NPI age
19 years
Enumerated 2006-06-19
● Active
Type 1 · Individual
DR. John J McCarthy, M.D.
McCarthy is 1 of 248 internal medicine providers in Houston and 1 of 1069 in Texas.
Primary specialty
Internal Medicine
Licensed in
TX
1 state
Status
Active
No deactivations on record
Last NPPES update
2013-02-19
Source: monthly bulk 2026-05
Sole proprietor
No
May be part of a larger org
How this provider compares
Across 1069 active internal medicine providers in Texas.
NPI age
19 years
≈ at median (18 yr)
State licenses
1 state
22% of peers hold multiple states
Subspecialties
0
52% of peers hold subspecialties
NPI lifetime · 2006 → 2026
2006-06Enumerated in NPPES
2006
2026
Where they practice
Practice location
6550 Fannin St, Suite 1101
Houston, TX 770302717
Mailing address
6550 Fannin St, Suite 1101
Houston, TX 770302717
Specialties
-
Internal Medicine PrimaryAn internist doctor of osteopathy that specializes in the treatment of the combination of hematology and oncology disorders. A doctor of osteopathy that is board eligible/certified by the American Osteopathic Board of Internal Medicine...
Identifiers
| Type | Value | Notes |
|---|---|---|
| 01 (TX) | 8W8518 | BCBS |
| 05 (LA) | 2122291 | |
| 01 (TX) | P01120357 | RR MEDICARE |
| 05 (TX) | 134241208 | |
| 05 (TX) | 134241209 |
Practice context
Part of a multi-provider practice. 376 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.