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
Mailing address218 W Main St, Hyannis, MA 02601-3778

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