Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Joseph A. Gassen, M.D.

Pediatrics Physician in Mesa, AZ · enumerated 2005.

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

National Provider Identifier

1972586006

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Registry record

Entity type Individual (Type 1)

Name Dr. Joseph A. Gassen

Credential M.D.

Sex Male

Practice address 5131 E Southern Ave, Mesa, AZ, 85206

Phone (480) 833-5437

Fax (480) 833-9349

Enumeration date Nov 22, 2005

Last updated in NPPES Aug 1, 2013

Taxonomy & licenses

208000000X Pediatrics Physician Allopathic & Osteopathic Physicians · License 18975 (MS) Secondary

208M00000X Hospitalist Physician Allopathic & Osteopathic Physicians · License 18975 (MS) Secondary

208000000X Pediatrics Physician Allopathic & Osteopathic Physicians · License 47682 (AZ) 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
009932953	Medicaid	AL	-
04150085	Medicaid	MS	-

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 is the NPI number for Joseph Gassen?

The National Provider Identifier (NPI) for Joseph Gassen is 1972586006, a Type 1 (individual) record in the CMS NPPES registry.

Where does Joseph Gassen practice?

The practice location on file with NPPES is in Mesa, AZ. Providers can have multiple locations; NPPES lists the primary practice address.

Other providers at this practice address

Browse all →

Karl Baumgartner Pediatrics Physician · Mesa, AZ NPI 1174522890 James Williams Pediatric Hematology & Oncology Physician · Mesa, AZ NPI 1316930837 Sanjay Shah Pediatric Hematology & Oncology Physician · Mesa, AZ NPI 1740263474 Adrianna Salazar Speech-Language Pathologist · Mesa, AZ NPI 1043363831 Ginger Carlson Clinical Psychologist · Mesa, AZ NPI 1881722692 Phoenix Children'S Medical Group Multi-Specialty Clinic/Center · Mesa, AZ NPI 1487814240 Phoenix Children'S Hospital, Inc. Children's Hospital · Mesa, AZ NPI 1275886434 Phoenix Children'S Hospital, Inc. Urgent Care Clinic/Center · Mesa, AZ NPI 1215271911

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2013-08-01.