Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

John L Mandeville, FNP-BC

Family Nurse Practitioner in Amherst, NH · enumerated 2022 · practices at Granite State Men S Health LLC.

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

National Provider Identifier

1538871496

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Registry record

Entity type Individual (Type 1)

Name John L Mandeville

Credential FNP-BC

Sex Male

Practice address 282 State Route 101 Unit 2, Amherst, NH, 03031

Phone (603) 693-2100

Fax (603) 679-1046

Enumeration date Dec 21, 2022

Last updated in NPPES Jun 10, 2024

Taxonomy & licenses

363LF0000X Family Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 079027-23 (NH) 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.

Read the full guide → Validate an NPI →

Frequently asked questions

How do I verify John Mandeville's NPI record?

Cross-check NPI 1538871496 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1538871496 active?

Yes, as of the latest NPPES snapshot, NPI 1538871496 is active (record last updated 2024-06-10).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-06-10.