NPI age
9 years
Enumerated 2017-04-19
● Active
Type 1 · Individual
Carl Alexander Zehner, M.D
Zehner is 1 of 422 internal medicine providers in Houston and 1 of 2301 in Texas.
Primary specialty
Internal Medicine
Plus 1 subspecialty
Licensed in
TX
1 state
Status
Active
No deactivations on record
Last NPPES update
2023-10-02
Source: monthly bulk 2026-05
Sole proprietor
No
May be part of a larger org
How this provider compares
Across 2301 active internal medicine providers in Texas.
NPI age
9 years
↓ 10 yr below median (19 yr)
State licenses
1 state
11% of peers hold multiple states
Subspecialties
1
In the 37% of peers with subspecialties
NPI lifetime · 2017 → 2026
2017-04Enumerated in NPPES
2017
2026
Where they practice
Practice location
1515 Holcombe Blvd
Houston, TX 770304000
Mailing address
Po Box 4439
Houston, TX 772104439
Additional practice locations
2 secondary locations on file with NPPES.
Location 2
6431 Fannin St Ste 600
Houston, TX 770301501
Location 3
One Baylor Plaza, Baylor College Of Medicine
Houston, TX 770303498
Specialties
-
Internal Medicine PrimaryAn internist who specializes in diseases of the heart and blood vessels and manages complex cardiac conditions such as heart attacks and life-threatening, abnormal heartbeat rhythms.
-
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. 3675 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.