Joseph Guadalupe Marquez, D.O.
Child & Adolescent Psychiatry Physician · Downey, CA
Joseph Guadalupe Marquez, D.O. is a child & adolescent psychiatry physician with a practice address in Downey, California, and NPI 1902989528, issued on Oct 24, 2006. Check the license (California 20A8470, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Joseph Guadalupe Marquez
- Credential
- D.O.
- Primary taxonomy
- Child & Adolescent Psychiatry Physician 2084P0804X
- License number
- 20A8470 CA
Self-reported in NPPES; status is on the state search - Practice location
- 7285 Quill Dr, Downey, CA 90242
- Phone
- (562) 940-6077
- Enumerated
- Oct 24, 2006
- Record last updated
- Jan 31, 2011 (not updated in 15 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest child & adolescent psychiatry physician records → All 1,009 in California → Look up another NPI →
Also registered at 7285 Quill Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Katherine Aculco, PTLicensed Psychiatric Technician1609945310
- Brian Adair, LCSWClinical Social Worker1922196583
- Paul Ascarate, PH.D.Clinical Psychologist1073694188
- Song Ashikawa, MSW, LCSWClinical Social Worker1770664393
- Katherinne Aucaruri RodriguezClinical Social Worker1871044297
- Marcela AyalaClinical Social Worker1124212766
Verify Joseph Guadalupe Marquez in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A8470Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Industry payments in 2024: $28.52
1 payment: food and beverage; the largest payer was Alkermes, Inc. The 1,578 providers of this specialty with any payment received $1,427.96 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Joseph Guadalupe Marquez among 1,009 child & adolescent psychiatry physician records in California
Joseph Guadalupe Marquez, D.O. is one of 1,009 child & adolescent psychiatry physician records with a practice address in California. 55% 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 3% of them.
- NPI issued2006 · 3% of these records are older, 65% newer
- In a Medicare fileYes · 55% of these records are
- In the CMS Doctors and Clinicians fileNo · 21% of these records are
- Record last updated2011 · 57% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2084P0804X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Child & Adolescent Psychiatry Physician providers in California
There are 1,009 child & adolescent psychiatry physician records in California.
All 1,009 in California → Every provider in Downey → Child & Adolescent Psychiatry Physician nationwide →
The 8 child & adolescent psychiatry physician records with the nearest ZIP codes
- Duong Ho-Hoang, D.O., M.ED.Downey, CA 902421922364009
- Elias Rodriguez, MEDICAL DOCTORDowney, CA 902421972684744
- Wagdan Magharious, M.D.Downey, CA 902411578510228
- Adeshewa Adekunbi, MDGardena, CA 902481083134829
- Dawn Brown, M.D.Gardena, CA 902481740481118
- Ronald St. Hill, MDGardena, CA 902481316032147
- Vashaun Williams, M.D.Gardena, CA 902481730286527
- Hadijat Audu, MDHuntington Park, CA 902551013544790
Common questions
What is Joseph Guadalupe Marquez, D.O.'s NPI number?
Joseph Guadalupe Marquez, D.O.'s National Provider Identifier (NPI) is 1902989528, issued on Oct 24, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Joseph Guadalupe Marquez, D.O. located?
The NPPES record lists a practice address at 7285 Quill Dr, Downey, CA, 90242. Phone: (562) 940-6077. Providers update this record themselves, so call before visiting.
How can I verify Joseph Guadalupe Marquez, D.O.'s license?
NPPES lists California license number 20A8470, 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.
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.