Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Robert J Kosiorek, MD

Pediatrics Physician in Gilbert, AZ · enumerated 2007.

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

National Provider Identifier

1780731414

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Registry record

Entity type Individual (Type 1)

Name Robert J Kosiorek

Credential MD

Sex Male

Practice address 2451 E Baseline Rd, Ste 200, Gilbert, AZ, 85234

Phone (480) 507-2199

Fax (480) 507-0677

Enumeration date Jan 4, 2007

Last updated in NPPES Jul 9, 2015

Taxonomy & licenses

208000000X Pediatrics Physician Allopathic & Osteopathic Physicians · License 20136 (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
053504	Medicaid	AZ	-
AZ0889880	Other	AZ	BLUE CROSS BLUE SHEILD
2048349	Other	AZ	AETNA US HEALTHCARE
1Z5874	Other	AZ	HEALTHNET

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

What is the NPI number for Robert Kosiorek?

The National Provider Identifier (NPI) for Robert Kosiorek is 1780731414, a Type 1 (individual) record in the CMS NPPES registry.

Where does Robert Kosiorek practice?

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

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2015-07-09.