Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
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Dr. Maria Isabel Holtrop, PSYD

Individual provider Clinical Psychologist · NPI 1316170004

Dr. Maria Isabel Holtrop, PSYD is a Clinical Psychologist in Lancaster, California. Qualified in 2008, 18 years ago. Practices as a sole proprietor and accepts Medicare assignment. Licensed in California.

Years since qualifying
18
Licensed in
CA
In the registry since
2009
What do these letters mean?
PSYD — Doctor of Psychology
A doctoral psychologist trained primarily for clinical practice.

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Practice location Address checks out

1672 W Avenue J Ste 207
Lancaster, CA 93534-2861
Phone: (661) 225-7166
Fax: (661) 943-3871
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Clinical Psychologist (primary) Taxonomy 103TC0700X · Licence PSY 22962 (CA)

Record details

NPI number1316170004
Entity typeIndividual (Type 1)
GenderFemale
Credentials PSYD
Sole proprietorYes
NPI enumeratedAugust 27, 2009
Last updated in NPPESAugust 27, 2009

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyCLINICAL PSYCHOLOGIST
Medical schoolOTHER
Graduated 2008 (18 years in practice)
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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