Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

John F Cassidy IV, PA-C

Physician Assistant in Eastport, ME · enumerated 2006.

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

National Provider Identifier

1891890166

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Registry record

Entity type Individual (Type 1)

Name John F Cassidy IV

Credential PA-C

Sex Male

Practice address 30 Boynton St, Eastport, ME, 04631

Phone (207) 853-6001

Enumeration date Sep 13, 2006

Last updated in NPPES Feb 4, 2026

Taxonomy & licenses

363A00000X Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License PA389 (ME) Primary

Other identifiers

Identifier	Type	State	Issuer
259290099	Medicaid	ME	-
MM9086	Other	ME	MEDICARE GROUP NUMBER

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

How do I verify John Cassidy's NPI record?

Cross-check NPI 1891890166 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1891890166 active?

Yes, as of the latest NPPES snapshot, NPI 1891890166 is active (record last updated 2026-02-04).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-02-04.