Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Sara Hammer Riordan, M.S.

Q: What is the NPI number for Sara Riordan?

The National Provider Identifier (NPI) for Sara Riordan is 1639168354, a Type 1 (individual) record in the CMS NPPES registry.

Genetic Counselor (M.S.) in Tucson, AZ · enumerated 2005.

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

National Provider Identifier

1639168354

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Registry record

Entity type Individual (Type 1)

Name Sara Hammer Riordan

Credential M.S.

Sex Female

Practice address 1501 N Campbell Ave, Room 1156, Tucson, AZ, 85724

Phone (520) 626-3410

Fax (520) 626-2720

Enumeration date Oct 14, 2005

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

170300000X Genetic Counselor (M.S.) Other Service Providers Primary

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 Sara Riordan?

The National Provider Identifier (NPI) for Sara Riordan is 1639168354, a Type 1 (individual) record in the CMS NPPES registry.

Where does Sara Riordan practice?

The practice location on file with NPPES is in Tucson, 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 2007-07-08.