THOMAS PAUL MARNEJON DO
NPI 1891898607
Internal Medicine in Youngstown, OH
About Thomas Paul Marnejon Do NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
THOMAS PAUL MARNEJON DO (NPI 1891898607) is an individual internal medicine provider in Youngstown, Ohio, licensed in Ohio (34004912) and active in the NPI registry since September 2006. He is enrolled in Medicare PECOS, is affiliated with St Elizabeth Youngstown Hospital, and is a graduate of Philadelphia College Of Osteopathic Medicine (1987).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 2
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Thomas Paul Marnejon Do is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
2Medicare enrollment records show Thomas Marnejon reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Youngstown, OH 44504
- Reassigned Medicare billing, Ohio enrollment
- 374 clinicians in this Medicare group
Akron, OH 44304
- Reassigned Medicare billing, Ohio enrollment
- 259 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 2
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
St Elizabeth Youngstown Hospital
Acute Care Hospitals · Youngstown, OHPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 44510 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
YOUNGSTOWN, OH 44510
YOUNGSTOWN, OH 44510
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Thomas Marnejon's NPI number?
The NPI number for Thomas Marnejon is 1891898607. It was assigned to this individual provider in the NPPES registry on September 7, 2006.
Where is Thomas Marnejon located?
Thomas Marnejon practices at 1001 Covington St, Youngstown, OH 44510. The listed phone number is (330) 480-2616.
What is Thomas Marnejon's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Thomas Marnejon enrolled in Medicare?
Yes. Thomas Marnejon is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Thomas Marnejon's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Thomas Marnejon reassigns Medicare benefits to 2 organizations: Mercy Health Physicians Youngstown, LLC (Youngstown, OH) and 4M Hospitalist Services, LLC (Akron, OH). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Thomas Marnejon's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Thomas Marnejon accept?
Health plans from Ambetter Health, Ambetter from Buckeye Health Plan, Ambetter from Meridian, Anthem Blue Cross and Blue Shield and Antidote Health Plan of Ohio, Inc. and 3 other insurers list Thomas Marnejon as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is Thomas Marnejon affiliated with any hospitals?
According to CMS data, Thomas Marnejon is affiliated with St Elizabeth Youngstown Hospital.
When was this NPI record last updated?
The NPPES record for Thomas Marnejon was last updated on April 13, 2019. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 7 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Thomas Paul Marnejon, DO · NPI 1891898607
Internal Medicine physician in Youngstown, Ohio. Individual provider, active in the CMS NPPES registry since September 7, 2006.
## Identity
- **NPI:** 1891898607 (Entity type: Individual)
- **Enumerated:** September 7, 2006
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** 34004912 (Ohio)
- **Sole proprietor:** No
## Practice location
- **Address:** 1001 COVINGTON ST, Youngstown, OH 44510-1617
- **Phone:** (330) 480-2616 · **Fax:** (330) 480-7979
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 2 organizations under Medicare reassignment (form CMS-855R): Mercy Health Physicians Youngstown, LLC (NPI 1154636066, Youngstown, OH); 4M Hospitalist Services, LLC (NPI 1508288531, Akron, OH) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Philadelphia College Of Osteopathic Medicine, class of 1987
## Record status
- **NPPES last updated:** April 13, 2019
- **Other identifiers:** Other H143790 (OH); Medicaid 0866013 (OH)
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Source: [NPI Profile](https://npiprofile.com/npi/1891898607) · Data from the CMS NPPES public registry.