NPI age
19 years
Enumerated 2006-07-19
● Active
Type 1 · Individual
Michael E Zwillman, MD
Zwillman is 1 of 141 internal medicine providers in Houston and 1 of 479 in Texas.
Primary specialty
Internal Medicine
Licensed in
TX
1 state
Status
Active
No deactivations on record
Last NPPES update
2014-11-05
Source: monthly bulk 2026-05
Sole proprietor
No
May be part of a larger org
How this provider compares
Across 479 active internal medicine providers in Texas.
NPI age
19 years
↑ 3 yr above median (16 yr)
State licenses
1 state
32% of peers hold multiple states
Subspecialties
0
79% of peers hold subspecialties
NPI lifetime · 2006 → 2026
2006-07Enumerated in NPPES
2006
2026
Where they practice
Practice location
6565 Fannin St, B452
Houston, TX 770302703
Mailing address
6565 Fannin St, B452
Houston, TX 770302703
Specialties
-
Internal Medicine PrimaryAn internist who diagnoses, treats and supports patients with multiple organ dysfunction. This specialist may have administrative responsibilities for intensive care units and may also facilitate and coordinate patient care among the...
Identifiers
| Type | Value | Notes |
|---|---|---|
| 01 (TX) | P00371854 | RAILROAD MEDICARE |
| 01 (TX) | P01311970 | RR MEDICARE |
| 05 (TX) | 184277502 | |
| 01 (TX) | 8W4772 | BLUE CROSS BLUE SHIELD |
| 05 (TX) | 184277503 | |
| 01 (TX) | P01031020 | RR MEDICARE |
| 05 (TX) | 184277501 |
Practice context
Part of a multi-provider practice. 591 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.
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