NPI age
19 years
Enumerated 2007-05-24
● Active
Type 1 · Individual
DR. Zsuzsanna Hortobagyi McMahan, MD, MHS
McMahan is 1 of 123 internal medicine providers in Houston and 1 of 749 in Texas.
Primary specialty
Internal Medicine
Licensed in
TX
1 state
Status
Active
No deactivations on record
Last NPPES update
2023-08-14
Source: monthly bulk 2026-05
Sole proprietor
No
May be part of a larger org
How this provider compares
Across 749 active internal medicine providers in Texas.
NPI age
19 years
≈ at median (18 yr)
State licenses
1 state
15% of peers hold multiple states
Subspecialties
0
34% of peers hold subspecialties
NPI lifetime · 2007 → 2026
2007-05Enumerated in NPPES
2007
2026
Where they practice
Practice location
6410 Fannin St Ste 450
Houston, TX 770303008
Mailing address
6410 Fannin St Ste 450
Houston, TX 770303008
Specialties
-
Internal Medicine PrimaryAn internist who treats diseases of joints, muscle, bones and tendons. This specialist diagnoses and treats arthritis, back pain, muscle strains, common athletic injuries and "collagen" diseases.
Identifiers
| Type | Value | Notes |
|---|---|---|
| 01 | BP1-0026154 | INSTITUTIONAL PERMIT |
Practice context
Part of a multi-provider practice. 9 other active providers share this practice address in NPPES.
Recently enumerated nearby: 1 new internal medicine provider has 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.