Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Annie L Castillo, MD

Hematology & Oncology Physician in Bozeman, MT · enumerated 2006.

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

National Provider Identifier

1902820483

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Registry record

Entity type Individual (Type 1)

Name Dr. Annie L Castillo

Credential MD

Sex Female

Practice address 915 Highland Blvd # 3220, Bozeman, MT, 59715

Phone (406) 556-5535

Enumeration date Jul 27, 2006

Last updated in NPPES Oct 11, 2007

Taxonomy & licenses

207RH0003X Hematology & Oncology Physician Allopathic & Osteopathic Physicians · License 6439 (MT) 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
110222892	Other	-	MEDICARE RAILROAD
97620	Other	-	BLUE CROSS
0141011	Medicaid	MT	-

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

Where does Annie Castillo practice?

The practice location on file with NPPES is in Bozeman, MT. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for Annie Castillo?

The National Provider Identifier (NPI) for Annie Castillo is 1902820483, a Type 1 (individual) record in the CMS NPPES registry.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-10-11.