Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

Dr. William H. Ellis, PHD

Individual provider Clinical Psychologist · NPI 1942278031

Dr. William H. Ellis, PHD is a Clinical Psychologist in Hyannis, Massachusetts. Qualified in 1980, 46 years ago. Practices as a sole proprietor, accepts Medicare assignment and offers telehealth. Licensed in Massachusetts.

Years since qualifying
46
Licensed in
MA
In the registry since
2006
Specialties on file
7
What do these letters mean?
PHD — Doctor of Philosophy
A research doctorate. In healthcare it usually sits alongside a clinical licence.

See every abbreviation used in this directory →

Practice location Address checks out

218 W Main St
Hyannis, MA 02601-3778
Phone: (508) 771-4640
Fax: (508) 790-4880
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Psychologist (primary) Taxonomy 103T00000X · Licence 2809 (MA)
Clinical Psychologist Taxonomy 103TC0700X · Licence 2809 (MA)
Addiction (Substance Use Disorder) Psychologist Taxonomy 103TA0400X · Licence 2809 (MA)
Adult Development & Aging Psychologist Taxonomy 103TA0700X · Licence 2809 (MA)
Clinical Child & Adolescent Psychologist Taxonomy 103TC2200X · Licence 2809 (MA)
Family Psychologist Taxonomy 103TF0000X · Licence 2809 (MA)
Health Service Psychologist Taxonomy 103TH0100X · Licence 2809 (MA)

Record details

NPI number1942278031
Entity typeIndividual (Type 1)
GenderMale
Credentials PHD
Sole proprietorYes
NPI enumeratedMarch 14, 2006
Last updated in NPPESSeptember 11, 2025

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyCLINICAL PSYCHOLOGIST
Medical schoolOTHER
Graduated 1980 (46 years in practice)
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services

Other providers in Hyannis