Karen Theresia Marcus, M.D.
Psychiatry Physician · Pittsburg, CA
Karen Theresia Marcus, M.D. is a psychiatry physician with a practice address in Pittsburg, California, and NPI 1003043993, issued on Jun 17, 2009. Check the license (California A108365, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Karen Theresia Marcus
- Credential
- M.D.
- Primary taxonomy
- Psychiatry Physician 2084P0800X
- License number
- A108365 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2311 Loveridge RD, Pittsburg, CA 94565
- Phone
- (925) 431-2600
- Enumerated
- Jun 17, 2009
- Record last updated
- Mar 20, 2012 (not updated in 14 years: call before relying on the address or phone)
- Fax
- (925) 431-2665
- Medicare enrollment
- Enrolled (PECOS I20111101000690); accepts Medicare assignment
- Medical or professional school
- University Of California, San Diego School Of Medicine, 2007
- Entity
- Type 1 · individual
8 nearest psychiatry physician records → All 8,673 in California → Look up another NPI →
Also registered at 2311 Loveridge RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Aileen Ambrosio, RNRegistered Nurse1376887968
- Sarabjot AzodePsychiatric/Mental Health Registered Nurse1285494823
- Sakura Barrientos, RNAdult Psychiatric/Mental Health Registered Nurse1871958645
- Christine BrightonOccupational Therapist1144555749
- Mayra Carrillo, MDFamily Medicine Physician1407372170
- Cheyenne Carson-CraftClinical Social Worker1700319225
Verify Karen Theresia Marcus in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A108365Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
76% fewer Medicare Part D claims than the average psychiatry physician in 2024
240 Medicare Part D claims for 55 beneficiaries, against an average of 1,000 among the 35,054 providers of this specialty who prescribed in Part D.
Most prescribed
- Metformin Hcl15 claims
- Trazodone Hcl13 claims
- Aripiprazole12 claims
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
- Bay Psychiatric AssociatesBerkeley, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Karen Theresia Marcus among 8,673 psychiatry physician records in California
Karen Theresia Marcus, 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 2009, is newer than 57% of them.
- NPI issued2009 · 57% of these records are older, 40% newer
- In a Medicare fileYes · 67% of these records are
- In the CMS Doctors and Clinicians fileYes · 38% of these records are
- Graduated2007 · median 2005 among the 3,295 with a school on file
- Record last updated2012 · 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).
11 psychiatry physician records list a practice address in Pittsburg
They are 11 of the 593 NPPES records with a practice address in Pittsburg, and 8,673 psychiatry physician records in California.
All 8,673 in California → Every provider in Pittsburg → Psychiatry Physician nationwide →
The 8 psychiatry physician records with the nearest ZIP codes
- Hala Fattah, MDPittsburg, CA 945651669510848
- Uzma Khan, M.DPittsburg, CA 945651053517490
- Tina Le, M.D.Pittsburg, CA 945651902936768
- Michael Levin, MDPittsburg, CA 945651427139591
- Matthew Littlefield, M.D.Pittsburg, CA 945651861640146
- Sandhya Nair, M.DPittsburg, CA 945651609065432
- Roobal Sekhon, D.O.Pittsburg, CA 945651427261528
- Robert Streett, MDPittsburg, CA 945651790863892
Common questions
What is Karen Theresia Marcus, M.D.'s NPI number?
Karen Theresia Marcus, M.D.'s National Provider Identifier (NPI) is 1003043993, issued on Jun 17, 2009. An NPI identifies a provider in billing; it is not a license.
Where is Karen Theresia Marcus, M.D. located?
The NPPES record lists a practice address at 2311 Loveridge RD, Pittsburg, CA, 94565. Phone: (925) 431-2600. Providers update this record themselves, so call before visiting.
How can I verify Karen Theresia Marcus, M.D.'s license?
NPPES lists California license number A108365, 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 Karen Theresia Marcus, M.D. prescribe under Medicare Part D?
In 2024, Karen Theresia Marcus, M.D. had 240 Medicare Part D claims for 55 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.