Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Neil Allen, M.D.

Neurology Physician in Northbrook, IL · enumerated 2005.

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

National Provider Identifier

1255325023

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Registry record

Entity type Individual (Type 1)

Name Dr. Neil Allen

Credential M.D.

Sex Male

Practice address 1535 Lake Cook Rd, Suite 601, Northbrook, IL, 60062

Phone (847) 509-0270

Fax (847) 509-0273

Enumeration date Sep 7, 2005

Last updated in NPPES Feb 14, 2014

Taxonomy & licenses

2084N0400X Neurology Physician Allopathic & Osteopathic Physicians · License 036040773 (IL) 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
036040773	Medicaid	IL	-

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 Neil Allen?

Neil Allen is registered in NPPES with the primary taxonomy of Neurology 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 2014-02-14.