Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Aaron Izenberg, MD

Neurology Physician in Boston, MA · enumerated 2012.

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

National Provider Identifier

1831448083

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Registry record

Entity type Individual (Type 1)

Name Aaron Izenberg

Credential MD

Sex Male

Practice address Massachusetts General Hospital, 55 Fruit St., Boston, MA, 02114

Phone (617) 726-5533

Enumeration date Sep 4, 2012

Last updated in NPPES Sep 4, 2012

Taxonomy & licenses

2084N0400X Neurology Physician Allopathic & Osteopathic Physicians · License L-250720 (MA) 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 Aaron Izenberg?

Aaron Izenberg 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 2012-09-04.