Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Timothy W Sullivan, MD

Ophthalmology Physician in Portsmouth, NH · enumerated 2010.

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

National Provider Identifier

1538486717

Verified

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Registry record

Entity type Individual (Type 1)

Name Timothy W Sullivan

Credential MD

Sex Male

Practice address 155 Borthwick Ave, Suite 200 E, Portsmouth, NH, 03801

Phone (603) 436-1773

Fax (603) 427-0655

Enumeration date Apr 27, 2010

Last updated in NPPES May 11, 2020

Taxonomy & licenses

207W00000X Ophthalmology Physician Allopathic & Osteopathic Physicians · License 16565 (NH) 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
3098071	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

Where does Timothy Sullivan practice?

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

What is the NPI number for Timothy Sullivan?

The National Provider Identifier (NPI) for Timothy Sullivan is 1538486717, a Type 1 (individual) record in the CMS NPPES registry.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-05-11.