Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Gretchen A Diem, PHD
Psychologist in Madison, WI · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1972521946
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Registry record
Entity type Individual (Type 1)
Name Gretchen A Diem
Credential PHD
Sex Female
Practice address 700 Rayovac Drive, Suite 311, Madison, WI, 53711
Phone (608) 492-0053
Enumeration date Jul 18, 2006
Last updated in NPPES Apr 8, 2021
Taxonomy & licenses
103T00000X Psychologist Behavioral Health & Social Service Providers · License PSY19404 (CA) Secondary
PHD · Doctor of Philosophy: A doctoral degree; in healthcare often held by clinical psychologists and researchers.
About the PHD credential
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 2591-57 | Other | WI | PSYCH |
| PSY19404 | Other | CA | PSYCH |
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
How do I verify Gretchen Diem's NPI record?
Cross-check NPI 1972521946 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Is NPI 1972521946 active?
Yes, as of the latest NPPES snapshot, NPI 1972521946 is active (record last updated 2021-04-08).
Other providers at this practice address
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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-04-08.