NPI age
20 years
Enumerated 2006-05-01
● Active
Type 1 · Individual
Mark W. Greenwell, M.D.
Greenwell is 1 of 5 internal medicine providers in Paris and 1 of 1582 in Texas.
Primary specialty
Internal Medicine
Plus 1 subspecialty
Licensed in
TX, OK
2 states
Status
Active
No deactivations on record
Last NPPES update
2023-04-20
Source: monthly bulk 2026-05
Sole proprietor
No
May be part of a larger org
How this provider compares
Across 1582 active internal medicine providers in Texas.
NPI age
20 years
↑ 2 yr above median (18 yr)
State licenses
2 states
Top 86% — 14% of peers are multi-state
Subspecialties
0
34% of peers hold subspecialties
NPI lifetime · 2006 → 2026
2006-05Enumerated in NPPES
2006
2026
Where they practice
Practice location
635 Stone Ave
Paris, TX 754609342
Mailing address
1133 Medical Dr
Tyler, TX 757012130
Additional practice locations
2 secondary locations on file with NPPES.
Location 2
1104 E Lincoln Rd
Idabel, OK 747457364
Location 3
105 Medical Cir Bldg 3
Sulphur Springs, TX 754822138
Specialties
-
Internal Medicine PrimaryAn internist who treats disorders of the kidney, high blood pressure, fluid and mineral balance and dialysis of body wastes when the kidneys do not function. This specialist consults with surgeons about kidney transplantation.
Identifiers
| Type | Value | Notes |
|---|---|---|
| 05 (OK) | 200452580 A | |
| 05 (TX) | 3058059-01 |
Multi-state credentialing: Licensed in 2 states. Useful context for credentialers building cross-state provider networks.
Practice context
Part of a multi-provider practice. 7 other active providers share this practice address in NPPES.
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- 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.
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