 189601457350167
- Inki Hong, M.D.Sellersville, PA 189601043665557
- Keith Kearney, DOSellersville, PA 189601245396019
- Ira Kelberman, M.D.Sellersville, PA 189601255359055
- Frank Kucer, MDSellersville, PA 189601487653747
Common questions
What is Ronald P. Markos, MD's NPI number?
Ronald P. Markos, MD's National Provider Identifier (NPI) is 1851399786, issued on Jul 13, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Ronald P. Markos, MD located?
The NPPES record lists a practice address at 817 Lawn Ave, Sellersville, PA, 18960. Phone: (215) 257-5071. Providers update this record themselves, so call before visiting.
How can I verify Ronald P. Markos, MD's license?
NPPES lists Pennsylvania license number MD041987L, 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.
How much does Ronald P. Markos, MD prescribe under Medicare Part D?
In 2024, Ronald P. Markos, MD had 2,090 Medicare Part D claims for 556 beneficiaries; the average among gastroenterology physician prescribers was 811. 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.