Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

F. Linda Oro-Castillo M.D., P.A.

Hematology & Oncology Physician in Denison, TX · enumerated 2010 · authorized official F Oro-Castillo, Owner/Physician.

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

National Provider Identifier

1952619454

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Registry record

Entity type Organization (Type 2)

Legal business name F. Linda Oro-Castillo M.D., P.A.

Practice address 1105 Memorial Drive, Suite 110, Denison, TX, 75020

Phone (903) 463-1621

Fax (903) 463-5183

Enumeration date Sep 17, 2010

Last updated in NPPES Nov 15, 2011

Taxonomy & classification

207RH0003X Hematology & Oncology Physician Allopathic & Osteopathic Physicians · License G4185 (TX) Primary

Authorized official

Name F Oro-Castillo

Title Owner/Physician

Phone (903) 463-1621

Other identifiers

Identifier	Type	State	Issuer
00TC98	Other	TX	MEDICARE PTAN
0361537-01	Medicaid	TX	-

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.

Read the full guide → Validate an NPI →

Frequently asked questions

What is a Type 2 NPI?

A Type 2 NPI identifies an organization (group practice, hospital, pharmacy, lab), while Type 1 NPIs identify individual providers. Organizations bill under their Type 2 NPI.

What type of organization is F. Linda Oro-Castillo M.D., P.A.?

F. Linda Oro-Castillo M.D., P.A. is registered in NPPES as a Hematology & Oncology Physician (its primary provider taxonomy).

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-11-15.