Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. William Kevin Sullivan, DMD

Dentist in Manchester, NH · enumerated 2005.

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

National Provider Identifier

1659375384

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Registry record

Entity type Individual (Type 1)

Name Dr. William Kevin Sullivan

Credential DMD

Sex Male

Practice address 100 Mcgregor St, E-542, Manchester, NH, 03102

Phone (603) 663-6226

Fax (603) 663-7800

Enumeration date Jun 10, 2005

Last updated in NPPES Aug 17, 2007

Taxonomy & licenses

122300000X Dentist Dental Providers · License 3221 (NH) Primary

DMD · Doctor of Medicine in Dentistry: A licensed dentist; DMD and DDS are equivalent dental degrees. About the DMD credential

Other identifiers

Identifier	Type	State	Issuer
30301692	Medicaid	NH	-

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 the NPI number for William Sullivan?

The National Provider Identifier (NPI) for William Sullivan is 1659375384, a Type 1 (individual) record in the CMS NPPES registry.

Where does William Sullivan practice?

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

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-08-17.