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

William Griffith, PHD

Individual provider Clinical Psychologist · NPI 1780734814

William Griffith, PHD is a Clinical Psychologist in Portsmouth, New Hampshire. Qualified in 1994, 32 years ago. Practices as a sole proprietor and accepts Medicare assignment. Licensed in New Hampshire.

Years since qualifying
32
Licensed in
NH
In the registry since
2007
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 →

Claim this listing Report a problem Suggest an edit

Practice location Address checks out

278 Lafayette Rd Bldg E
Portsmouth, NH 03801-5455
Phone: (603) 436-0854
Fax: (603) 431-8186
Show map & directions

Directions in Google Maps · Apple Maps · OpenStreetMap

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

Specialties & licences

Clinical Psychologist (primary) Taxonomy 103TC0700X · Licence 768 (NH)

Record details

NPI number1780734814
Entity typeIndividual (Type 1)
GenderMale
Credentials PHD
Sole proprietorYes
NPI enumeratedJanuary 11, 2007
Last updated in NPPESMarch 25, 2013

Medicare enrollment

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

Medicare specialtyCLINICAL PSYCHOLOGIST
Medical schoolOTHER
Graduated 1994 (32 years in practice)
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

Other providers in Portsmouth