Gretchen Diem, PHD
NPI 1972521946 · Psychologist · Madison, WI
Enrolled with Medicare as Practitioner - Clinical Psychologist · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gretchen Diem, PHD is a Psychologist provider in Madison, WI (NPI 1972521946).
Provider details
- NPI number
- 1972521946
- Entity type
- Individual
- Primary specialty
- PsychologistBehavioral Health & Social Service Providers
- Credential
- PHD
- Sex
- Female
- Sole proprietor
- No
- License
- PSY19404 (CA)
Specialties & taxonomies
Behavioral Health & Social Service Providers
Behavioral Health & Social Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
20 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-07-18
- Last updated
- 2021-04-08
- Certified
- 2021-04-08
Frequently asked questions
- What is Gretchen Diem's NPI number?
- Gretchen Diem's National Provider Identifier (NPI) is 1972521946, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gretchen Diem's specialty?
- Gretchen Diem is listed in the NPPES registry with a primary specialty of Psychologist (Behavioral Health & Social Service Providers).
- Where is Gretchen Diem located?
- Gretchen Diem's practice location on file with NPPES is 700 Rayovac Drive, Madison, WI 53711-2476.
- What is Gretchen Diem's phone number?
- The practice phone number listed in the NPPES registry for Gretchen Diem is (608) 492-0053.
- Does Gretchen Diem accept Medicare?
- Gretchen Diem is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gretchen Diem's NPI active?
- Yes — Gretchen Diem's NPI (1972521946) is active in the NPPES registry as of the last update on 2021-04-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.