Dr. William Stephan Coysh , PhD
Psychologist • Berkeley, CA
Notice of NPI Deactivation & Inactive Practice Status
According to official public domain records published by CMS (Centers for Medicare & Medicaid Services) in the National Provider Identifier (NPPES) Registry, Dr. William Coysh has officially deactivated this NPI record and ceased active healthcare practice.
Professional Overview & Biography Verified Profile Summary
Dr. William Coysh, PhD was a registered Psychologist practicing in Berkeley, CA. Throughout an active medical career spanning 12 years, Dr. Coysh provided care at the practice location at 1820 SCENIC AVE until profile deactivation on 2025-04-24.
Practice Location & Contact Primary Location
1820 Scenic Ave
Berkeley, CA 947091324
Specialty Benchmarks & Practice Insights
Comparative analytics for Psychologist in Berkeley, CA
Practicing in Berkeley, CA (7695 Statewide)
In-Person Office Visits Only
Under CMS Medicare Fee Schedule vs Standard Submitted Charges
Medical Specialties & State Licenses
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.
Practice Associates & Co-Workers
Healthcare professionals and specialists practicing at this location or sharing practice phone/fax
Counselor - Addiction (Substance Use Disorder)
Counselor - Addiction (Substance Use Disorder)
RADTI
Counselor - Addiction (Substance Use Disorder)
Counselor - Mental Health
MFTINTERN
Registered Nurse - Addiction (Substance Use Disorder)
Registered Nurse
Counselor - Addiction (Substance Use Disorder)
Career & Practice History Timeline
Chronological log of verified NPI updates, location relocations, credentials, and registry changes
Record deactivated on April 24, 2025
NPI status registered as active in NPPES database
Registered at 1820 SCENIC AVE, BERKELEY, CA 947091324 (Tel: 5105487270)
Registered at 1820 SCENIC AVE, BERKELEY, CA 94709 (Tel: 5105487270)
Recorded as WILLIAM COYSH, PHD
Psychologist (License #PSY9468 in CA)
First registered as active Individual Practitioner in NPPES Database.
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NPI Administrative Meta
Mailing Address
1820 Scenic Ave
Berkeley, CA 94709
Phone: 5105487270
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