NPI age
13 years
Enumerated 2013-05-16
● Active
Type 1 · Individual
Bryon Callahan, M.D.
Callahan is 1 of 915 emergency medicine providers in Houston and 1 of 6039 in Texas.
Primary specialty
Emergency Medicine
Plus 1 subspecialty
Licensed in
TX, NC
2 states
Status
Active
No deactivations on record
Last NPPES update
2024-09-13
Source: monthly bulk 2026-05
Sole proprietor
Yes
Solo practice on file
How this provider compares
Across 6039 active emergency medicine providers in Texas.
NPI age
13 years
↓ 2 yr below median (15 yr)
State licenses
2 states
Top 82% — 17% of peers are multi-state
Subspecialties
0
43% of peers hold subspecialties
NPI lifetime · 2013 → 2026
2013-05Enumerated in NPPES
2013
2026
Where they practice
Practice location
1635 North Loop W
Houston, TX 77008
Mailing address
1635 North Loop W
Houston, TX 770081532
Additional practice locations
1 secondary location on file with NPPES.
Location 2
1000 Blythe Blvd, Meb 3
Charlotte, NC 282035812
Specialties
-
Emergency Medicine PrimaryAn emergency physician focuses on the immediate decision making and action necessary to prevent death or any further disability both in the pre-hospital setting by directing emergency medical technicians and in the emergency department....
Practice context
Part of a multi-provider practice. 118 other active providers share this practice address in NPPES.
Recently enumerated nearby: 5 new emergency medicine providers have been added in Houston 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.