Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Brett C Hynninen, M.D.

Physical Medicine & Rehabilitation Physician in Northampton, MA · enumerated 2006.

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

National Provider Identifier

1629010947

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Registry record

Entity type Individual (Type 1)

Name Dr. Brett C Hynninen

Credential M.D.

Sex Male

Practice address 766 N King St Ste 2, Northampton, MA, 01060

Phone (413) 586-0230

Fax (413) 586-1068

Enumeration date Jun 12, 2006

Last updated in NPPES Jun 25, 2025

Taxonomy & licenses

208100000X Physical Medicine & Rehabilitation Physician Allopathic & Osteopathic Physicians · License 161095 (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
25255	Other	MA	HNE
406529	Other	MA	TUFTS
80558	Other	MA	HARVARD PILGRIM
J21646	Other	MA	BCBS
0001519	Other	VT	MEDICARE
3199975	Medicaid	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

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

What specialty is Brett Hynninen?

Brett Hynninen is registered in NPPES with the primary taxonomy of Physical Medicine & Rehabilitation Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Other providers at this practice address

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Derek Davidson Physical Medicine & Rehabilitation Physician · Northampton, MA NPI 1326238718

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-06-25.