NPI age
20 years
Enumerated 2006-04-19
● Active
Type 1 · Individual
DR. John Frederick Wissinger, MD
Wissinger is 1 of 2 internal medicine providers in El Campo and 1 of 12343 in Texas.
Primary specialty
Internal Medicine
Licensed in
TX
1 state
Status
Active
No deactivations on record
Last NPPES update
2012-12-05
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
1602 N Mechanic St
El Campo, TX 774372640
Mailing address
2100 Regional Medical Dr
Wharton, TX 774889719
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 |
|---|---|---|
| 01 (TX) | P00403974 | RAILROAD GBA - RAILROAD MEDICARE |
| 01 (TX) | P01090558 | RAILROAD MEDICARE PTAN |
| 05 (TX) | 119167803 | |
| 05 (TX) | 119167804 | |
| 01 (TX) | 887914 | BC/BS TX# |
| 01 (TX) | 8DE552 | BC/BS # |
Practice context
Part of a multi-provider practice. 8 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.
- Confirm payer enrollment if billing.NPI presence does not guarantee active enrollment with Medicare, Medicaid, or commercial payers.