Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Dr. Gillian Sloane Mayersohn, PSYD, ABPP

Individual provider Clinical Psychologist · NPI 1265917884

Dr. Gillian Sloane Mayersohn, PSYD, ABPP is a Clinical Psychologist in Saint Louis, Missouri. Qualified in 2017, 9 years ago. Practices with SSM Cardinal Glennon Children's Hospital, a 33-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Missouri.

Years since qualifying
9
Licensed in
MO
In the registry since
2018
What do these letters mean?
PSYD — Doctor of Psychology
A doctoral psychologist trained primarily for clinical practice.

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Practice location Address checks out

1465 S Grand Blvd
Saint Louis, MO 63104-1003
Phone: (314) 577-5667
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 3800 Park Ave Fl 2, Saint Louis, MO 63110-2514 — (314) 577-5667

Specialties & licences

Clinical Psychologist (primary) Taxonomy 103TC0700X · Licence 2018033534 (MO)

Record details

NPI number1265917884
Entity typeIndividual (Type 1)
GenderFemale
Credentials PSYD , ABPP
Sole proprietorNo
NPI enumeratedSeptember 28, 2018
Last updated in NPPESApril 28, 2025
Certification dateApril 28, 2025

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyCLINICAL PSYCHOLOGIST
Medical schoolOTHER
Graduated 2017 (9 years in practice)
Group practice Ssm Cardinal Glennon Children'S Hospital — 33 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients11
Services billed 40 a service is one billed item, such as a visit, a test or a procedure

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

  • Ssm Health St Mary'S Hospital - St Louis Hospital · Saint Louis, MO

Colleagues at SSM Cardinal Glennon Children's Hospital

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 33 clinicians in the practice; 12 are shown here.

Other providers in Saint Louis