1. Home
  2. Directory
  3. California
  4. Sacramento
  5. Anesthesiology
  6. NPI Profile

WILLIAM CHARLES FOX MD
NPI 1629465638
Anesthesiology in Sacramento, CA

Active since April 17, 2015PECOS EnrolledAccepts Medicare Assignment
3315 WATT AVE, SACRAMENTO, CA 95821(916) 481-6800(916) 481-1881 Get Directions Write a Review

NPPES record last updated: January 15, 2026. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Jan 15, 2026, Jul 9, 2024, Nov 10, 2022 and 1 more (4 updates tracked since 2020).

About William Charles Fox Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

WILLIAM CHARLES FOX MD (NPI 1629465638) is an individual anesthesiology provider in Sacramento, California, licensed in California (C205991) and active in the NPI registry since April 2015. He is enrolled in Medicare PECOS and is a graduate of Other (2013).

NPPES Registry Identity

NPI1629465638
Entity TypeIndividualMale
Primary Taxonomy207L00000X
Provider Legal NameWILLIAM CHARLES FOXCredential: MD
Location Address3315 WATT AVESacramento, CA 95821-3600
Mailing Address3315 Watt AveSacramento, CA 95821-3600 · (916) 481-6800 · Fax (916) 481-1881
Phone(916) 481-6800
Fax(916) 481-1881
Sole ProprietorYes
Medical School CMSOtherGraduated 2013
Enumeration DateApril 17, 2015
Last NPPES UpdateJanuary 15, 20264 updates tracked since enumeration
NPPES CertifiedJanuary 15, 2026
✔ NPI 1629465638 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyAnesthesiologyAllopathic & Osteopathic Physicians
Taxonomy Code207L00000X
Licenses✔ Licensed in CA · C205991✔ Licensed in HI · MD-22875
Definition
An anesthesiologist is trained to provide pain relief and maintenance, or restoration, of a stable condition during and immediately following an operation or an obstetric or diagnostic procedure. The anesthesiologist assesses the risk of the patient undergoing surgery and optimizes the patient's condition prior to, during and after surgery. In addition to these management responsibilities, the anesthesiologist provides medical management and consultation in pain management and critical care medicine. Anesthesiologists diagnose and treat acute, long-standing and cancer pain problems; diagnose and treat patients with critical illnesses or severe injuries; direct resuscitation in the care of patients with cardiac or respiratory emergencies, including the need for artificial ventilation; and supervise post-anesthesia recovery.
3315 WATT AVE, Sacramento, CA 95821
Open in Google Maps ↗

Group Practice 1

Group TaxonomyThis provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.193400000X SINGLE SPECIALTY GROUP

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Oscar Health, Oscar Insurance Company.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

William Charles Fox 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.

PECOS PAC ID2062826167
PECOS Enrollment IDI20260205002175
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignment

Medicare enrollment records show William Fox reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Central Anesthesia Service Exchange Medical Group, Inc.
Same address
Anesthesiology
3315 WATT AVE.
Sacramento, CA 95821
  • Reassigned Medicare billing, California enrollment
  • 167 clinicians in this Medicare group
NPI 1194826404 (916) 481-0777

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.

DR. J DAVID D'AMELIO M.D.
Anesthesiology
3315 WATT AVE
SACRAMENTO, CA 95821
Sacramento County (916) 481-6800
DR. BRANDY NICOLE GREENE M.D.
Anesthesiology
3315 WATT AVE
SACRAMENTO, CA 95821
Sacramento County (916) 481-0777
DR. KELLY ANN LENZ M.D.
Anesthesiology
3315 WATT AVE
SACRAMENTO, CA 95821
Sacramento County (916) 481-6800
FARIKH ALI
Anesthesiology
3315 WATT AVE
SACRAMENTO, CA 95821
Sacramento County (916) 481-6800
DR. LAI BUI M.D.
Anesthesiology
3315 WATT AVE
SACRAMENTO, CA 95821
Sacramento County (916) 481-6800
STEPHEN RAITHEL MD
Anesthesiology
3315 WATT AVE
SACRAMENTO, CA 95821
Sacramento County (916) 481-6800
DR. STEPHEN ALLAN MANNIS M.D.
Anesthesiology
3315 WATT AVE
SACRAMENTO, CA 95821
Sacramento County (916) 481-6800
DR. BRIAN ROBERT JONES M.D.
Anesthesiology
3315 WATT AVE
SACRAMENTO, CA 95821
Sacramento County (916) 481-6800

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 Fox's NPI number?

The NPI number for William Fox is 1629465638. It was assigned to this individual provider in the NPPES registry on April 17, 2015.

Where is William Fox located?

William Fox practices at 3315 Watt Ave, Sacramento, CA 95821. The listed phone number is (916) 481-6800.

What is William Fox's specialty?

The primary specialty registered for this NPI is Anesthesiology with taxonomy code 207L00000X.

Is William Fox enrolled in Medicare?

Yes. William Fox 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 organization bills Medicare for William Fox's services?

According to the CMS Revalidation Reassignment List (October 2026 release), William Fox reassigns Medicare benefits to Central Anesthesia Service Exchange Medical Group, Inc. (Sacramento, CA). The 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 Fox's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does William Fox accept?

Health plans from Oscar Health and Oscar Insurance Company list William Fox 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.

When was this NPI record last updated?

The NPPES record for William Fox was last updated on January 15, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 9 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.