Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. William Martin Oliver, MD, FRCSED

Orthopaedic Surgery Physician in Somersworth, NH · enumerated 2025.

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

National Provider Identifier

1396620621

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Registry record

Entity type Individual (Type 1)

Name Dr. William Martin Oliver

Credential MD, FRCSED

Sex Male

Practice address 7 Marsh Brook Dr, Somersworth, NH, 03878

Phone (603) 742-2007

Enumeration date Aug 6, 2025

Last updated in NPPES Aug 13, 2025

Taxonomy & licenses

207X00000X Orthopaedic Surgery Physician Allopathic & Osteopathic Physicians · License 38197 (NH) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

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

Where does William Oliver practice?

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

What is the NPI number for William Oliver?

The National Provider Identifier (NPI) for William Oliver is 1396620621, 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 2025-08-13.