Psychologist | 16+ years experience

Dr. Martha Sue Klassen, PSYD, BCBA

5212 Katella Ave Ste 104, Los Alamitos, California, 90720-6829

About Dr. Martha Sue Klassen

Dr. Martha Sue Klassen is a psychologist based in Los Alamitos, California with 16 years of experience in Psychology. She completed her graduation in 2010. She accepts the Medicare-approved amount. Patients will not be billed for any more than the Medicare deductible and coinsurance. Active license number of Dr. Martha Sue Klassen is PSY29865 for Clinical Psychology in California. Her current practice location is 5212 Katella Ave Ste 104, Los Alamitos. Patients can contact her at 714-490-3428 or can fax her at 562-493-1684. Dr. Martha Sue Klassen, PSYD, BCBA, specializes in Psychology and her NPI number (Unique professional ID assigned by NPPES) is 1700135548.

Dr. Martha Sue Klassen 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. Martha Sue Klassen'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. Martha Sue Klassen
Specialization Psychology
Credentials PSYD, BCBA
Accepts Medicare Assignment Yes
Experience 16+ years
Graduation Year 2010
Gender Female
Practice Address: 5212 Katella Ave Ste 104,
Los Alamitos, CA - 90720-6829
Fax 562-493-1684

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 7315202025
Enrollment ID I20181109001089
NPI Number1700135548
NPI Enumeration Date: 07 Sep, 2012
NPI Last Update On: 21 Mar, 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 Dr. Martha Sue Klassen are as mentioned below.

License NumberSpecializationStateStatus
PSY29865Clinical Psychology CaliforniaPrimary
Behavioral Analyst Secondary

Mailing Address

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

Dr. Martha Sue Klassen
5212 Katella Ave Ste 104,
Los Alamitos, CA - 90720-6829
Phone: 714-490-3428
Fax: 562-493-1684

Book an Appointment with Dr. Martha Sue Klassen

To schedule an appointment, contact Dr. Martha Sue Klassen at 5212 Katella Ave Ste 104, Los Alamitos, California or call the phone number listed below.

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Frequently Asked Questions

Below are some commonly asked questions about Dr. Martha Sue Klassen:

Dr. Martha Sue Klassen 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.

Dr. Martha Sue Klassen has approximately 16 years of experience in Clinical Psychology.

Yes, Dr. Martha Sue Klassen accepts Medicare assignment, meaning the provider participates in Medicare and accepts Medicare-approved amounts for eligible services.

Yes, Dr. Martha Sue Klassen 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. Martha Sue Klassen practices at 5212 Katella Ave Ste 104, Los Alamitos, California, 90720-6829.

To schedule an appointment with Dr. Martha Sue Klassen, please contact the office at 714-490-3428.

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