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Dr. William Bentley Nash , PhD

Psychologist • Williston, VT

Active NPI 1689639742 Individual Practitioner Male Practitioner
Practice location in NPPES

4185 St George Rd
Williston, VT 054957695

Call 8026517735 Location details and other listings
Medical Disclaimer

This profile restates public CMS/NPPES data; T-MedInfo gives no medical advice — consult a licensed professional, and call 911 for emergencies.

Practice Location & Contact Primary Location

Practice Address

4185 St George Rd

Williston, VT 054957695

Telephone 8026517735
Fax 8028795335
Organization at the Same NPPES Address or Phone
Erin K. Hall, Md Pllc Facility NPI 1457645988

Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.

NPI first issued

2006

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.

Medicare assignment not listed

CMS data do not show whether this clinician accepts Medicare assignment. This does not mean they do not accept Medicare. Ask the office.

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; Medicare.gov, “Does your provider accept Medicare as full payment?”

Guide: What Medicare assignment means

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.

Guide: How Medicare covers telehealth

Compared with the same specialty in Williston and Vermont

9 active clinicians are listed under Psychologist with a practice address in Williston, VT (260 in Vermont).

Addresses are self-reported to NPPES and may be out of date.

Sources: CMS Doctors and Clinicians, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.

Text: T-MedInfo · Report an error.

Specialties & License Numbers Reported to NPPES

Psychologist Primary Specialty

NUCC Taxonomy Code: 103T00000X

License # reported to NPPES VT 048-00421

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.

Check License Status with the State Board License numbers are self-reported to NPPES; T-MedInfo does not confirm them against state records. Current status: Vermont State Medical Licensing Board.
Look Up on State Board Site

Additional State Medicaid & Healthcare Payer Identifiers

Medicaid ID
1002474 (VT)

Clinicians Sharing This Practice Address or Phone

Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.

7 listed
Dr. David Allan , MD

Psychiatry & Neurology - Psychiatry

NPI 1033258850

Doctor of Medicine (M.D.)

Dr. Lisa Angstman , PhD

Psychologist - Clinical

NPI 1104924265

Doctor of Philosophy (Ph.D.)

Rebecca Brooklyn , APRN

Nurse Practitioner - Psychiatric/Mental Health

NPI 1073911947

Advanced Practice Registered Nurse

Jill Entis , LICSW

Social Worker - Clinical

NPI 1598782559

Licensed Independent Clinical Social Worker

Dr. Erin Hall , MD

Psychiatry & Neurology - Psychiatry

NPI 1932329604

Doctor of Medicine (M.D.)

Dr. Robin Lessoff , MD

Psychiatry & Neurology - Child & Adolescent Psychiatry

NPI 1366561904

Doctor of Medicine (M.D.)

Career & Practice History

NPI enumerated April 19, 2006.

No changes to the name, practice address, taxonomy or NPI status in this record have been observed in the monthly NPPES data files from January 2017 to August 2026.

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NPI Administrative Meta

NPI Number: 1689639742
Entity Type:
Individual Provider Physician, Nurse Practitioner, or Solo Healthcare Professional (Type 1 NPI)
Enumeration Date: April 19, 2006
Last Update: July 13, 2026
Sole Proprietor: No

Mailing Address

4185 St George Rd

Williston, VT 054957695

Phone: 8026517735

About This Data NPPES fields (address, phone, specialty, license) are self-reported and may be outdated; Medicare fields follow the CMS dataset named in each section. Correct directly at NPPES.