Psychologist | Clinical Psychology | 48+ years experience

Dr. William Douglas Gammon, PH.D.

572 Boston Rd, Suite 14, Billerica, Massachusetts, 01821-3776

About Dr. William Douglas Gammon

Dr. William Douglas Gammon is a psychologist based in Billerica, Massachusetts with 48 years of experience in Clinical Psychology. He completed his graduation in 1978. He accepts the Medicare-approved amount. Patients will not be billed for any more than the Medicare deductible and coinsurance. Active license number of Dr. William Douglas Gammon is 2402 for Clinical Psychology in Massachusetts. His current practice location is 572 Boston Rd, Suite 14, Billerica. Patients can contact him at 781-696-2070 or can fax him at 978-294-8977. Dr. William Douglas Gammon, PH.D., specializes in Clinical Psychology and his NPI number (Unique professional ID assigned by NPPES) is 1306892898.

Dr. William Douglas Gammon is a mental health professional with highly specialized training in the diagnosis and psychological treatment of mental, behavioral and emotional illnesses, including obsessive-compulsive disorder (OCD). His main focus is on diagnosing and treating mental, emotional, and behavioral disorders. Some of the common disorders that he can treat are learning disabilities, substance abuse, depression, anxiety, and eating disorders.

Practice Information

Dr. William Douglas Gammon's specialty, credentials, practice address, contact phone number and fax are as below. Patients can call on the below given phone number for appointment.

Provider Name Dr. William Douglas Gammon
Specialization Clinical Psychology
Credentials PH.D.
Accepts Medicare Assignment Yes
Experience 48+ years
Graduation Year 1978
Gender Male
Practice Address: 572 Boston Rd, Suite 14
Billerica, MA - 01821-3776
Fax 978-294-8977

Professional Identification Codes

NPI number stands for National Provider Identifier which is a unique 10-digit identification number issued to healthcare providers in the United States by the Centers for Medicare and Medicaid Services (CMS). NPI details are as mentioned below.

PAC ID 5698788420
Enrollment ID I20060724000016
NPI Number1306892898
NPI Enumeration Date: 26 May, 2006
NPI Last Update On: 04 Mar, 2015

Medical Licenses:

Healthcare professionals can hold one or more medical licenses for different specialties in the same state or different states. Related medical licenses for Dr. William Douglas Gammon are as mentioned below.

License NumberSpecializationStateStatus
2402Clinical Psychology MassachusettsPrimary

Mailing Address

Business mailing address can be used for mailing purpose only, for visiting purpose patients need to refer above mentioned Practice address.

Dr. William Douglas Gammon
572 Boston Rd, Suite 14
Billerica, MA - 01821
Phone: 781-696-2070
Fax: 978-294-8977

Book an Appointment with Dr. William Douglas Gammon

To schedule an appointment, contact Dr. William Douglas Gammon at 572 Boston Rd, Suite 14, Billerica, Massachusetts or call the phone number listed below.

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Frequently Asked Questions

Below are some commonly asked questions about Dr. William Douglas Gammon:

Dr. William Douglas Gammon is a psychologist specializing in Clinical Psychology. He is a mental health professional with highly specialized training in the diagnosis and psychological treatment of mental, behavioral and emotional illnesses, including obsessive-compulsive disorder (OCD). His main focus is on diagnosing and treating mental, emotional, and behavioral disorders. Some of the common disorders that he can treat are learning disabilities, substance abuse, depression, anxiety, and eating disorders.

Dr. William Douglas Gammon has approximately 48 years of experience in Clinical Psychology.

Yes, Dr. William Douglas Gammon accepts Medicare assignment, meaning the provider participates in Medicare and accepts Medicare-approved amounts for eligible services.

Yes, Dr. William Douglas Gammon is currently accepting new patients. To schedule an appointment, contact the office directly and schedule an appointment.
*Availability may change. Please contact the office directly to ask about appointments.

Dr. William Douglas Gammon practices at 572 Boston Rd, Suite 14, Billerica, Massachusetts, 01821-3776.

To schedule an appointment with Dr. William Douglas Gammon, please contact the office at 781-696-2070.

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**Data of this site is collected from Medicare & Medicaid Services (CMS) and NPPES. Last updated on 14 September, 2026.