DR. GILLIAN SLOANE MAYERSOHN PSY.D., ABPP
NPI 1265917884
Psychologist - Clinical in Saint Louis, MO

NPI Status: Active since September 28, 2018

Contact Information

1465 S GRAND BLVD
SAINT LOUIS, MO
ZIP 63104
Phone: (314) 577-5667

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  • Individual
  • Female
  • Years of Experience 9
  • Psychologist
  • Clinical
  • Accepts Insurance
  • Accepts Medicare Approved Payment
  • PECOS Enrolled

About GILLIAN MAYERSOHN

This page provides the complete NPI Profile along with additional information for Gillian Mayersohn, a provider established in Saint Louis, Missouri with a medical specialization in Psychologist, focusing in clinical and more than 9 years of experience. The healthcare provider is registered in the NPI registry with number 1265917884 assigned on September 2018. The practitioner's primary taxonomy code is 103TC0700X with license number 2018033534 (MO). The provider is registered as an individual and her NPI record was last updated April 2025.

NPI
1265917884
Provider Name
DR. GILLIAN SLOANE MAYERSOHN PSY.D., ABPP
Gender
Female
Entity Type
Individual
Location Address
1465 S GRAND BLVD SAINT LOUIS, MO 63104
Location Phone
(314) 577-5667
Mailing Address
1 CHILDRENS PL STE 3N14 SAINT LOUIS, MO 63110
Mailing Phone
(314) 454-6069
Medical School Name
OTHER
Graduation Year
2017
Is Sole Proprietor?
No
Enumeration Date
09-28-2018
Last Update Date
04-28-2025
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A clinical psychologist like Gillian Mayersohn assesses, diagnoses, and treats mental, emotional, and behavioral disorders. Clinical psychologists help people deal with problems ranging from short-term personal issues to severe, chronic conditions. Clinical psychologists interview patients, give diagnostic tests, provide psychotherapy and design behavior modification programs to help patients.

Location Map

Secondary Locations

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

Specialty - Primary Taxonomy

The NPI enumerator requires providers to submit at least one taxonomy code. A taxonomy code is a unique 10-character code that describes the healthcare provider type, classification, and the area of specialization. There could be only one primary taxonomy code per NPI record. For individual NPIs the license data is associated to the taxonomy code.

Classification

Psychologist Clinical

Taxonomy Code
103TC0700X
Type
Behavioral Health & Social Service Providers
License No.
2018033534
License State
MO
Taxonomy Description
A psychologist who provides continuing and comprehensive mental and behavioral health care for individuals and families; consultation to agencies and communities; training, education and supervision; and research-based practice. It is a specialty in breadth -- one that is broadly inclusive of severe psychopathology -- and marked by comprehensiveness and integration of knowledge and skill from a broad array of disciplines within and outside of psychology proper. The scope of clinical psychology encompasses all ages, multiple diversities and varied systems.

Insurance Plans Accepted

According to publicly available information the provider might be accepting the following health plans from these health insurance companies:

