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

Dr. William S. Clark, DO

Individual provider Emergency Medicine Physician · NPI 1770690430

Dr. William S. Clark, DO practises Emergency Medicine in Escalon, California. Graduated from Chicago College of Osteopathy in 2000, 26 years ago. Practices with Cep America - California, a 1,267-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in California and Indiana.

Years since qualifying
26
Trained at
Chicago College of Osteopathy
Licensed in
CA, IN
In the registry since
2006
Specialties on file
4
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

1631 4th St
Escalon, CA 95320-2007
Phone: (209) 838-3434
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 1235 McHenry Ave, Modesto, CA 95350-5370 — (818) 398-8527

Specialties & licences

Emergency Medicine Physician (primary) Taxonomy 207P00000X · Licence 20A8748 (CA)
Emergency Medicine Physician Taxonomy 207P00000X · Licence 02002521A (IN)
Addiction (Substance Use Disorder) Counselor Taxonomy 101YA0400X · Licence 20A8748 (CA)
General Practice Physician Taxonomy 208D00000X · Licence 20A8748 (CA)

Record details

NPI number1770690430
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorNo
NPI enumeratedAugust 25, 2006
Last updated in NPPESMay 12, 2022
Certification dateMay 12, 2022

Medicare enrollment

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

Medicare specialtyEMERGENCY MEDICINE
Medical schoolCHICAGO COLLEGE OF OSTEOPATHY
Graduated 2000 (26 years in practice)
Group practice Cep America - California — 1267 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 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 patients559
Services billed 1,105 a service is one billed item, such as a visit, a test or a procedure
Average patient age75

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 Cep America - California

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 1267 clinicians in the practice; 12 are shown here.