Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Katelyn Isherwood

Family Medicine Physician in Derry, NH · enumerated 2022 · practices at Derry Neurological Associates, PC.

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

National Provider Identifier

1639890502

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Registry record

Entity type Individual (Type 1)

Name Katelyn Isherwood

Sex Female

Practice address 44 Birch St Ste 305, Derry, NH, 03038

Phone (603) 845-1966

Enumeration date Sep 8, 2022

Last updated in NPPES Jul 10, 2024

Taxonomy & licenses

207Q00000X Family Medicine Physician Allopathic & Osteopathic Physicians · License 265702 (MA) Primary

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

How do I verify Katelyn Isherwood's NPI record?

Cross-check NPI 1639890502 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1639890502 active?

Yes, as of the latest NPPES snapshot, NPI 1639890502 is active (record last updated 2024-07-10).

Other providers at this practice address

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Derry Neurological Associates, PC Neurology Physician · Derry, NH NPI 1790880516

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-07-10.