NPPES file of Aug 9, 2026

Gillian Sloane Mayersohn, PSY.D., ABPP

Clinical Psychologist · Saint Louis, MO

Gillian Sloane Mayersohn, PSY.D., ABPP is a clinical psychologist with a practice address in Saint Louis, Missouri, and NPI 1265917884, issued on Sep 28, 2018. Check the license (Missouri 2018033534, as entered in NPPES) with the Missouri board that licenses this profession; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1265917884
Name
Gillian Sloane Mayersohn
Credential
PSY.D., ABPP
Primary taxonomy
Clinical Psychologist 103TC0700X
License number
2018033534 MO
Self-reported in NPPES; status is on the state search
Practice location
1465 S Grand Blvd, Saint Louis, MO 63104
Phone
(314) 577-5667
Enumerated
Sep 28, 2018
Record last updated
Apr 28, 2025
Medicare enrollment
Enrolled (PECOS I20190110000785); accepts Medicare assignment
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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8 nearest clinical psychologist records → All 911 in Missouri → Look up another NPI →

Also registered at 1465 S Grand Blvd

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Nabil Abboud, MDAnesthesiology Physician1386660504
  2. Elaf AbdelmagidPediatrics Physician1831077627
  3. Michel Adonis, M.D.Pediatrics Physician1497190854
  4. Attila Ahmad, MDPediatric Cardiology Physician1245842699
  5. Emily Ahmad, CPNP-PCPediatric Nurse Practitioner1871875104
  6. Muteen Ahmed, M.B.B.S.Student in an Organized Health Care Education/Training Program1437950466

Verify Gillian Sloane Mayersohn in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersWhich Missouri board licenses this profession
    Search for license 2018033534    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Find the Missouri license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

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Bills Medicare through one group practice

  1. Ssm Cardinal Glennon Children's HospitalSaint Louis, MO

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

Gillian Sloane Mayersohn among 911 clinical psychologist records in Missouri

Gillian Sloane Mayersohn, PSY.D., ABPP is one of 911 clinical psychologist records with a practice address in Missouri. 16% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2018, is newer than 82% of them.

  • NPI issued2018 · 82% of these records are older, 16% newer
  • In a Medicare fileYes · 16% of these records are
  • In the CMS Doctors and Clinicians fileYes · 23% of these records are
  • Graduated2017 · median 2007 among the 214 with a school on file
  • Record last updated2025 · 59% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 103TC0700X and a Missouri practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Clinical Psychologist providers in Missouri

There are 911 clinical psychologist records in Missouri.

All 911 in Missouri → Every provider in Saint Louis → Clinical Psychologist nationwide →

The 8 clinical psychologist records with the nearest ZIP codes

  1. Suma Chand, PH.D.Saint Louis, MO 631041871614172
  2. Debra Emery, PH.D.Saint Louis, MO 631041356898928
  3. Sarah Hanly, PH.D.Saint Louis, MO 631041003142480
  4. Janet Kwan, PHDSaint Louis, MO 631041598314213
  5. Jessica Luitjohan, PSY.D.Saint Louis, MO 631041730381716
  6. Jennifer Marks-Foster, PSYDSaint Louis, MO 631041225289721
  7. Ericka Rutledge, PHDSaint Louis, MO 631041215448527
  8. Raymond Tait, PHDSt Louis, MO 631041225002447

Common questions

What is Gillian Sloane Mayersohn, PSY.D., ABPP's NPI number?

Gillian Sloane Mayersohn, PSY.D., ABPP's National Provider Identifier (NPI) is 1265917884, issued on Sep 28, 2018. An NPI identifies a provider in billing; it is not a license.

Where is Gillian Sloane Mayersohn, PSY.D., ABPP located?

The NPPES record lists a practice address at 1465 S Grand Blvd, Saint Louis, MO, 63104. Phone: (314) 577-5667. Providers update this record themselves, so call before visiting.

How can I verify Gillian Sloane Mayersohn, PSY.D., ABPP's license?

NPPES lists Missouri license number 2018033534, as entered by the provider. Search the Missouri board that licenses this profession; the NPPES record confirms identity only.

Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.