Psychologist | General Psychology

Dr. Mariela M. Costello, PSY.D.

919 Fremont Ave, Suite 202, Los Altos, California, 95020

About Dr. Mariela M. Costello

Dr. Mariela M. Costello is a psychologist based in Los Altos, California who is specialized in General Psychology. Active license number of Dr. Mariela M. Costello is PSY23277 for Clinical Psychology in California. Her current practice location is 919 Fremont Ave, Suite 202, Los Altos. Patients can contact her at 408-220-3268. Dr. Mariela M. Costello, PSY.D., specializes in General Psychology and her NPI number (Unique professional ID assigned by NPPES) is 1801145727.

Dr. Mariela M. Costello is specialized in psychological testing and evaluating or assessing patient's personal characteristics, such as intelligence, personality, abilities, interests, aptitudes, and neuropsychological functioning. Accordingly, she performs counseling, psychoanalysis, psychotherapy, hypnosis, biofeedback, and behavior analysis and therapy. She can diagnose and treat mental and emotional disorder or disability, alcoholism and substance abuse, disorders of habit or conduct, as well as of the psychological aspects of physical illness, accident, injury, or disability by psycheducational evaluation, therapy, remediation, and consultation.

Practice Information

Dr. Mariela M. Costello'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. Mariela M. Costello
Specialization General Psychology
Credentials PSY.D.
Gender Female
Practice Address: 919 Fremont Ave, Suite 202
Los Altos, CA - 95020

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 Number1801145727
NPI Enumeration Date: 06 Sep, 2012
NPI Last Update On: 02 Oct, 2018

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. Mariela M. Costello are as mentioned below.

License NumberSpecializationStateStatus
PSY23277Clinical Psychology CaliforniaPrimary
PSY23277General Psychology CaliforniaSecondary

Mailing Address

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

Dr. Mariela M. Costello
919 Fremont Ave, Suite 202
Los Altos, CA - 95020
Phone: 408-220-3268

Book an Appointment with Dr. Mariela M. Costello

To schedule an appointment, contact Dr. Mariela M. Costello at 919 Fremont Ave, Suite 202, Los Altos, California or call the phone number listed below.

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Frequently Asked Questions

Below are some commonly asked questions about Dr. Mariela M. Costello:

Dr. Mariela M. Costello 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, Dr. Mariela M. Costello 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. Mariela M. Costello practices at 919 Fremont Ave, Suite 202, Los Altos, California, 95020.

To schedule an appointment with Dr. Mariela M. Costello, please contact the office at 408-220-3268.

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