NPI age
20 years
Enumerated 2006-04-20
● Active
Type 1 · Individual
John M Willis, DO
Willis is 1 of 46 internal medicine providers in Mansfield and 1 of 12343 in Texas.
Primary specialty
Internal Medicine
Licensed in
TX
1 state
Status
Active
No deactivations on record
Last NPPES update
2022-03-23
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
1 state
12% of peers hold multiple states
Subspecialties
0
33% of peers hold subspecialties
NPI lifetime · 2006 → 2026
2006-04Enumerated in NPPES
2006
2026
Where they practice
Practice location
252 Matlock Rd Ste 130
Mansfield, TX 760634295
Mailing address
252 Matlock Rd Ste 130
Mansfield, TX 760634295
Additional practice locations
1 secondary location on file with NPPES.
Location 2
2800 E Broad St Ste 512
Mansfield, TX 760636417
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,...
Identifiers
| Type | Value | Notes |
|---|---|---|
| 05 (TX) | 129827510 | |
| 01 (TX) | 8X9688 | BLUE CROSS |
Practice context
Part of a multi-provider practice. 3 other active providers share this practice address in NPPES.
Recently enumerated nearby: 1 new internal medicine provider has been added in Mansfield in the last 180 days.
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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.
- Confirm payer enrollment if billing.NPI presence does not guarantee active enrollment with Medicare, Medicaid, or commercial payers.