DR. SHARON WILLIAMS M.D.
NPI 1336119510
Pediatrics - Pediatric Critical Care Medicine in Oakland, CA
About Dr. Sharon Williams M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. SHARON WILLIAMS M.D. (NPI 1336119510) is an individual pediatric critical care medicine provider in Oakland, California, licensed in California (G061236) and active in the NPI registry since January 2006. She is enrolled in Medicare PECOS.
NPPES Registry Identity
Specialties & Licenses
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Dr. Sharon Williams M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignments
3Medicare enrollment records show Sharon Williams reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
San Francisco, CA 94143
- Reassigned Medicare billing, California enrollment
- 5,645 clinicians in this Medicare group
San Francisco, CA 94122
- Reassigned Medicare billing, California enrollment
- 5,544 clinicians in this Medicare group
San Francisco, CA 94143
- Reassigned Medicare billing, California enrollment
- 1,159 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.
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.
OAKLAND, CA 94609
OAKLAND, CA 94609
OAKLAND, CA 94609
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 Sharon Williams's NPI number?
The NPI number for Sharon Williams is 1336119510. It was assigned to this individual provider in the NPPES registry on January 23, 2006.
Where is Sharon Williams located?
Sharon Williams practices at 747 52nd St Children's Hosp And Research Ctr. At Oak., Picu, Oakland, CA 94609. The listed phone number is (510) 428-3710.
What is Sharon Williams's specialty?
The primary specialty registered for this NPI is Pediatrics, specializing in Pediatric Critical Care Medicine, with taxonomy code 2080P0203X.
Is Sharon Williams enrolled in Medicare?
Yes. Sharon Williams is registered in the Medicare PECOS enrollment system.
Which organizations bill Medicare for Sharon Williams's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Sharon Williams reassigns Medicare benefits to 3 organizations: University Of California San Francisco (San Francisco, CA), Ucsf Medical Group Business Services (San Francisco, CA) and Ucsf Pediatrics Associates (San Francisco, 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 Sharon Williams'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 Sharon Williams was last updated on July 8, 2007. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 19 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. Sharon Williams, M.D. · NPI 1336119510
Pediatric Critical Care Medicine physician in Oakland, California. Individual provider, active in the CMS NPPES registry since January 23, 2006.
## Identity
- **NPI:** 1336119510 (Entity type: Individual)
- **Enumerated:** January 23, 2006
- **Primary specialty:** Pediatrics - Pediatric Critical Care Medicine · taxonomy 2080P0203X
- **State license:** G061236 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 747 52ND ST, CHILDREN'S HOSP AND RESEARCH CTR. AT OAK., PICU, Oakland, CA 94609-1809
- **Phone:** (510) 428-3710
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 3 organizations under Medicare reassignment (form CMS-855R): University Of California San Francisco (NPI 1346329380, San Francisco, CA); Ucsf Medical Group Business Services (NPI 1477624104, San Francisco, CA); Ucsf Pediatrics Associates (NPI 1376614016, San Francisco, CA) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** July 8, 2007
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Source: [NPI Profile](https://npiprofile.com/npi/1336119510) · Data from the CMS NPPES public registry.