William Parker PHD PC
NPI 1821339250 · Clinical Psychologist · Grand Rapids, MI
Enrolled with Medicare as Part B Supplier - Clinic/Group Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Parker PHD PC is a Clinical Psychologist organization in Grand Rapids, MI (NPI 1821339250).
Provider details
- NPI number
- 1821339250
- Entity type
- Organization
- Primary specialty
- Clinical PsychologistBehavioral Health & Social Service Providers
- Organization subpart
- No
- Authorized official
- William Parker, Owner(616) 285-6080
- License
- 6301007243 (MI)
Specialties & taxonomies
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
13 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
- 2013-03-11
- Last updated
- 2013-03-11
Frequently asked questions
- What is William Parker PHD PC's NPI number?
- William Parker PHD PC's National Provider Identifier (NPI) is 1821339250, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What type of organization is William Parker PHD PC?
- William Parker PHD PC is classified in the NPPES registry as Clinical Psychologist (Behavioral Health & Social Service Providers).
- Where is William Parker PHD PC located?
- William Parker PHD PC's practice location on file with NPPES is 2894 Thornapple River Dr Se, Grand Rapids, MI 49546-6857.
- What is William Parker PHD PC's phone number?
- The practice phone number listed in the NPPES registry for William Parker PHD PC is (616) 285-6080.
- Does William Parker PHD PC accept Medicare?
- William Parker PHD PC is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Who is the authorized official for William Parker PHD PC?
- The authorized official listed on William Parker PHD PC's NPPES record is William Parker, Owner. The authorized official registers and maintains the organization's NPI and is not necessarily its owner.
- Is William Parker PHD PC's NPI active?
- Yes — William Parker PHD PC's NPI (1821339250) is active in the NPPES registry as of the last update on 2013-03-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.