  • Bronze 1 Advanced: Aetna network + $0 MinuteClinic + $0 CVS Health Virtual Primary Care + Rx Copay - HMO
  • Bronze 2 Advanced HSA: Aetna network + CVS Health Virtual Primary Care - EPO
  • Bronze 4 Advanced: $0 PCP + Aetna network + $0 MinuteClinic + $0 CVS Health Virtual Primary Care - HMO
  • Bronze 4 Advanced: $0 PCP + Aetna network + $0 MinuteClinic + Adult Dental + Vision - HMO
  • Bronze 4 Advanced: Aetna network + $0 CVS Health Virtual Primary Care - EPO
  • Bronze 4 Advanced: Aetna network + $0 CVS Health Virtual Primary Care + Adult Dental + Vision - EPO
  • Bronze S: Aetna network + $0 CVS Health Virtual Primary Care - EPO
  • Bronze S: Aetna network + $0 MinuteClinic + $0 CVS Health Virtual Primary Care - HMO
  • Gold 10 Advanced: $0 PCP + Aetna network + $0 MinuteClinic + $0 CVS Health Virtual Primary Care - HMO
  • Gold 10 Advanced: $0 PCP + Aetna network + $0 MinuteClinic + Adult Dental + Vision - HMO
  • Gold 3 Advanced: Aetna network + $0 MinuteClinic + $0 CVS Health Virtual Primary Care + Rx Copay - HMO
  • Gold 3 Advanced: Aetna network + $0 MinuteClinic + Adult Dental + Vision + Rx Copay - HMO
  • Gold S: Aetna network + $0 CVS Health Virtual Primary Care - EPO
  • Gold S: Aetna network + $0 MinuteClinic + $0 CVS Health Virtual Primary Care + Rx Copay - HMO
  • Silver 10 Advanced: $0 PCP + Aetna network + $0 MinuteClinic + $0 CVS Health Virtual Primary Care - HMO
  • Silver 10 Advanced: $0 PCP + Aetna network + $0 MinuteClinic + Adult Dental + Vision - HMO
  • Silver 10 Advanced: Aetna network + $0 CVS Health Virtual Primary Care - EPO
  • Silver 10 Advanced: Aetna network + $0 CVS Health Virtual Primary Care + Adult Dental + Vision - EPO
  • Silver 5 Advanced: Aetna network + $0 CVS Health Virtual Primary Care - EPO
  • Silver 5 Advanced: Aetna network + $0 MinuteClinic + $0 CVS Health Virtual Primary Care + Rx Copay - HMO
  • Balance by Medica Bronze $0 Copay PCP Visits - EPO
  • Balance by Medica Bronze Premier - EPO
  • Balance by Medica Catastrophic - EPO
  • Balance by Medica Expanded Bronze Standard - EPO
  • Balance by Medica Gold $0 Copay PCP Visits - EPO
  • Balance by Medica Gold Share - EPO
  • Balance by Medica Gold Standard - EPO
  • Balance by Medica Silver $0 Copay PCP Visits - EPO
  • Balance by Medica Silver Share - EPO
  • Balance by Medica Silver Standard - EPO
  • Medica with MU Health Care Bronze $0 Copay PCP Visits - EPO
  • Medica with MU Health Care Bronze Premier - EPO
  • Medica with MU Health Care Catastrophic - EPO
  • Medica with MU Health Care Expanded Bronze Standard - EPO
  • Medica with MU Health Care Gold $0 Copay PCP Visits - EPO
  • Medica with MU Health Care Gold Share - EPO
  • Medica with MU Health Care Gold Standard - EPO
  • Medica with MU Health Care Silver $0 Copay PCP Visits - EPO
  • Medica with MU Health Care Silver Share - EPO
  • Medica with MU Health Care Silver Standard - EPO

*Please verify directly with this provider to make sure your insurance plan is currently accepted.

Medicare Participation & PECOS Enrollment Status

Gillian Mayersohn is registered with Medicare and accepts claims assignment, this means the provider accepts the approved amount for the cost of rendered services as full payment. Participating providers may not charge beneficiaries more than the approved amount for their services. Please keep in mind that beneficiaries still have to pay a coinsurance or copayment amount for a visit or service.

Gillian Mayersohn is enrolled in PECOS and is eligible to order or refer health care services for Medicare patients. The provider is eligible to order or refer: Part B Clinical Laboratory and Imaging and Durable Medical Equipment (DME).

What is PECOS?
PECOS is the online Medicare enrollment management system or Provider, Enrollment, Chain and Ownership System. The PECOS system is a database of providers who have registered with CMS as providers or suppliers. PECOS is the primary source of information about verified Medicare professionals. Providers that want to participate in this program need to enroll in PECOS with their NPI number to avoid denied claims.

  • Is the provider registered in PECOS? Yes

  • PECOS PAC ID: 4183960263

    What is the PECOS Associate Control ID?
    A PAC ID is a unique 10-digit number assigned to an individual or organization healthcare provider in PECOS. The PAC ID is used to link together all the provider information, like tax identification numbers and organizational names. A PAC ID can be connected to multiple Enrollment IDs if an individual or organization has enrolled in PECOS more than once.

  • PECOS Enrollment ID: I20190110000785

    What is the Provider Enrollment ID?
    The Enrollment ID is a unique alphanumeric 15-digit code assigned to each new provider's PECOS enrollment application. The Enrollment ID is used to link together all the provider enrollment information like enrollment type, state, provider specialty, and reassignment of benefits.

  • Accepts Medicare Assignment? Yes

    What does it mean "accepts medicare assignment"?
    When a provider accepts Medicare assignment, the provider agrees to be paid directly by Medicare and to accept the payment amount approved by Medicare. Additionally, the provider agrees to not bill patients for more than the Medicare deductible and coinsurance amounts.
    A provider who doesn't accept assignment may charge you up to 15% over the Medicare-approved amount. This is known as the limiting charge. You may have to pay this amount, or it may be covered by another insurer.

