Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Seth Eisen, M.D.

Internal Medicine Physician in Massapequa, NY · enumerated 2006.

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

National Provider Identifier

1841351947

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Registry record

Entity type Individual (Type 1)

Name Dr. Seth Eisen

Credential M.D.

Sex Male

Practice address 510 Hicksville Rd, Massapequa, NY, 11758

Phone (516) 795-2626

Fax (516) 799-7451

Enumeration date Dec 12, 2006

Last updated in NPPES Aug 26, 2013

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 143891 (NY) 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
201285536	Other	-	MAGNACARE
201285536	Other	-	UHC
2590537	Other	-	GHI
34051	Other	-	VYTRA
P00187616	Other	-	RR MCR
201285536	Other	-	PHCS
2C7636	Other	-	PHS
12774P	Other	-	HIP
259AC1	Other	-	BLUE CROSS BLUE SHIELD
AA45492A	Other	-	MDNY
00797782	Medicaid	NY	-
201285536	Other	-	EMPIRE
3C7538	Other	-	HEALTHNET
5342932	Other	-	CIGNA
201285536	Other	-	HORIZON
P471137	Other	-	OXFORD

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 Seth Eisen?

Seth Eisen is registered in NPPES with the primary taxonomy of Internal Medicine Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2013-08-26.