Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Alan Aaron Stein, MD

Neurological Surgery Physician in Valhalla, NY · enumerated 2018.

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

National Provider Identifier

1164911491

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Registry record

Entity type Individual (Type 1)

Name Dr. Alan Aaron Stein

Credential MD

Sex Male

Practice address 100 Woods Rd Ste 13251333, Valhalla, NY, 10595

Phone (561) 809-6264

Enumeration date May 2, 2018

Last updated in NPPES Sep 26, 2022

Taxonomy & licenses

207T00000X Neurological Surgery Physician Allopathic & Osteopathic Physicians · License 25MA11309800 (NJ) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

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 Alan Stein?

Alan Stein is registered in NPPES with the primary taxonomy of Neurological Surgery Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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Iman Moeini Naghani Neurological Surgery Physician · Valhalla, NY NPI 1487181020

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-09-26.