  • Eligible to Order or Refer Part B Clinical Laboratory and Imaging: Yes

  • Eligible to Order or Refer Durable Medical Equipment (DMEPOS): Yes

  • Eligible to Order or Refer a Home Health Agency (HHA): No

  • Eligible to Order or Refer Power Mobility Devices: No

Physician Visit Costs



The typical physician office visit costs for Medicare beneficiaries in this area are: $42.34 for a new patient copayment and $24.59 for an established patient copayment.

The pricing information below displays the copayment minimum, maximum and average amount that patients under Medicare are charged when visiting this provider as a new or established patient. Please keep in mind that these prices are just for reference purposes, and the actual prices charged by the provider might be different.

For patients covered under private health plans the prices below are also useful as healthcare pricing for private insurance is usually established as a function of Medicare prices. Private insurance covered patients should check their individual plans to determine the exact pricing.

The prices below reflect the costs for new and established patients in the 63104 ZIP code area.

New Patients Visit Costs *

The most utilized procedure code for new patients office visits is 99205

  • Average New Patient Price $169.38
  • Minimum New Patient Price $55.65
  • Maximum New Patient Price $169.38
  • Average New Patient Copayment $42.34
  • Minimum New Patient Copayment $13.91
  • Maximum New Patient Copayment $42.34

Established Patients Visit Costs *

The most utilized procedure code for established patients office visits is 99214

  • Average Established Patient Price $98.37
  • Minimum Established Patient Price $17.76
  • Maximum Established Patient Price $137.92
  • Average Established Patient Copayment $24.59
  • Minimum Established Patient Copayment $4.44
  • Maximum Established Patient Copayment $34.48

* The physician office visit costs information is generated by statistical analysis of similar providers in the same geographical area. The pricing information above IS NOT the amount charged by this provider.

Find Provider Hospital Affiliations - Privileges

Doctors and physicians must apply for hospital privileges to treat patients at hospitals. Find out if your doctor has privileges to practice at your preferred hospital by using the hospital affiliation information below based on recent medical claims.

Hospital affiliation is identified through self-reporting data, inpatient, outpatient, physician and ancillary service claims linked by the medical claims NPI number and place of service code. Additionally, to further determine provider hospital affiliation the clinician must have provided services to at least three patients on three different dates in the last 12 months. Gillian Mayersohn is affiliated with the following medical facilities:

Hospital Name Address Phone Hospital Type Overall Rating
SSM HEALTH ST MARY'S HOSPITAL - ST LOUIS6420 CLAYTON RD
RICHMOND HEIGHTS, MO 63117
(314) 768-8000Acute Care Hospitals

Reviews for DR. GILLIAN SLOANE MAYERSOHN PSY.D., ABPP

There are currently no reviews for this provider. Be the first person to share your experience with this provider by filling out our review form. Your insights are appreciated and will help others make informed decisions.

NPI Validation Check Digit Calculation


The following table explains the step by step NPI number validation process using the ISO standard Luhn algorithm.

Start with the original NPI number, the last digit is the check digit and is not used in the calculation.
1265917884
Step 1: Double the value of the alternate digits, beginning with the rightmost digit.
2212518114816
Step 2: Add all the doubled and unaffected individual digits from step 1 plus the constant number 24.
2 + 2 + 1 + 2 + 5 + 1 + 8 + 1 + 1 + 4 + 8 + 1 + 6 + 24 = 66
Step 3: Subtract the total obtained in step 2 from the next higher number ending in zero, the result is the check digit.
70 - 66 = 44

The NPI number 1265917884 is valid because the calculated check digit 4 using the Luhn validation algorithm matches the last digit of the original NPI number.

Other Providers at the Same Location


The following 20 providers are registered at the same or nearby location.

