William Petersen, PH.D.
NPI 1124109400 · Counseling Psychologist · Saint Louis, MO
William Petersen, PH.D. is a Counseling Psychologist provider in Saint Louis, MO (NPI 1124109400).
Provider details
- NPI number
- 1124109400
- Entity type
- Individual
- Primary specialty
- Counseling PsychologistBehavioral Health & Social Service Providers
- Credential
- PH.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 01531 (MO)
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
19 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
- 2006-10-17
- Last updated
- 2008-06-12
Frequently asked questions
- What is William Petersen's NPI number?
- William Petersen's National Provider Identifier (NPI) is 1124109400, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Petersen's specialty?
- William Petersen is listed in the NPPES registry with a primary specialty of Counseling Psychologist (Behavioral Health & Social Service Providers).
- Where is William Petersen located?
- William Petersen's practice location on file with NPPES is 5351 Delmar Blvd, Saint Louis, MO 63112-3146.
- What is William Petersen's phone number?
- The practice phone number listed in the NPPES registry for William Petersen is (314) 877-0685.
- Is William Petersen's NPI active?
- Yes — William Petersen's NPI (1124109400) is active in the NPPES registry as of the last update on 2008-06-12.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.