Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Marcia C Diederich

School Psychologist in Phoenix, AZ · enumerated 2008.

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

National Provider Identifier

1003067919

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Registry record

Entity type Individual (Type 1)

Name Marcia C Diederich

Sex Female

Practice address 25250 N 35th Ave, Phoenix, AZ, 85083

Phone (623) 445-7100

Fax (623) 445-7180

Enumeration date Oct 9, 2008

Last updated in NPPES Oct 9, 2008

Taxonomy & licenses

103TS0200X School Psychologist Behavioral Health & Social Service Providers · License 4074924 (AZ) 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.

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Frequently asked questions

Is NPI 1003067919 active?

Yes, as of the latest NPPES snapshot, NPI 1003067919 is active (record last updated 2008-10-09).

How do I verify Marcia Diederich's NPI record?

Cross-check NPI 1003067919 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-10-09.