Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Beth Siwek, RD, RN, MPH
Registered Dietitian in Phoenix, AZ · enumerated 2007.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1336272087
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Registry record
Entity type Individual (Type 1)
Name Beth Siwek
Credential RD, RN, MPH
Sex Female
Practice address 1919 E Thomas Rd, Phoenix, AZ, 85016
Phone (602) 933-3366
Fax (602) 933-4264
Enumeration date Mar 13, 2007
Last updated in NPPES Jun 25, 2019
Taxonomy & licenses
133V00000X Registered Dietitian Dietary & Nutritional Service Providers · License 164.004197 (IL) Secondary
133VN1004X Pediatric Nutrition Registered Dietitian Dietary & Nutritional Service Providers Secondary
133V00000X Registered Dietitian Dietary & Nutritional Service Providers · License 881149 (AZ) Primary
RD · Registered Dietitian: A nutrition professional credentialed by the Commission on Dietetic Registration.
About the RD 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.
Frequently asked questions
Where does Beth Siwek practice?
The practice location on file with NPPES is in Phoenix, AZ. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for Beth Siwek?
The National Provider Identifier (NPI) for Beth Siwek is 1336272087, a Type 1 (individual) record in the CMS NPPES registry.
Other providers at this practice address
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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2019-06-25.