Psychologist | Clinical Child & Adolescent Psychology | 35+ years experience

Dr. Paul John Callahan, PSY.D.

2557 Massachusetts Ave, Cambridge, Massachusetts, 02140-1020

About Dr. Paul John Callahan

Dr. Paul John Callahan is a psychologist based in Cambridge, Massachusetts with 35 years of experience in Clinical Child & Adolescent Psychology. He completed his graduation in 1991. 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. Paul John Callahan is 6376 for Clinical Child & Adolescent Psychology in Massachusetts. His current practice location is 2557 Massachusetts Ave, Cambridge. Patients can contact him at 781-643-1020. Dr. Paul John Callahan, PSY.D., specializes in Clinical Child & Adolescent Psychology and his NPI number (Unique professional ID assigned by NPPES) is 1114062239.

Dr. Paul John Callahan analyse the cognitive, social and emotional development of children. Typically, he look at development from the prenatal period through adolescence. Some of the traditional areas of interest include genetics, language development, learning disabilities, personality, gender roles, cognitive development, sexual development and social growth.
Clinical Child Psychologist responsibilities includes task like assessing and treating learning or developmental disabilities or delays; Working with children and their caregivers to manage behavioral issues; Administering psychological tests; Conducting scientific research on childhood development; Working with a health care team to create a unique treatment plan for a client.

Practice Information

Dr. Paul John Callahan'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. Paul John Callahan
Specialization Clinical Child & Adolescent Psychology
Credentials PSY.D.
Accepts Medicare Assignment Yes
Experience 35+ years
Graduation Year 1991
Gender Male
Practice Address: 2557 Massachusetts Ave,
Cambridge, MA - 02140-1020

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 6103986385
Enrollment ID I20081120000901
NPI Number1114062239
NPI Enumeration Date: 20 Feb, 2007
NPI Last Update On: 08 Jul, 2007

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. Paul John Callahan are as mentioned below.

License NumberSpecializationStateStatus
6376Clinical Child & Adolescent Psychology MassachusettsPrimary

Group Practice

Group practices are practice of medicine by a group of healthcare professionals who share their premises and other resources. Following list states all the group name with which Dr. Paul John Callahan is associated with along with the number of members in that group.
Organization Name (Group PAC ID) Members
Child And Family Psychological Services Pllc (5991763823)173

Other Medical Identifiers

Other professional identifiers associated with Dr. Paul John Callahan such as Medicaid, Medicare PIN, NSC, UPIN etc. are mentioned as below.
IdentifierTypeStateIssuer
W05323OtherMassachusettsBCBS ID #

Mailing Address

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

Dr. Paul John Callahan
26 Stevens Ter,
Arlington, MA - 02476-7720
Phone: 781-643-1531

Book an Appointment with Dr. Paul John Callahan

To schedule an appointment, contact Dr. Paul John Callahan at 2557 Massachusetts Ave, Cambridge, Massachusetts or call the phone number listed below.

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Frequently Asked Questions

Below are some commonly asked questions about Dr. Paul John Callahan:

Dr. Paul John Callahan is a psychologist specializing in Clinical Child & Adolescent Psychology. He analyse the cognitive, social and emotional development of children. Typically, he look at development from the prenatal period through adolescence. Some of the traditional areas of interest include genetics, language development, learning disabilities, personality, gender roles, cognitive development, sexual development and social growth.
Clinical Child Psychologist responsibilities includes task like assessing and treating learning or developmental disabilities or delays; Working with children and their caregivers to manage behavioral issues; Administering psychological tests; Conducting scientific research on childhood development; Working with a health care team to create a unique treatment plan for a client.

Dr. Paul John Callahan has approximately 35 years of experience in Clinical Child & Adolescent Psychology.

Yes, Dr. Paul John Callahan accepts Medicare assignment, meaning the provider participates in Medicare and accepts Medicare-approved amounts for eligible services.

Yes, Dr. Paul John Callahan 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. Paul John Callahan practices at 2557 Massachusetts Ave, Cambridge, Massachusetts, 02140-1020.

To schedule an appointment with Dr. Paul John Callahan, please contact the office at 781-643-1020.

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