Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Holly K. Michaelson, MD

Surgery Physician in Northampton, MA · enumerated 2006.

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

National Provider Identifier

1477513679

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Registry record

Entity type Individual (Type 1)

Name Holly K. Michaelson

Credential MD

Sex Female

Practice address 76 Carlon Dr, #A, Northampton, MA, 01060

Phone (413) 584-4637

Fax (413) 584-4787

Enumeration date Mar 23, 2006

Last updated in NPPES Oct 24, 2011

Taxonomy & licenses

208600000X Surgery Physician Allopathic & Osteopathic Physicians · License 221242 (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
04-3194547	Other	MA	NORTH AMERICAN PREFERRED
04-3194547	Other	MA	UNITED HEALTHCARE
04-3194547	Other	MA	GREAT-WEST
04-3194547	Other	MA	PLAN VISTA
35140	Other	MA	HNE
AA18165	Other	MA	HARVARD PILGRIM
04-3194547	Other	MA	NORTHEAST HEALTH DIRECT
04-3194547	Other	MA	PHCS
000000028880	Other	MA	BMC
04-3194547	Other	MA	UNICARE/GIC
221242	Other	MA	CONNECTICARE
3632800	Other	MA	AETNA
J27862	Other	MA	BCBSMA
04-3194547	Other	MA	CONSOLIDATED
04-3194547	Other	MA	NORTHEAST HEALTHCARE ALLI
6850767	Other	MA	CIGNA
2075725	Medicaid	MA	-
469819	Other	MA	TUFTS

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

Is NPI 1477513679 active?

Yes, as of the latest NPPES snapshot, NPI 1477513679 is active (record last updated 2011-10-24).

How do I verify Holly Michaelson's NPI record?

Cross-check NPI 1477513679 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-10-24.