Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Michelle Nisenbaum, MD

Interventional Pain Medicine Physician in Waterbury, CT · enumerated 2006.

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

National Provider Identifier

1639259252

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Registry record

Entity type Individual (Type 1)

Name Michelle Nisenbaum

Credential MD

Sex Female

Practice address 1320 West Main St, Bldg 2, Waterbury, CT, 06708

Phone (203) 755-9355

Fax (203) 597-8192

Enumeration date Oct 17, 2006

Last updated in NPPES Sep 12, 2012

Taxonomy & licenses

2081P2900X Pain Medicine (Physical Medicine & Rehabilitation) Physician Allopathic & Osteopathic Physicians · License 043409 (CT) Secondary

208VP0014X Interventional Pain Medicine Physician Allopathic & Osteopathic Physicians · License 043409 (CT) 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
3821999	Other	-	AETNA US HEALTH CARE
P00296425	Other	-	RAILROAD MEDICARE
2771432	Other	-	CIGNA
2V7481	Other	-	HEALTH NET
2525598	Other	-	UNITED HEALTH CARE
001434092	Medicaid	CT	-
010043409CT01	Other	CT	ANTHEM BCBS OF CT
P3673144	Other	-	OXFORD
043409	Other	-	CONNECTICARE

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

What is the NPI number for Michelle Nisenbaum?

The National Provider Identifier (NPI) for Michelle Nisenbaum is 1639259252, a Type 1 (individual) record in the CMS NPPES registry.

Where does Michelle Nisenbaum practice?

The practice location on file with NPPES is in Waterbury, CT. Providers can have multiple locations; NPPES lists the primary practice address.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2012-09-12.