DR. WILLIAM S. CLARK DO
NPI 1770690430
Emergency Medicine in Escalon, CA
About Dr. William S. Clark Do NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. WILLIAM S. CLARK DO (NPI 1770690430) is an individual emergency medicine provider in Escalon, California, licensed in California (20A8748) and active in the NPI registry since August 2006. He is enrolled in Medicare PECOS, maintains a secondary practice location in Modesto, and is a graduate of Chicago College Of Osteopathy (2000).
NPPES Registry Identity
Specialties & Licenses 3
Secondary Practice Location 1
Other Identifiers 1
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Dr. William S. Clark Do is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
4Medicare enrollment records show William Clark reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Modesto, CA 95355
- Reassigned Medicare billing, California enrollment
- 2,323 clinicians in this Medicare group
Mariposa, CA 95338
- Reassigned Medicare billing, California enrollment
- 28 clinicians in this Medicare group
Delano, CA 93215
- Reassigned Medicare billing, California enrollment
- 301 clinicians in this Medicare group
Blythe, CA 92225
- Reassigned Medicare billing, California enrollment
- 50 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 6
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 95320 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is William Clark's NPI number?
The NPI number for William Clark is 1770690430. It was assigned to this individual provider in the NPPES registry on August 25, 2006.
Where is William Clark located?
William Clark practices at 1631 4th St, Escalon, CA 95320. The listed phone number is (209) 838-3434.
What is William Clark's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is William Clark enrolled in Medicare?
Yes. William Clark is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for William Clark's services?
According to the CMS Revalidation Reassignment List (October 2026 release), William Clark reassigns Medicare benefits to 4 organizations: Cep America - California (Modesto, CA), Erx Plus Professional Corporation (Mariposa, CA), Team Physicians Of California Medical Group Inc (Delano, CA) and Premier Health Partners (Blythe, CA). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for William Clark's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for William Clark was last updated on May 12, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Dr. William S. Clark, DO · NPI 1770690430
Emergency Medicine physician in Escalon, California. Individual provider, active in the CMS NPPES registry since August 25, 2006.
## Identity
- **NPI:** 1770690430 (Entity type: Individual)
- **Enumerated:** August 25, 2006
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** 20A8748 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 1631 4TH ST, Escalon, CA 95320-2007
- **Phone:** (209) 838-3434
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 4 organizations under Medicare reassignment (form CMS-855R): Cep America - California (NPI 1396044491, Modesto, CA); Erx Plus Professional Corporation (NPI 1336508407, Mariposa, CA); Team Physicians Of California Medical Group Inc (NPI 1447288345, Delano, CA); Premier Health Partners (NPI 1609170232, Blythe, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Chicago College Of Osteopathy, class of 2000
## Record status
- **NPPES last updated:** May 12, 2022
- **Other identifiers:** Medicaid 00AX87480 (CA)
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Source: [NPI Profile](https://npiprofile.com/npi/1770690430) · Data from the CMS NPPES public registry.