Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Dr. Deron Theodore Warren, DO

Individual provider Emergency Medicine Physician · NPI 1962491670

Dr. Deron Theodore Warren, DO practises Emergency Medicine in Mariposa, California. Qualified in 2003, 23 years ago. Practices with Pacific Redwood Medical Group Inc, a 59-clinician group and accepts Medicare assignment. Licensed in California.

Years since qualifying
23
Licensed in
CA
In the registry since
2005
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

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Practice location Address checks out

5189 Hospital Rd
Mariposa, CA 95338-9524
Phone: (209) 966-3631
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Emergency Medicine Physician (primary) Taxonomy 207P00000X · Licence 20A10992 (CA)

Record details

NPI number1962491670
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorNo
NPI enumeratedOctober 14, 2005
Last updated in NPPESDecember 14, 2021
Certification dateDecember 14, 2021

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyEMERGENCY MEDICINE
Medical schoolOTHER
Graduated 2003 (23 years in practice)
Group practice Pacific Redwood Medical Group Inc — 59 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations3 on file with Medicare

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients79
Services billed 106 a service is one billed item, such as a visit, a test or a procedure
Average patient age77

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at Pacific Redwood Medical Group Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 59 clinicians in the practice; 12 are shown here.

Other providers in Mariposa