Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Alan J. Gelenberg, MD

Psychiatry Physician in Tucson, AZ · enumerated 2006.

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

National Provider Identifier

1891768602

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Registry record

Entity type Individual (Type 1)

Name Dr. Alan J. Gelenberg

Credential MD

Sex Male

Practice address 1501 N Campbell Ave, Tucson, AZ, 85724

Phone (520) 874-3500

Enumeration date Feb 10, 2006

Last updated in NPPES Nov 25, 2009

Taxonomy & licenses

2084P0800X Psychiatry Physician Allopathic & Osteopathic Physicians · License 19270 (AZ) Secondary

2084P0800X Psychiatry Physician Allopathic & Osteopathic Physicians · License 51294-020 (WI) 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.

Read the full guide → Validate an NPI →

Frequently asked questions

What specialty is Alan Gelenberg?

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

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.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2009-11-25.