Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mr. William Guy Mahan, PA-C

Medical Physician Assistant in Bar Harbor, ME · enumerated 2006.

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

National Provider Identifier

1962514356

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Registry record

Entity type Individual (Type 1)

Name Mr. William Guy Mahan

Credential PA-C

Sex Male

Practice address 10 Wayman Ln, Bar Harbor, ME, 04609

Phone (207) 288-5081

Fax (207) 288-8642

Enumeration date Aug 31, 2006

Last updated in NPPES Mar 6, 2013

Taxonomy & licenses

363AM0700X Medical Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License PA385 (ME) Primary

Other identifiers

Identifier	Type	State	Issuer
1023800100	Medicaid	ME	-
AP0611	Other	ME	MEDICARE B - MDIH

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

What specialty is William Mahan?

William Mahan is registered in NPPES with the primary taxonomy of Medical Physician Assistant. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

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Robert Weiss Internal Medicine Physician · Bar Harbor, ME NPI 1538150503 Jorge Peacher Urogynecology and Reconstructive Pelvic Surgery (Obstetrics & Gynecology) Physician · Bar Harbor, ME NPI 1629052253 Maureen Magut Charette Diagnostic Radiology Physician · Bar Harbor, ME NPI 1205812476 John Benson Diagnostic Radiology Physician · Bar Harbor, ME NPI 1154308948 David Mcquade Diagnostic Radiology Physician · Bar Harbor, ME NPI 1497732283 Hancock County Radiology Consultants PA Diagnostic Radiology Physician · Bar Harbor, ME NPI 1831176627 Mount Desert Island Hospital Critical Access Hospital · Bar Harbor, ME NPI 1790764512 Mark Brown Internal Medicine Physician · Bar Harbor, ME NPI 1982683496

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2013-03-06.