Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Allen Lawrence Fein, M.D.

Family Medicine Physician in Southampton, NY · enumerated 2006.

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

National Provider Identifier

1881672533

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Registry record

Entity type Individual (Type 1)

Name Allen Lawrence Fein

Credential M.D.

Sex Male

Practice address Southampton, NY, 11968

Phone (631) 283-6446

Enumeration date Jan 4, 2006

Last updated in NPPES Jun 20, 2018

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

207Q00000X Family Medicine Physician Allopathic & Osteopathic Physicians · License A2000404 (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
01593668	Medicaid	NY	-
P2130294	Other	-	OXFORD HEALTHPLANS
AK46204A	Other	NY	MDNY
P374141	Other	-	OXFORD
38484	Other	-	CIGNA
54733	Other	-	VYTRA HEALTH PLANS
711379	Other	-	HARVARD PILGRIM HEALTHCAR
88573	Other	-	VYTRA HEALTH PLANS

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 Allen Fein?

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

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2018-06-20.