James Stephen Maurer, M.D.
Psychiatry Physician · Patton, CA
James Stephen Maurer, M.D. is a psychiatry physician with a practice address in Patton, California, and NPI 1659323392, issued on May 17, 2006. Check the license (California G75446, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- James Stephen Maurer
- Credential
- M.D.
- Primary taxonomy
- Psychiatry Physician 2084P0800X
- License number
- G75446 CA
Self-reported in NPPES; status is on the state search - Practice location
- 3102 E. Highland Avenue, Patton, CA 92369
- Phone
- (909) 425-7679
- Enumerated
- May 17, 2006
- Record last updated
- Nov 26, 2018 (not updated in 8 years: call before relying on the address or phone)
- Fax
- (909) 425-6635
- Medicare enrollment
- Enrolled (PECOS I20040412000618); accepts Medicare assignment
- Medical or professional school
- Loma Linda University School Of Medicine, 1991
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest psychiatry physician records → All 8,673 in California → Look up another NPI →
Also registered at 3102 E. Highland Avenue
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Tim Alder, M.D.Psychiatry Physician1619929023
- Luminita Andronescu, M.D.Specialist1699856864
- Ai Li Arias, M.D.Psychiatry Physician1134171598
- Maurizio Assandri, PH.D.Psychologist1790807402
- Jasdeep Aulakh, M.D.Geriatric Psychiatry Physician1932153616
- Tamseela Awan, M.D.Internal Medicine Physician1720059413
Verify James Stephen Maurer in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G75446Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
91% fewer Medicare Part D claims than the average psychiatry physician in 2024
94 Medicare Part D claims for 15 beneficiaries, against an average of 1,000 among the 35,054 providers of this specialty who prescribed in Part D.
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- Faculty Physicians And Surgeons OF LlusmRedlands, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
James Stephen Maurer among 8,673 psychiatry physician records in California
James Stephen Maurer, M.D. is one of 8,673 psychiatry physician records with a practice address in California. 67% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 2% of them.
- NPI issued2006 · 2% of these records are older, 67% newer
- In a Medicare fileYes · 67% of these records are
- In the CMS Doctors and Clinicians fileYes · 38% of these records are
- Graduated1991 · median 2005 among the 3,295 with a school on file
- Record last updated2018 · 54% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2084P0800X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
79 psychiatry physician records list a practice address in Patton
They are 79 of the 339 NPPES records with a practice address in Patton, and 8,673 psychiatry physician records in California.
All 8,673 in California → Every provider in Patton → Psychiatry Physician nationwide →
The 8 psychiatry physician records with the nearest ZIP codes
- Tim Alder, M.D.Patton, CA 923691619929023
- Ai Li Arias, M.D.Patton, CA 923691134171598
- Roger Cabansag, M.D.Patton, CA 923691063464352
- Edward Case, MDPatton, CA 923691407808785
- Manuel Desagun, MDPatton, CA 923691518919802
- Ron Foo, MDPatton, CA 923691578515813
- Greta Herbes, M.D.Patton, CA 923691619929171
- Joshua Horsley, M.D.Patton, CA 923691316999733
Common questions
What is James Stephen Maurer, M.D.'s NPI number?
James Stephen Maurer, M.D.'s National Provider Identifier (NPI) is 1659323392, issued on May 17, 2006. An NPI identifies a provider in billing; it is not a license.
Where is James Stephen Maurer, M.D. located?
The NPPES record lists a practice address at 3102 E. Highland Avenue, Patton, CA, 92369. Phone: (909) 425-7679. Providers update this record themselves, so call before visiting.
How can I verify James Stephen Maurer, M.D.'s license?
NPPES lists California license number G75446, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does James Stephen Maurer, M.D. prescribe under Medicare Part D?
In 2024, James Stephen Maurer, M.D. had 94 Medicare Part D claims for 15 beneficiaries; the average among psychiatry physician prescribers was 1,000. Part D covers Medicare prescriptions 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.