Psychologist | Cognitive & Behavioral Psychology

Dr. Justin Collmann, PH.D.

435 Petaluma Ave, Suite 110e, Sebastopol, California, 95472-4277

About Dr. Justin Collmann

Dr. Justin Collmann is a psychologist based in Sebastopol, California who is specialized in Cognitive & Behavioral Psychology. Active license number of Dr. Justin Collmann is 27539 for Cognitive & Behavioral Psychology in California. His current practice location is 435 Petaluma Ave, Suite 110e, Sebastopol. Patients can contact him at 707-536-6956. Dr. Justin Collmann, PH.D., specializes in Cognitive & Behavioral Psychology and his NPI number (Unique professional ID assigned by NPPES) is 1386017754.

Dr. Justin Collmann has variety of professional responsibilities, including assessment (identifying, diagnosing, and conceptualizing problems experienced by individuals or groups), intervention (creating, implementing and evaluating interventions designed to induce positive change) and consultation. Cognitive Behavioral Psychologists also participates in research, education, training, and clinical practice including a range of issues and populations.

Practice Information

Dr. Justin Collmann'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. Justin Collmann
Specialization Cognitive & Behavioral Psychology
Credentials PH.D.
Gender Male
Practice Address: 435 Petaluma Ave, Suite 110e
Sebastopol, CA - 95472-4277

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.

NPI Number1386017754
NPI Enumeration Date: 07 Nov, 2015
NPI Last Update On: 07 Nov, 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. Justin Collmann are as mentioned below.

License NumberSpecializationStateStatus
27539Cognitive & Behavioral Psychology CaliforniaPrimary

Mailing Address

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

Dr. Justin Collmann
1152 Prunetree Ct,
Santa Rosa, CA - 95401-4984
Phone: 707-536-6956

Book an Appointment with Dr. Justin Collmann

To schedule an appointment, contact Dr. Justin Collmann at 435 Petaluma Ave, Suite 110e, Sebastopol, California or call the phone number listed below.

Book an Appointment

Frequently Asked Questions

Below are some commonly asked questions about Dr. Justin Collmann:

Dr. Justin Collmann is a psychologist specializing in Cognitive & Behavioral Psychology. He has variety of professional responsibilities, including assessment (identifying, diagnosing, and conceptualizing problems experienced by individuals or groups), intervention (creating, implementing and evaluating interventions designed to induce positive change) and consultation. Cognitive Behavioral Psychologists also participates in research, education, training, and clinical practice including a range of issues and populations.

Yes, Dr. Justin Collmann 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. Justin Collmann practices at 435 Petaluma Ave, Suite 110e, Sebastopol, California, 95472-4277.

To schedule an appointment with Dr. Justin Collmann, please contact the office at 707-536-6956.

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