DR. MARC DEMYUN MD
NPI 1952366684
Internal Medicine in Greenville, TX
About Dr. Marc Demyun Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. MARC DEMYUN MD (NPI 1952366684) is an individual internal medicine provider in Greenville, Texas, licensed in Texas (P8236) and active in the NPI registry since April 2006. He is enrolled in Medicare PECOS, is affiliated with Texoma Medical Center, and maintains 2 additional practice locations.
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Locations 2
Other Identifiers 1
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
Dr. Marc Demyun Md 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
6Medicare enrollment records show Marc Demyun reassigns Medicare billing to 6 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Denison, TX 75020
- Reassigned Medicare billing, Texas enrollment
- 112 clinicians in this Medicare group
Greenville, TX 75401
- Reassigned Medicare billing, Texas enrollment
- 74 clinicians in this Medicare group
Forney, TX 75126
- Reassigned Medicare billing, Texas enrollment
- 10 clinicians in this Medicare group
Irving, TX 75063
- Reassigned Medicare billing, Texas enrollment
- 8 clinicians in this Medicare group
Dallas, TX 75230
- Reassigned Medicare billing, Texas enrollment
- 486 clinicians in this Medicare group
Fort Worth, TX 76109
- Reassigned Medicare billing, Texas enrollment
- 19 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 4
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 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Texoma Medical Center
Acute Care Hospitals · Denison, TXHunt Regional Medical Center
Acute Care Hospitals · Greenville, TXPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 75402 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Reported Quality Measures
Other Providers at the Same Location NPPES 5
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
GREENVILLE, TX 75402
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 Marc Demyun's NPI number?
The NPI number for Marc Demyun is 1952366684. It was assigned to this individual provider in the NPPES registry on April 18, 2006.
Where is Marc Demyun located?
Marc Demyun practices at 4001 Ridgecrest Rd Ste A, Greenville, TX 75402. The listed phone number is (903) 453-2850.
What is Marc Demyun's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Marc Demyun enrolled in Medicare?
Yes. Marc Demyun 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 Marc Demyun's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Marc Demyun reassigns Medicare benefits to 6 organizations: Hospitalist Medicine Physicians Of Texas - Burnet PLLC (Denison, TX), Hunt Memorial Hospital District (Greenville, TX), Medconmd1 PLLC (Forney, TX), Precision Health Clinic PLLC (Irving, TX), Questcare Hospitalists PLLC (Dallas, TX) and 1 more organization, listed in the Medicare section above. 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 Marc Demyun's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Marc Demyun accept?
Health plans from Ambetter Health, Ambetter from Arizona Complete Health, Ambetter from Arkansas Health & Wellness, Ambetter from Louisiana Healthcare Connections and Ambetter from Superior HealthPlan and 7 other insurers list Marc Demyun 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 Marc Demyun affiliated with any hospitals?
According to CMS data, Marc Demyun is affiliated with Texoma Medical Center and Hunt Regional Medical Center.
When was this NPI record last updated?
The NPPES record for Marc Demyun was last updated on September 8, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 months 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.
# Dr. Marc Demyun, MD · NPI 1952366684
Internal Medicine physician in Greenville, Texas. Individual provider, active in the CMS NPPES registry since April 18, 2006.
## Identity
- **NPI:** 1952366684 (Entity type: Individual)
- **Enumerated:** April 18, 2006
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** P8236 (Texas)
- **Sole proprietor:** No
## Practice location
- **Address:** 4001 RIDGECREST RD STE A, Greenville, TX 75402-6143
- **Phone:** (903) 453-2850 · **Fax:** (903) 453-2859
## 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:** 6 organizations under Medicare reassignment (form CMS-855R): Hospitalist Medicine Physicians Of Texas - Burnet PLLC (NPI 1265275887, Denison, TX); Hunt Memorial Hospital District (NPI 1598750721, Greenville, TX); Medconmd1 PLLC (NPI 1811437841, Forney, TX); Precision Health Clinic PLLC (NPI 1942040407, Irving, TX); Questcare Hospitalists PLLC (NPI 1265441620, Dallas, TX); and 1 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 1997
## Record status
- **NPPES last updated:** September 8, 2025
- **Other identifiers:** Other P8236 (TX)
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Source: [NPI Profile](https://npiprofile.com/npi/1952366684) · Data from the CMS NPPES public registry.