Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Aaron Grinstein, PA

Physician Assistant in Easthampton, MA · enumerated 2014.

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

National Provider Identifier

1457762106

Verified

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Registry record

Entity type Individual (Type 1)

Name Aaron Grinstein

Credential PA

Sex Male

Practice address 238 Northampton St, Easthampton, MA, 01027

Phone (413) 529-9300

Fax (866) 644-0870

Enumeration date May 15, 2014

Last updated in NPPES Mar 10, 2025

Taxonomy & licenses

363A00000X Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License AMD-875 (HI) Secondary

363AM0700X Medical Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License PA4966 (MA) Secondary

363A00000X Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License PA4966 (MA) Primary

PA · Physician Assistant: A licensed clinician who practices medicine in collaboration with physicians, trained in a graduate PA program. About the PA credential

Other identifiers

Identifier	Type	State	Issuer
PA4966	Other	MA	MA

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 Aaron Grinstein's NPI record?

Cross-check NPI 1457762106 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1457762106 active?

Yes, as of the latest NPPES snapshot, NPI 1457762106 is active (record last updated 2025-03-10).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-03-10.