Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mr. Herbert Eldon Gregg, MD

Neurology Physician in Lenox, MA · enumerated 2008.

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

National Provider Identifier

1558525766

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Registry record

Entity type Individual (Type 1)

Name Mr. Herbert Eldon Gregg

Credential MD

Sex Male

Practice address 91 West Street, Lenox, MA, 01240

Phone (800) 348-4565

Fax (413) 496-6842

Enumeration date Jul 16, 2008

Last updated in NPPES Dec 20, 2018

Taxonomy & licenses

2084N0400X Neurology Physician Allopathic & Osteopathic Physicians · License 237083 (MA) Primary

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

Other identifiers

Identifier	Type	State	Issuer
ME117447	Other	FL	FL STATE LICENSE

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 Herbert Gregg's NPI record?

Cross-check NPI 1558525766 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1558525766 active?

Yes, as of the latest NPPES snapshot, NPI 1558525766 is active (record last updated 2018-12-20).

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2018-12-20.