Dr. John Walker , PsyD
Psychologist โข Phoenix, AZ
3550 N Central Ave, Ste 1407
Phoenix, AZ 850122112
This profile restates public CMS/NPPES data; T-MedInfo gives no medical advice — consult a licensed professional, and call 911 for emergencies.
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NPI assigned on February 8, 2007; this date does not establish years in practice.
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Published CMS data list 110 Original Medicare Part B services in 2021.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2021. Published rows only; this is not a quality measure.
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Published Part B service records, 2021:
- 96133 โ Evaluation of neuropsychological test, each additional hour: 38 service units.
- 96137 โ Administration of psychological or neuropsychological test: 36 service units.
- 90791 โ Psychiatric diagnostic evaluation: 12 service units.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2021. Units differ by code; these are not visits or a measure of quality.
CPTยฎ only copyright 2020 American Medical Association. All rights reserved. Service names are shortened from CPT Consumer Friendly Descriptors (CMS data, 2021). CPT notice
See all 5 records in the table ยท Guide: How to read Medicare Part B data
Practice Location & Contact Primary Location
3550 N Central Ave
Ste 1407
Phoenix, AZ 850122112
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
CMS Doctors and Clinicians lists 1 group name: Desert Vista Neuropsychological Specialists Pllc. See the list
Source: CMS Doctors and Clinicians National Downloadable File, CMS release of October 2, 2026.
Listings do not confirm current availability, employment or a shared ownership network.
Medicare Profile & Education
Source: CMS Doctors and Clinicians National Downloadable File, CMS release of October 2, 2026
2002
What Public CMS Data Show
Psychologist: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare patients
16 people with Original Medicare in 2021
It gives a sense of how many people with Medicare this clinician treated that year.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider, 2021.
Medicare-allowed amount
About $9,586 in 2021
The total amount Medicare approved for these services in 2021. It includes what Medicare paid and what patients or their other insurance owed, such as the deductible and coinsurance.
It shows the total cost of this clinician's Original Medicare services under Medicare's fee rules.
What this does not show: Medicare-allowed amount
This is not the clinician's income. Part of it can go to a clinic or group practice, staff, equipment or drugs. It is not the price you will pay.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2021.
Paid by Medicare
About $7,669 in 2021
The part of the Medicare-allowed amount that Medicare itself paid in 2021, after patients' deductibles and coinsurance.
The gap between the allowed amount and this number is roughly what patients and their other insurance paid.
What this does not show: Paid by Medicare
This is not the clinician's income and not a measure of quality.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2021.
Years since graduation
24 years (graduated 2002)
CMS Doctors and Clinicians data list 2002 as the year this clinician finished professional school.
It tells you roughly how long ago the clinician finished school.
What this does not show: Years since graduation
It is not the number of years in practice, and more years does not mean better care.
Source: CMS Doctors and Clinicians National Downloadable File, CMS release of October 2, 2026.
NPI first issued
2007
The year this clinician's National Provider Identifier (NPI) was issued. An NPI is a unique 10-digit ID that US health care providers use for billing.
What this does not show: NPI first issued
NPIs have been issued only since 2005, so this year is not necessarily when the clinician started practicing.
Source: CMS NPPES NPI Registry.
Accepts Medicare assignment
CMS data list this clinician as accepting Medicare assignment. This means agreeing to take the Medicare-approved amount as full payment for covered services.
With Original Medicare, you usually pay only your deductible and coinsurance, and the office sends the claim to Medicare for you.
Medicare assignment applies to Original Medicare. It does not tell you whether the clinician is in a Medicare Advantage plan's network, accepts other insurance, or is taking new patients.
Source: CMS Doctors and Clinicians, CMS release of October 2, 2026; Medicare.gov, โDoes your provider accept Medicare as full payment?โ
No telehealth indicator
CMS shows this indicator only when recent Medicare claims include telehealth services. The clinician may still offer telehealth; ask the office.
Source: CMS, Telehealth Indicator on Medicare Care Compare (fact sheet, January 2023); CMS Doctors and Clinicians, CMS release of October 2, 2026.
Enrolled in Medicare (PECOS)
Dr. Walker has a Medicare enrollment record in PECOS, the CMS system clinicians use to enroll so they can bill Medicare or order services for people with Medicare.
It does not show whether the clinician accepts assignment, is in your plan's network, or is taking new patients.
Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.
Can order Medicare-covered services
CMS lists Dr. Walker as eligible to order or refer Medicare Part B clinical laboratory and imaging services and durable medical equipment (DME) for people with Medicare.
Medicare pays for these items and services only when they are ordered by an eligible clinician.
What this does not show: Can order Medicare-covered services
It does not mean the clinician offers these services directly.
Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.
Compared with the same specialty in Phoenix and Arizona
Billing and prescribing volume is not a quality rating.
Medicare Part B
Comparisons use 2024 data. The latest CMS data for Dr. Walker are from 2021.
211 active clinicians are listed under Psychologist with a practice address in Phoenix, AZ (731 in Arizona).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Phoenix
7.1% of these 211 clinicians have the CMS telehealth indicator.
12.8% of these 211 clinicians are listed by CMS as accepting Medicare assignment.
CMS data by year
Changes may reflect reporting, coverage or privacy limits, not changes in care quality.
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Medicare Part B services
CMS data for Medicare Part B services are available for 2021 only.
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Medicare-allowed amount
CMS data for Medicare-allowed amount are available for 2021 only.
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Paid by Medicare
CMS data for Medicare payment amount are available for 2021 only.
Sources: CMS Medicare Physician & Other Practitioners (2021), CMS Doctors and Clinicians, CMS release of October 2, 2026, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.
Text: T-MedInfo ยท Report an error.
