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William Pierce, PHD
NPI 1205801727 · Clinical Psychologist · Yankton, SD
William Pierce, PHD is a Clinical Psychologist provider in Yankton, SD (NPI 1205801727).
Provider details
- NPI number
- 1205801727
- Entity type
- Individual
- Primary specialty
- Clinical PsychologistBehavioral Health & Social Service Providers
- Credential
- PHD
- Sex
- Male
- Sole proprietor
- No
- License
- 431 (SD)
Specialties & taxonomies
Behavioral Health & Social Service Providers
Profile Score
Detailed profile(91/100 index)
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
1000 W 4th St
Yankton, SD 57078-3730
Phone: (605) 665-0258
Street-level locationGet directions
Mailing address
1000 W 4th St
Yankton, SD 57078-3700
Registry dates
- Enumerated
- 2006-02-19
- Last updated
- 2011-05-23
Frequently asked questions
- What is William Pierce's NPI number?
- William Pierce's National Provider Identifier (NPI) is 1205801727, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Pierce's specialty?
- William Pierce is listed in the NPPES registry with a primary specialty of Clinical Psychologist (Behavioral Health & Social Service Providers).
- Where is William Pierce located?
- William Pierce's practice location on file with NPPES is 1000 W 4th St, Yankton, SD 57078-3730.
- What is William Pierce's phone number?
- The practice phone number listed in the NPPES registry for William Pierce is (605) 665-0258.
- Is William Pierce's NPI active?
- Yes — William Pierce's NPI (1205801727) is active in the NPPES registry as of the last update on 2011-05-23.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.