Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Kathryn Addy Thomas

Family Medicine Physician in Portsmouth, NH · enumerated 2021.

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

National Provider Identifier

1598344954

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Registry record

Entity type Individual (Type 1)

Name Kathryn Addy Thomas

Sex Female

Practice address 8 Greenleaf Woods Dr, Portsmouth, NH, 03801

Phone (603) 422-8208

Enumeration date Apr 5, 2021

Last updated in NPPES Nov 12, 2025

Taxonomy & licenses

207Q00000X Family Medicine Physician Allopathic & Osteopathic Physicians · License 34229 (NH) Primary

207Q00000X Family Medicine Physician Allopathic & Osteopathic Physicians · License 78066 (CT) Secondary

207Q00000X Family Medicine Physician Allopathic & Osteopathic Physicians · License 334906 (NY) Secondary

207Q00000X Family Medicine Physician Allopathic & Osteopathic Physicians · License 1020156 (MA) Secondary

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 Kathryn Thomas?

The National Provider Identifier (NPI) for Kathryn Thomas is 1598344954, a Type 1 (individual) record in the CMS NPPES registry.

Where does Kathryn Thomas practice?

The practice location on file with NPPES is in Portsmouth, 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 2025-11-12.