Performed Procedures & Service Volume
CPTยฎ is a registered trademark of the American Medical Association. CPT codes, descriptions and other data only are copyright 2020 American Medical Association. All rights reserved. Applicable FARS/HHSARS apply. Descriptions of CPT codes are the AMA's CPT Consumer Friendly Descriptors as published by CMS in the Medicare Physician & Other Practitioners โ by Provider and Service data, 2021; they are plain-language summaries, not for clinical coding or documentation. HCPCS Level II codes and descriptions are from CMS. Fee schedules, relative value units, conversion factors and/or related components are not assigned by the AMA, are not part of CPT, and the AMA is not recommending their use. The AMA does not directly or indirectly practice medicine or dispense medical services. The AMA assumes no liability for data contained or not contained herein.
| HCPCS Code | Services | Patients | Submitted Charge | Medicare Allowed |
|---|---|---|---|---|
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96133
Evaluation of neuropsychological test, each additional hour
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38 | 12 | $302.22 | $102.04 |
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96137
Administration of psychological or neuropsychological test, each additional 30 minutes
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36 | 12 | $130.26 | $40.54 |
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90791
Psychiatric diagnostic evaluation
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12 | 12 | $400.00 | $178.00 |
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96132
Evaluation of neuropsychological test, first hour
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12 | 12 | $396.18 | $130.81 |
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96136
Administration of psychological or neuropsychological test, first 30 minutes
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12 | 12 | $140.91 | $45.27 |
Source: CMS Part B by Provider and Service, 2021; services under 11 beneficiaries omitted by CMS. Privacy limits
Submitted charges are billed amounts, not a price quote for your visit.
Specialties & License Numbers Reported to NPPES
NUCC Taxonomy Code: 103T00000X
A psychologist is an individual who is licensed to practice psychology which is defined as the observation, description, evaluation, interpretation, and modification of human behavior by the application of psychological principles, methods, and procedures, for the purpose of preventing or eliminating symptomatic, maladaptive, or undesired behavior and of enhancing interpersonal relationships, work and life adjustment, personal effectiveness, behavioral health, and mental health. The practice of psychology includes, but is not limited to, psychological testing and the evaluation or assessment of personal characteristics, such as intelligence, personality, abilities, interests, aptitudes, and neuropsychological functioning; counseling, psychoanalysis, psychotherapy, hypnosis, biofeedback, and behavior analysis and therapy; diagnosis and treatment of mental and emotional disorder or disability, alcoholism and substance abuse, disorders of habit or conduct, as well as of the psychological aspects of physical illness, accident, injury, or disability; and psycheducational evaluation, therapy, remediation, and consultation. Psychological services may be rendered to individuals, families, groups and the public.
NUCC Taxonomy Code: 103G00000X
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.
NUCC Taxonomy Code: 103TB0200X
A psychologist who reflects an experimental-clinical approach distinguished by use of principles of human learning and development and theories of cognitive processing to promote meaningful change in maladaptive human behavior and thinking.
NUCC Taxonomy Code: 103TC0700X
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.
NUCC Taxonomy Code: 103TH0100X
A psychologist, certified/licensed at the independent practice level in his/her state, who is duly trained and experienced in the delivery of direct, preventative, assessment, and therapeutic intervention services to individuals whose growth, adjustment, or functioning is actually impaired or is demonstrably at high risk of impairment (1974).
NUCC Taxonomy Code: 103TR0400X
A psychologist who specializes in the study and application of psychological principles on behalf of persons who have disability due to injury or illness. Rehabilitation psychologists, often within teams, assess and treat cognitive, emotional, and functional difficulties, and help people to overcome barriers to participation in life activities. Rehabilitation psychologists are involved in practice, research, and advocacy, with the broad goal of fostering independence and opportunity for people with disabilities.
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - CLINICAL PSYCHOLOGIST
I20080612000376
AZ
1557432978
Sources: CMS Provider Enrollment and Order and Referring. Medicare enrollment is a billing status, not an accreditation or quality rating.
Medicare Group Practice Enrollments
Source: CMS Doctors and Clinicians National Downloadable File, CMS release of October 2, 2026
Desert Vista Neuropsychological Specialists Pllc
3550 N Central Ave, Phoenix, AZ 850122112
Phone: 6022166900
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Psychologist - Cognitive & Behavioral
Doctor of Psychology (Psy.D.)
Clinical Neuropsychologist
Doctor of Philosophy (Ph.D.)
Career & Practice History Timeline
Changes recorded in monthly NPPES data files: addresses, names, credentials, specialties and NPI status
Registered at 3550 N CENTRAL AVE, STE 1407, PHOENIX, AZ 850122112 (Tel: 6022166900)
Registered at 3550 N CENTRAL AVE, STE 1407, PHOENIX, AZ 850122112 (Tel: 6022166900)
NPI status registered as active in NPPES database
Registered at 7227 N 16TH ST, SUITE 219, PHOENIX, AZ 850205251 (Tel: 6022166900)
Registered at 7227 N 16TH ST, SUITE 219, PHOENIX, AZ 850205251 (Tel: 6022166900)
Recorded as JOHN WALKER, PSYD
Clinical Neuropsychologist (license number reported to NPPES: AZ 3593)
First registered as active Individual Practitioner in NPPES Database.
NPI Administrative Meta
Other Psychologists in Phoenix
- Dr. Lindsay Mills, PhD
- Dr. Andrew Krueger, PsyD
- Dr. Neal Olshan, PhD
- Dr. Douglas Thompson, PhD
- Dr. Petra Peper, PhD
- Dr. Dawn Byrd, PsyD
Mailing Address
3550 N Central Ave, Ste 1407
Phoenix, AZ 850122112
Phone: 6022166900