Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. William Arthur Castrucci, MD

Radiation Oncology Physician in Brewer, ME · enumerated 2007 · practices at Northeast Radiation Oncology PA.

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

National Provider Identifier

1396927604

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Registry record

Entity type Individual (Type 1)

Name Dr. William Arthur Castrucci

Credential MD

Sex Male

Practice address 33 Whiting Hill Rd, Brewer, ME, 04412

Phone (207) 973-7499

Fax (207) 973-7630

Enumeration date Nov 28, 2007

Last updated in NPPES Oct 4, 2023

Taxonomy & licenses

2085R0001X Radiation Oncology Physician Allopathic & Osteopathic Physicians · License 018168 (ME) 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
001336501	Other	ME	MEDICARE PTAN
434641199	Medicaid	ME	-

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 William Castrucci's NPI record?

Cross-check NPI 1396927604 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1396927604 active?

Yes, as of the latest NPPES snapshot, NPI 1396927604 is active (record last updated 2023-10-04).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-10-04.