Gillian Mayersohn, PSY.D., ABPP
NPI 1265917884 · Clinical Psychologist · Saint Louis, MO
Enrolled with Medicare as Practitioner - Clinical Psychologist · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gillian Mayersohn, PSY.D., ABPP is a Clinical Psychologist provider in Saint Louis, MO (NPI 1265917884).
Provider details
- NPI number
- 1265917884
- Entity type
- Individual
- Primary specialty
- Clinical PsychologistBehavioral Health & Social Service Providers
- Credential
- PSY.D., ABPP
- Sex
- Female
- Sole proprietor
- No
- License
- 2018033534 (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
7 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
2 documented practice locations
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
Additional practice locations (1)
- 3800 Park Ave Fl 2Saint Louis, MO 63110-2514Phone: (314) 577-5667Fax: (314) 268-2784
Registry dates
- Enumerated
- 2018-09-28
- Last updated
- 2025-04-28
- Certified
- 2025-04-28
Frequently asked questions
- What is Gillian Mayersohn's NPI number?
- Gillian Mayersohn's National Provider Identifier (NPI) is 1265917884, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gillian Mayersohn's specialty?
- Gillian Mayersohn is listed in the NPPES registry with a primary specialty of Clinical Psychologist (Behavioral Health & Social Service Providers).
- Where is Gillian Mayersohn located?
- Gillian Mayersohn's practice location on file with NPPES is 1465 S Grand Blvd, Saint Louis, MO 63104-1003.
- What is Gillian Mayersohn's phone number?
- The practice phone number listed in the NPPES registry for Gillian Mayersohn is (314) 577-5667.
- Does Gillian Mayersohn accept Medicare?
- Gillian Mayersohn is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gillian Mayersohn's NPI active?
- Yes — Gillian Mayersohn's NPI (1265917884) is active in the NPPES registry as of the last update on 2025-04-28.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.