NPI Name / Type Taxonomy Address
1114970696 ADRIENNE G TILBOR DO
Individual
Physical Medicine & Rehabilitation1465 S GRAND BLVD
SAINT LOUIS, MO 63104
(314) 577-5600
1841243888 CYNTHIA KARDESCH MD
Individual
Physical Medicine & Rehabilitation1465 S GRAND BLVD
SAINT LOUIS, MO 63104
(314) 577-5600
1477507945 SOHAIL MAQBOOL MD
Individual
Radiology (Diagnostic Radiology)1465 S GRAND BLVD
SAINT LOUIS, MO 63104
(314) 577-5600
1467407841 MEGHAN M GUERRA MD
Individual
Pediatrics1465 S GRAND BLVD
SAINT LOUIS, MO 63104
(314) 268-6406
1710932892 GREGORY LAUNIUS MD
Individual
Radiology (Pediatric Radiology)1465 S GRAND BLVD
SAINT LOUIS, MO 63104
(314) 577-5600
1407802358 BARBARA BARNES PHD
Individual
Psychologist1465 S GRAND BLVD
SAINT LOUIS, MO 63104
(314) 577-5600
1134175847 TIMOTHY W STAED MD
Individual
Pediatrics1465 S GRAND BLVD
SAINT LOUIS, MO 63104
(314) 577-5600
1639125305 KAREN SNYDER MS
Individual
Psychologist1465 S GRAND BLVD
SAINT LOUIS, MO 63104
(314) 577-5600
1851347074 ELLEN SCOTT PHD
Individual
Psychologist1465 S GRAND BLVD
SAINT LOUIS, MO 63104
(314) 577-5600
1316984586 HEATHER HALL MD
Individual
Pediatrics (Neonatal-Perinatal Medicine)1465 S GRAND BLVD
SAINT LOUIS, MO 63104
(314) 577-5642
1679514889DR. AKIHIKO NOGUCHI M.D
Individual
Pediatrics1465 S GRAND BLVD
SAINT LOUIS, MO 63104
(314) 977-6828
1033130588 JAY NOFFSINGER MD
Individual
Pediatrics1465 S GRAND BLVD
SAINT LOUIS, MO 63104
(314) 577-5369
1114937711DR. ALAN PAUL KNUTSEN MD
Individual
Pediatrics (Pediatric Allergy/Immunology)1465 S GRAND BLVD
SAINT LOUIS, MO 63104
(314) 268-4014
1851301097 TERESA B SCHIFF MD
Individual
Pediatrics (Pediatric Emergency Medicine)1465 S GRAND BLVD
SAINT LOUIS, MO 63104
(314) 577-5360
1851302475 DENNIS M O'CONNOR MD
Individual
Pediatrics1465 S GRAND BLVD
SAINT LOUIS, MO 63104
(314) 577-5644
1811908353 ANN DIMAIO MD
Individual
Pediatrics (Pediatric Emergency Medicine)1465 S GRAND BLVD
SAINT LOUIS, MO 63104
(314) 577-5360
1477564763 ROBERT E LYNCH MD
Individual
Pediatrics (Pediatric Critical Care Medicine)1465 S GRAND BLVD
SAINT LOUIS, MO 63104
(314) 577-5395
1497868343 DANIEL R SCHLESINGER MD
Individual
Pediatrics (Pediatric Emergency Medicine)1465 S GRAND BLVD
SAINT LOUIS, MO 63104
(314) 577-5360
1528163706 MARIANNE R DUNSTAN-BRADY MD
Individual
Pediatrics1465 S GRAND BLVD
SAINT LOUIS, MO 63104
(314) 268-6406
1295824811DR. ALBERT K NAKANISHI MD
Individual
Pediatrics (Pediatric Emergency Medicine)1465 S GRAND BLVD
SAINT LOUIS, MO 63104
(314) 577-5360

Frequently Asked Questions

The NPI number assigned to this healthcare provider is 1265917884, enumerated in the NPI registry as an "individual" on September 28, 2018

The provider is located at 1465 S Grand Blvd Saint Louis, Mo 63104 and the phone number is (314) 577-5667

The provider's speciality is Psychologist with taxonomy code 103TC0700X with a focus in Clinical

The provider has more than 9 years of experience.

The provider might be accepting Accepts: Aetna CVS Health and Medica. Please consult your insurance carrier or call the provider to make sure your health plan is currently accepted.

Yes, as of June 20, 2025 the provider is registered in PECOS and is eligible to order health care services or supplies for Medicare patients. If you are a beneficiary the provider is eligible to order or refer: Part B Clinical Laboratory and Imaging and Durable Medical Equipment (DME).

Medicare beneficiaries should expect a typical cost of $169.38 with an average copayment of $42.34 for new patient appointments. Established patients should expect a typical charge of $98.37 and an average copayment of 24.59. Please review your insurance plan or contact the provider directly to determine your specific costs.

The practitioner is affiliated to the following hospital(s): SSM HEALTH ST MARY'S HOSPITAL - ST LOUIS. Hospital affiliations are identified through self-reporting data and service claims based on the place of service.

This NPI record was last updated on September 28, 2018. To officially update your NPI information contact the National Plan and Provider Enumeration System (NPPES) at 1-800-465-3203 (NPI Toll-Free) or by email at [email protected].
NPI Profile data is regularly updated with the latest NPI registry information, if you would like to update or remove your NPI Profile in this website please contact us.