Psychologist | Clinical Psychology

Caitlin O'brien-masonis, PSY.D

10333 El Camino Real, Atascadero, California, 93422-5808

About Caitlin O'brien-masonis

Caitlin O'brien-masonis is a psychologist based in Atascadero, California who is specialized in Clinical Psychology. Active license number of Caitlin O'brien-masonis is PSY35616 for Clinical Psychology in California. Her current practice location is 10333 El Camino Real, Atascadero. Patients can contact her at 805-468-2000. Caitlin O'brien-masonis, PSY.D, specializes in Clinical Psychology and her NPI number (Unique professional ID assigned by NPPES) is 1508679846.

Caitlin O'brien-masonis 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). Her main focus is on diagnosing and treating mental, emotional, and behavioral disorders. Some of the common disorders that she can treat are learning disabilities, substance abuse, depression, anxiety, and eating disorders.

Practice Information

Caitlin O'brien-masonis'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 Caitlin O'brien-masonis
Specialization Clinical Psychology
Credentials PSY.D
Gender Female
Practice Address: 10333 El Camino Real,
Atascadero, CA - 93422-5808

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 Number1508679846
NPI Enumeration Date: 30 Jan, 2025
NPI Last Update On: 05 Feb, 2025

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 Caitlin O'brien-masonis are as mentioned below.

License NumberSpecializationStateStatus
PSY35616Clinical 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.

Caitlin O'brien-masonis
Po Box 2377,
Atascadero, CA - 93423-2377
Phone: 301-742-2910

Book an Appointment with Caitlin O'brien-masonis

To schedule an appointment, contact Caitlin O'brien-masonis at 10333 El Camino Real, Atascadero, California or call the phone number listed below.

Book an Appointment

Frequently Asked Questions

Below are some commonly asked questions about Caitlin O'brien-masonis:

Caitlin O'brien-masonis is a psychologist specializing in Clinical Psychology. She 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). Her main focus is on diagnosing and treating mental, emotional, and behavioral disorders. Some of the common disorders that she can treat are learning disabilities, substance abuse, depression, anxiety, and eating disorders.

Yes, Caitlin O'brien-masonis 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.

Caitlin O'brien-masonis practices at 10333 El Camino Real, Atascadero, California, 93422-5808.

To schedule an appointment with Caitlin O'brien-masonis, please contact the office at 805-468-2000.

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