Deron Theodore Warren, D.O.
Emergency Medicine Physician · Mariposa, CA
Deron Theodore Warren, D.O. is an emergency medicine physician with a practice address in Mariposa, California, and NPI 1962491670, issued on Oct 14, 2005. Check the license (California 20A10992, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Deron Theodore Warren
- Credential
- D.O.
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- 20A10992 CA
Self-reported in NPPES; status is on the state search - Practice location
- 5189 Hospital RD, Mariposa, CA 95338
- Phone
- (209) 966-3631
- Enumerated
- Oct 14, 2005
- Record last updated
- Dec 14, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20151112001812); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 7,751 in California → Look up another NPI →
Also registered at 5189 Hospital RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Kristen Fournier, FNPFamily Nurse Practitioner1023983830
- Leena Gupta, MDInternal Medicine Physician1811901580
- Robert Horvat, MD, PHDEndocrinology, Diabetes & Metabolism Physician1841279668
- Betty Massey, LCSWClinical Social Worker1457384323
- Joseph Rogers, MDEmergency Medicine Physician1033133202
Verify Deron Theodore Warren in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A10992Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
66% fewer Medicare Part D claims than the average emergency medicine physician in 2024
77 Medicare Part D claims for 57 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D.
Most prescribed
- Prednisone12 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 61.1 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Bills Medicare through 2 group practices
- Carbon Health Medical Group OF California PCSan Francisco, CA
- Pacific Redwood Medical Group IncWillits, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Deron Theodore Warren among 7,751 emergency medicine physician records in California
Deron Theodore Warren, D.O. is one of 7,751 emergency medicine physician records with a practice address in California. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 96% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 59% of these records are
- Graduated2003 · median 2011 among the 4,560 with a school on file
- Record last updated2021 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207P00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
2 emergency medicine physician records list a practice address in Mariposa
They are 2 of the 237 NPPES records with a practice address in Mariposa, and 7,751 emergency medicine physician records in California.
All 7,751 in California → Every provider in Mariposa → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Joseph Rogers, MDMariposa, CA 953381033133202
- Victor Alexander, MDManteca, CA 953371871671156
- Yasmin Emery, MDManteca, CA 953371285712091
- Kanwal Gill, MDManteca, CA 953371134207954
- Paulette Gori, MDManteca, CA 953371710065396
- Andrew Jaramillo, MDManteca, CA 953371851479661
- Sophie Kay, D.OManteca, CA 953371578731261
- Andrew Melendez, DOManteca, CA 953371104403252
Common questions
What is Deron Theodore Warren, D.O.'s NPI number?
Deron Theodore Warren, D.O.'s National Provider Identifier (NPI) is 1962491670, issued on Oct 14, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Deron Theodore Warren, D.O. located?
The NPPES record lists a practice address at 5189 Hospital RD, Mariposa, CA, 95338. Phone: (209) 966-3631. Providers update this record themselves, so call before visiting.
How can I verify Deron Theodore Warren, D.O.'s license?
NPPES lists California license number 20A10992, 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 Deron Theodore Warren, D.O. prescribe under Medicare Part D?
In 2024, Deron Theodore Warren, D.O. had 77 Medicare Part D claims for 57 beneficiaries; the average among emergency medicine physician prescribers was 226. Part D covers Medicare prescriptions only.
What is Deron Theodore Warren, D.O.'s MIPS final score?
The 2023 MIPS final score is 61.1 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.