NPI age
16 years
Enumerated 2009-07-20
● Active
Type 1 · Individual
Mark Byron Jennings, MD
Jennings is 1 of 56 internal medicine providers in Allen and 1 of 12343 in Texas.
Primary specialty
Internal Medicine
Plus 1 subspecialty
Licensed in
TX
1 state
Status
Active
No deactivations on record
Last NPPES update
2012-09-12
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
16 years
≈ at median (17 yr)
State licenses
1 state
12% of peers hold multiple states
Subspecialties
1
In the 33% of peers with subspecialties
NPI lifetime · 2009 → 2026
2009-07Enumerated in NPPES
2009
2026
Where they practice
Practice location
1105 Central Expy N Ste 235
Allen, TX 750136135
Mailing address
1105 Central Expy N Ste 235
Allen, TX 750136135
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,...
-
Student in an Organized Health Care Education/Training ProgramAn individual who is enrolled in an organized health care education/training program leading to a degree, certification, registration, and/or licensure to provide health care.
Practice context
Part of a multi-provider practice. 15 other active providers share this practice address in NPPES.
Recently enumerated nearby: 3 new internal medicine providers have been added in Allen 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.