Maria Isabel Holtrop, PSYD
Clinical Psychologist · Lancaster, CA
Maria Isabel Holtrop, PSYD is a clinical psychologist with a practice address in Lancaster, California, and NPI 1316170004, issued on Aug 27, 2009. Check the license (California PSY 22962, as entered in NPPES) with the California board that licenses this profession; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- Maria Isabel Holtrop
- Credential
- PSYD
- Primary taxonomy
- Clinical Psychologist 103TC0700X
- License number
- PSY 22962 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1672 W Avenue J Ste 207, Lancaster, CA 93534
- Phone
- (661) 225-7166
- Enumerated
- Aug 27, 2009
- Record last updated
- Aug 27, 2009 (not updated in 17 years: call before relying on the address or phone)
- Fax
- (661) 943-3871
- Medicare enrollment
- Enrolled (PECOS I20170915000051); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest clinical psychologist records → All 12,647 in California → Look up another NPI →
Also registered at 1672 W Avenue J Ste 207
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Maria Isabel Holtrop in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license PSY 22962Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Maria Isabel Holtrop among 12,647 clinical psychologist records in California
Maria Isabel Holtrop, PSYD 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 not. Its NPI, issued in 2009, is newer than 49% of them.
- NPI issued2009 · 49% of these records are older, 46% newer
- In a Medicare fileNo · 9% of these records are
- In the CMS Doctors and Clinicians fileYes · 19% of these records are
- Graduated2008 · median 2006 among the 2,424 with a school on file
- Record last updated2009 · 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).
46 clinical psychologist records list a practice address in Lancaster
They are 46 of the 4,273 NPPES records with a practice address in Lancaster, and 12,647 clinical psychologist records in California. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 12,647 in California → Every provider in Lancaster → Clinical Psychologist nationwide →
The 8 clinical psychologist records with the nearest ZIP codes
- Sarah Barajas, MALancaster, CA 935341851034458
- Dianne Defreece, PSY.D.Lancaster, CA 935341255431821
- Rhonda Digiovanni, PSYD, LMFTLancaster, CA 935341831344720
- Roger Girion, PH.DLancaster, CA 935341386912806
- Arora Harper, PHDLancaster, CA 935341710529094
- Gunilla Karlsson, PH.D.Lancaster, CA 935341083647242
- Page Lewis, PHDLancaster, CA 935341871503250
- Jonathan Meyer, PH.D.Lancaster, CA 935341649344037
Common questions
What is Maria Isabel Holtrop, PSYD's NPI number?
Maria Isabel Holtrop, PSYD's National Provider Identifier (NPI) is 1316170004, issued on Aug 27, 2009. An NPI identifies a provider in billing; it is not a license.
Where is Maria Isabel Holtrop, PSYD located?
The NPPES record lists a practice address at 1672 W Avenue J Ste 207, Lancaster, CA, 93534. Phone: (661) 225-7166. Providers update this record themselves, so call before visiting.
How can I verify Maria Isabel Holtrop, PSYD's license?
NPPES lists California license number PSY 22962, 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. 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.