Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Rene Alberto Castillo, MD

Medical Oncology Physician in Austin, TX · enumerated 2006 · practices at Texas Oncology PA.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1134186166

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Registry record

Entity type Individual (Type 1)

Name Dr. Rene Alberto Castillo

Credential MD

Sex Male

Practice address 4101 James Casey St Ste 100, Austin, TX, 78745

Phone (512) 447-2202

Fax (512) 447-5337

Enumeration date Apr 26, 2006

Last updated in NPPES Feb 10, 2023

Taxonomy & licenses

207RH0003X Hematology & Oncology Physician Allopathic & Osteopathic Physicians · License MD.12610R (LA) Secondary

207RH0003X Hematology & Oncology Physician Allopathic & Osteopathic Physicians · License M3964 (TX) Secondary

207RX0202X Medical Oncology Physician Allopathic & Osteopathic Physicians · License M3964 (TX) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier	Type	State	Issuer
P00662892	Other	TX	RAILROAD MEDICARE
8BP223	Other	TX	BCBS OF TX
182873303	Medicaid	TX	-
182873302	Medicaid	TX	-
P00662592	Other	TX	RAILROAD MEDICARE

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

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Frequently asked questions

How do I verify Rene Castillo's NPI record?

Cross-check NPI 1134186166 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1134186166 active?

Yes, as of the latest NPPES snapshot, NPI 1134186166 is active (record last updated 2023-02-10).

Other providers at this practice address

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Laurence Tokaz Medical Oncology Physician · Austin, TX NPI 1124060256 James Uyeki Medical Oncology Physician · Austin, TX NPI 1124187927 Diaa Osman Hematology & Oncology Physician · Austin, TX NPI 1689894495 Aimee Mackey Surgical Oncology Physician · Austin, TX NPI 1386834836 Texas Oncology PA Medical Oncology Physician · Austin, TX NPI 1972770303 Jennifer Wright Hematology & Oncology Physician · Austin, TX NPI 1568624831 Shaun Mckenzie Surgical Oncology Physician · Austin, TX NPI 1114189933 Kathryn Thompson Physician Assistant · Austin, TX NPI 1003182130

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-02-10.