NPI age
20 years
Enumerated 2006-04-26
● Active
Type 1 · Individual
DR. Rene Alberto Castillo, MD
Castillo is 1 of 27 internal medicine providers in Austin and 1 of 576 in Texas.
Primary specialty
Internal Medicine
Plus 2 subspecialties
Licensed in
TX, LA
2 states
Status
Active
No deactivations on record
Last NPPES update
2023-02-10
Source: monthly bulk 2026-05
Sole proprietor
No
May be part of a larger org
How this provider compares
Across 576 active internal medicine providers in Texas.
NPI age
20 years
≈ at median (19 yr)
State licenses
2 states
Top 81% — 18% of peers are multi-state
Subspecialties
1
In the 46% of peers with subspecialties
NPI lifetime · 2006 → 2026
2006-04Enumerated in NPPES
2006
2026
Where they practice
Practice location
4101 James Casey St Ste 100
Austin, TX 787451145
Mailing address
Po Box 911230
Dallas, TX 753911230
Specialties
-
Internal Medicine PrimaryAn internist who specializes in the diagnosis and treatment of all types of cancer and other benign and malignant tumors. This specialist decides on and administers therapy for these malignancies as well as consults with surgeons and...
-
Internal MedicineAn 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) | P00662892 | RAILROAD MEDICARE |
| 01 (TX) | 8BP223 | BCBS OF TX |
| 05 (TX) | 182873303 | |
| 05 (TX) | 182873302 | |
| 01 (TX) | P00662592 | RAILROAD MEDICARE |
Multi-state credentialing: Licensed in 2 states. Useful context for credentialers building cross-state provider networks.
Practice context
Part of a multi-provider practice. 14 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 →
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