JAMES ANDREW WILLIAMS MD
NPI 1083355879
Emergency Medicine in Stockton, CA
About James Andrew Williams Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
JAMES ANDREW WILLIAMS MD (NPI 1083355879) is an individual emergency medicine provider in Stockton, California, licensed in California (A198652) and active in the NPI registry since April 2022. He is enrolled in Medicare PECOS, is affiliated with John T Mather Memorial Hospital Of Port Jefferson, and maintains 3 additional practice locations.
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Locations 3
Accepted Insurance
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
James Andrew Williams Md 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
7Medicare enrollment records show James Williams reassigns Medicare billing to 7 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Merced, CA 95340
- Reassigned Medicare billing, California enrollment
- 141 clinicians in this Medicare group
Delano, CA 93215
- Reassigned Medicare billing, California enrollment
- 301 clinicians in this Medicare group
Great Neck, NY 11021
- Reassigned Medicare billing, New York enrollment
- 9,353 clinicians in this Medicare group
Waterbury, CT 06708
- Reassigned Medicare billing, Connecticut enrollment
- 125 clinicians in this Medicare group
Port Jefferson, NY 11777
- Reassigned Medicare billing, New York enrollment
- 255 clinicians in this Medicare group
North Providence, RI 02904
- Reassigned Medicare billing, Rhode Island enrollment
- 83 clinicians in this Medicare group
Wakefield, RI 02879
- Reassigned Medicare billing, Rhode Island enrollment
- 67 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.
Hospital Affiliations CMS Care Compare 4
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
John T Mather Memorial Hospital Of Port Jefferson
Acute Care Hospitals · Port Jefferson, NYRoger Williams Medical Center
Acute Care Hospitals · Providence, RIOur Lady Of Fatima Hospital
Acute Care Hospitals · North Providence, RISouth County Hospital Inc
Acute Care Hospitals · Wakefield, RIPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 95204 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
STOCKTON, CA 95204
STOCKTON, CA 95204
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 James Williams's NPI number?
The NPI number for James Williams is 1083355879. It was assigned to this individual provider in the NPPES registry on April 5, 2022.
Where is James Williams located?
James Williams practices at 1800 N California St, Stockton, CA 95204. The listed phone number is (209) 547-7146.
What is James Williams's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is James Williams enrolled in Medicare?
Yes. James Williams 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 James Williams's services?
According to the CMS Revalidation Reassignment List (October 2026 release), James Williams reassigns Medicare benefits to 7 organizations: San Joaquin Emergency Medical Associates (Merced, CA), Team Physicians Of California Medical Group Inc (Delano, CA), North Shore-Lij Medical PC (Great Neck, NY), Emergency Physicians Of Connecticut PC (Waterbury, CT), John T. Mather Memorial Hospital (Port Jefferson, NY) and 2 more organizations, listed in the Medicare section above. 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 James Williams's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does James Williams accept?
Health plans from WellSense Health Plan list James Williams as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is James Williams affiliated with any hospitals?
According to CMS data, James Williams is affiliated with John T Mather Memorial Hospital Of Port Jefferson, Roger Williams Medical Center, Our Lady Of Fatima Hospital and South County Hospital Inc.
When was this NPI record last updated?
The NPPES record for James Williams was last updated on November 13, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 months 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.
# James Andrew Williams, MD · NPI 1083355879
Emergency Medicine physician in Stockton, California. Individual provider, active in the CMS NPPES registry since April 5, 2022.
## Identity
- **NPI:** 1083355879 (Entity type: Individual)
- **Enumerated:** April 5, 2022
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** A198652 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 1800 N CALIFORNIA ST, Stockton, CA 95204-6019
- **Phone:** (209) 547-7146
## 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:** 7 organizations under Medicare reassignment (form CMS-855R): San Joaquin Emergency Medical Associates (NPI 1588960413, Merced, CA); Team Physicians Of California Medical Group Inc (NPI 1447288345, Delano, CA); North Shore-Lij Medical PC (NPI 1053688572, Great Neck, NY); Emergency Physicians Of Connecticut PC (NPI 1902278906, Waterbury, CT); John T. Mather Memorial Hospital (NPI 1467249334, Port Jefferson, NY); and 2 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2021
## Record status
- **NPPES last updated:** November 13, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1083355879) · Data from the CMS NPPES public registry.