Martha Sue Klassen, PSYD, BCBA
Clinical Psychologist · Los Alamitos, CA
Martha Sue Klassen, PSYD, BCBA is a clinical psychologist with a practice address in Los Alamitos, California, and NPI 1700135548, issued on Sep 7, 2012. Check the license (California PSY29865, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Martha Sue Klassen
- Credential
- PSYD, BCBA
- Primary taxonomy
- Clinical Psychologist 103TC0700X
- License number
- PSY29865 CA
Self-reported in NPPES; status is on the state search - Practice location
- 5212 Katella Ave Ste 104, Los Alamitos, CA 90720
- Phone
- (714) 490-3428
- Enumerated
- Sep 7, 2012
- Record last updated
- Mar 21, 2025
- Fax
- (562) 493-1684
- Medicare enrollment
- Enrolled (PECOS I20181109001089); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest clinical psychologist records → All 12,647 in California → Look up another NPI →
Also registered at 5212 Katella Ave Ste 104
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Victor Buechler, M.S.Marriage & Family Therapist1639213317
- Joshua Garth, LMFTMarriage & Family Therapist1457173700
- Jennifer Rozdal, LICENSED MFTMarriage & Family Therapist1346370830
Verify Martha Sue Klassen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license PSY29865Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Bills Medicare through one group practice
- Jodie Knott, Phd Psychological Consulting, IncLos Alamitos, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Martha Sue Klassen among 12,647 clinical psychologist records in California
Martha Sue Klassen, PSYD, BCBA is one of 12,647 clinical psychologist records with a practice address in California. 9% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2012, is newer than 63% of them.
- NPI issued2012 · 63% of these records are older, 33% newer
- In a Medicare fileYes · 9% of these records are
- In the CMS Doctors and Clinicians fileYes · 19% of these records are
- Graduated2010 · median 2006 among the 2,424 with a school on file
- Record last updated2025 · 63% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 103TC0700X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
21 clinical psychologist records list a practice address in Los Alamitos
They are 21 of the 1,035 NPPES records with a practice address in Los Alamitos, and 12,647 clinical psychologist records in California.
All 12,647 in California → Every provider in Los Alamitos → Clinical Psychologist nationwide →
The 8 clinical psychologist records with the nearest ZIP codes
- Lawrence Blum, PHDLos Alamitos, CA 907201427066372
- Laura Caghan, PSYDLos Alamitos, CA 907201538222542
- Samantha Case, PSY.D.Los Alamitos, CA 907201366605685
- Janis Foote, PH.D.Los Alamitos, CA 907201689726747
- Monica Hodges, PH.D.Los Alamitos, CA 907201942445135
- Roxana Lambdin, PH.D.Los Alamitos, CA 907201326094442
- Christie Morehead, PSY.D.Los Alamitos, CA 907201841390788
- Bernard Natelson, PSY.D.Los Alamitos, CA 907201063433183
Common questions
What is Martha Sue Klassen, PSYD, BCBA's NPI number?
Martha Sue Klassen, PSYD, BCBA's National Provider Identifier (NPI) is 1700135548, issued on Sep 7, 2012. An NPI identifies a provider in billing; it is not a license.
Where is Martha Sue Klassen, PSYD, BCBA located?
The NPPES record lists a practice address at 5212 Katella Ave Ste 104, Los Alamitos, CA, 90720. Phone: (714) 490-3428. Providers update this record themselves, so call before visiting.
How can I verify Martha Sue Klassen, PSYD, BCBA's license?
NPPES lists California license number PSY29865, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.