NPI age
20 years
Enumerated 2006-04-18
● Active
Type 1 · Individual
DR. Marc Demyun, MD
Demyun is 1 of 43 internal medicine providers in Greenville and 1 of 12343 in Texas.
Primary specialty
Internal Medicine
Plus 2 subspecialties
Licensed in
TX, MS
2 states
Status
Active
No deactivations on record
Last NPPES update
2025-09-08
Source: monthly bulk 2026-05
Sole proprietor
No
May be part of a larger org
How this provider compares
Across 12343 active internal medicine providers in Texas.
NPI age
20 years
↑ 3 yr above median (17 yr)
State licenses
2 states
Top 88% — 12% of peers are multi-state
Subspecialties
1
In the 33% of peers with subspecialties
NPI lifetime · 2006 → 2026
2006-04Enumerated in NPPES
2006
2026
Where they practice
Practice location
4001 Ridgecrest Rd Ste A
Greenville, TX 754026143
Mailing address
2810 E Trinity Mills Rd Ste 130
Carrollton, TX 750062339
Additional practice locations
2 secondary locations on file with NPPES.
Location 2
4215 Joe Ramsey Blvd E
Greenville, TX 754017852
Location 3
2810 E Trinity Mills Rd Ste 130
Carrollton, TX 750062339
Specialties
-
Internal Medicine PrimaryA physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer,...
-
Family MedicineFamily Medicine is the medical specialty which is concerned with the total health care of the individual and the family. It is the specialty in breadth which integrates the biological, clinical, and behavioral sciences. The scope of...
Identifiers
| Type | Value | Notes |
|---|---|---|
| 01 (TX) | P8236 | TEXAS LICENSE |
Multi-state credentialing: Licensed in 2 states. Useful context for credentialers building cross-state provider networks.
Practice context
Part of a multi-provider practice. 5 other active providers share this practice address in NPPES.
Recently enumerated nearby: 3 new internal medicine providers have been added in Greenville in the last 180 days.
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Request a quote →How to verify this provider
- Confirm the NPI on NPPES.The CMS registry is the system of record. Open NPPES →
- Check the state license is currently active.State licensing boards publish current status; NPPES does not.
- Confirm payer enrollment if billing.NPI presence does not guarantee active enrollment with Medicare, Medicaid, or commercial payers.