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DR. JULIE L. GUAY PSY.D., ABPP
NPI 1831331420
Clinical Neuropsychologist in Berwyn, PA

Active since March 30, 2009PECOS EnrolledAccepts Medicare Assignment
1199 LANCASTER AVE STE 110, BERWYN, PA 19312(610) 241-4331 Get Directions Write a Review

NPPES record last updated: March 28, 2025. Verified against the NPPES registry weekly; last sync: November 01, 2026.

Record update history: Mar 28, 2025, Aug 2, 2021, Jun 16, 2020 and 1 more (4 updates tracked since 2018).

About Dr. Julie L. Guay Psy.d., Abpp NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. JULIE L. GUAY PSY.D., ABPP (NPI 1831331420) is an individual clinical neuropsychologist in Berwyn, Pennsylvania, licensed in Pennsylvania (PS016479) and active in the NPI registry since March 2009. She is enrolled in Medicare PECOS and is a graduate of Other (2006).

NPPES Registry Identity

NPI1831331420
Entity TypeIndividualFemale
Primary Taxonomy103G00000X
Provider Legal NameDR. JULIE L. GUAYCredential: PSY.D., ABPP
Location Address1199 LANCASTER AVE STE 110Berwyn, PA 19312-1341
Mailing Address1199 Lancaster Ave Ste 110Berwyn, PA 19312-1341 · (610) 241-4331 · Fax (484) 416-0560
Phone(610) 241-4331
Sole ProprietorYes
Medical School CMSOtherGraduated 2006
Enumeration DateMarch 30, 2009
Last NPPES UpdateMarch 28, 20254 updates tracked since enumeration
NPPES CertifiedMarch 28, 2025
✔ NPI 1831331420 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyClinical NeuropsychologistBehavioral Health & Social Service Providers
Taxonomy Code103G00000X
License✔ Licensed in PA · PS016479
Definition
A clinical psychologist who applies principles of assessment and intervention based upon the scientific study of human behavior as it relates to normal and abnormal functioning of the central nervous system. The specialty is dedicated to enhancing the understanding of brain-behavior relationships and the application of such knowledge to human problems.
1199 LANCASTER AVE STE 110, Berwyn, PA 19312
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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Julie L. Guay Psy.d., Abpp is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID9234399064
PECOS Enrollment IDI20120402000080
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment– Home Health Agency– Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignment

Medicare enrollment records show Julie Guay reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Neuropsychological Assessment And Therapy Services, LLC
Same address
Clinical Neuropsychologist
1199 LANCASTER AVE STE 110
Berwyn, PA 19312
  • Reassigned Medicare billing, Pennsylvania enrollment
  • 4 clinicians in this Medicare group
NPI 1104202902 (610) 241-4331

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 5

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Administration of psychological or neuropsychological test by technician, each additional 30 minutes 96139
This service involves a technician administering additional psychological or neuropsychological testing. Each session lasts for an extra 30 minutes. These tests assess cognitive abilities, such as memory, attention, and problem-solving skills, to aid in diagnosing or monitoring mental health conditions.
462 services64 patients
Evaluation of neuropsychological test, each additional hour 96133
This service involves further evaluation of your neuropsychological test results beyond the initial hour. It helps to understand your cognitive functioning better, focusing on areas like memory, attention, and problem-solving skills.
329 services68 patients
Psychiatric diagnostic evaluation 90791
A psychiatric diagnostic evaluation is a thorough assessment used to identify any mental health conditions you may have. It involves a detailed discussion about your symptoms, thoughts, feelings and behavior patterns. Your medical history and family's mental health history are also considered.
72 services68 patients
Evaluation of neuropsychological test, first hour 96132
An evaluation of neuropsychological tests is a process to assess your brain's function. It involves tasks designed to measure cognitive abilities such as memory, attention, problem-solving, and language skills. The first hour involves initial testing and observation.
72 services68 patients
Administration of psychological or neuropsychological test by technician, first 30 minutes 96138
This procedure involves a trained technician administering a psychological or neuropsychological test. It's a process that assesses your mental function and behavior. The initial session will last 30 minutes. The aim is to understand your cognitive abilities better.
68 services64 patients

Other Providers at the Same Location NPPES 3

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

NEUROPSYCHOLOGICAL ASSESSMENT AND THERAPY SERVICES, LLC
Clinical Neuropsychologist
1199 LANCASTER AVE STE 110
BERWYN, PA 19312
Chester County (610) 241-4331
JAMIE VANARTSDALEN PSYD
Clinical Neuropsychologist
1199 LANCASTER AVE STE 110
BERWYN, PA 19312
Chester County (610) 241-4331
DR. JULIE ELIZABETH KEAVENEY PSY.D.
Clinical Neuropsychologist
1199 LANCASTER AVE STE 110
BERWYN, PA 19312
Chester County (610) 241-4331

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Julie Guay's NPI number?

The NPI number for Julie Guay is 1831331420. It was assigned to this individual provider in the NPPES registry on March 30, 2009.

Where is Julie Guay located?

Julie Guay practices at 1199 Lancaster Ave Ste 110, Berwyn, PA 19312. The listed phone number is (610) 241-4331.

What is Julie Guay's specialty?

The primary specialty registered for this NPI is Clinical Neuropsychologist with taxonomy code 103G00000X.

Is Julie Guay enrolled in Medicare?

Yes. Julie Guay is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organization bills Medicare for Julie Guay's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Julie Guay reassigns Medicare benefits to Neuropsychological Assessment And Therapy Services, LLC (Berwyn, PA). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Julie Guay's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Julie Guay was last updated on March 28, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 19 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.