Thomas Paul Marnejon, DO
Internal Medicine Physician · Youngstown, OH
Thomas Paul Marnejon, DO is an internal medicine physician with a practice address in Youngstown, Ohio, and NPI 1891898607, issued on Sep 7, 2006. Check the license (Ohio 34004912, as entered in NPPES) on the State Medical Board of Ohio; the Medicare figures below come from public CMS files.
- Name
- Thomas Paul Marnejon
- Credential
- DO
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 34004912 OH
Self-reported in NPPES; status is on the state search - Practice location
- 1001 Covington St, Youngstown, OH 44510
- Phone
- (330) 480-2616
- Enumerated
- Sep 7, 2006
- Record last updated
- Apr 13, 2019 (not updated in 7 years: call before relying on the address or phone)
- Fax
- (330) 480-7979
- Medicaid ID
- 0866013 OH
- Medicare enrollment
- Enrolled (PECOS I20100820000554); accepts Medicare assignment
- Medical or professional school
- Philadelphia College Of Osteopathic Medicine, 1987
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 5,277 in Ohio → Look up another NPI →
Also registered at 1001 Covington St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Thomas Paul Marnejon in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersState Medical Board of Ohio
Search for license 34004912Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
96% fewer Medicare Part D claims than the average internal medicine physician in 2024
129 Medicare Part D claims for 46 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
Most prescribed
- Warfarin Sodium13 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.
Bills Medicare through one group practice
- Mercy Health Physicians Youngstown, LLCYoungstown, OH
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Thomas Paul Marnejon among 5,277 internal medicine physician records in Ohio
Thomas Paul Marnejon, DO is one of 5,277 internal medicine physician records with a practice address in Ohio. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 13% of them.
- NPI issued2006 · 13% of these records are older, 55% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 65% of these records are
- Graduated1987 · median 2006 among the 3,414 with a school on file
- Record last updated2019 · 58% 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 Ohio practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
130 internal medicine physician records list a practice address in Youngstown
They are 130 of the 4,790 NPPES records with a practice address in Youngstown, and 5,277 internal medicine physician records in Ohio.
All 5,277 in Ohio → Every provider in Youngstown → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Maharabe Ariyaratne, MDYoungstown, OH 445101750734554
- Jon Arnott, MDYoungstown, OH 445101902897721
- Patrick Brine, M.D.Youngstown, OH 445101861703563
- Matthew Chakan, MDYoungstown, OH 445101629360516
- Novie Gonzales, M.D.Youngstown, OH 445101902250236
- Joanne Grace Greising, MDYoungstown, OH 445101043748874
- Arman Hemmat, MDYoungstown, OH 445101588021117
- Cynthia Kravec, MDYoungstown, OH 445101073618450
Common questions
What is Thomas Paul Marnejon, DO's NPI number?
Thomas Paul Marnejon, DO's National Provider Identifier (NPI) is 1891898607, issued on Sep 7, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Thomas Paul Marnejon, DO located?
The NPPES record lists a practice address at 1001 Covington St, Youngstown, OH, 44510. Phone: (330) 480-2616. Providers update this record themselves, so call before visiting.
How can I verify Thomas Paul Marnejon, DO's license?
NPPES lists Ohio license number 34004912, as entered by the provider. Search the State Medical Board of Ohio at https://elicense.ohio.gov/oh_verifylicense. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Thomas Paul Marnejon, DO prescribe under Medicare Part D?
In 2024, Thomas Paul Marnejon, DO had 129 Medicare Part D claims for 46 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.