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

Dr. William Douglas Gammon, PHD

Individual provider Clinical Psychologist · NPI 1306892898

Dr. William Douglas Gammon, PHD is a Clinical Psychologist in Billerica, Massachusetts. Qualified in 1978, 48 years ago. Practices as a sole proprietor, accepts Medicare assignment and offers telehealth. Licensed in Massachusetts.

Years since qualifying
48
Licensed in
MA
In the registry since
2006
What do these letters mean?
PHD — Doctor of Philosophy
A research doctorate. In healthcare it usually sits alongside a clinical licence.

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Practice location Address checks out

572 Boston Rd Ste 14
Billerica, MA 01821-3776
Phone: (781) 696-2070
Fax: (978) 294-8977
Show map & directions

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

Specialties & licences

Clinical Psychologist (primary) Taxonomy 103TC0700X · Licence 2402 (MA)

Record details

NPI number1306892898
Entity typeIndividual (Type 1)
GenderMale
Credentials PHD
Sole proprietorYes
NPI enumeratedMay 26, 2006
Last updated in NPPESMarch 4, 2015
Mailing address572 Boston Rd, Suite 14, Billerica, MA 01821

Medicare enrollment

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

Medicare specialtyCLINICAL PSYCHOLOGIST
Medical schoolOTHER
Graduated 1978 (48 years in practice)
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services
Practice locations2 on file with Medicare

Other providers in Billerica