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DR. WILLIAM RICHARD FOX MD
NPI 1588075634
Emergency Medicine in Washington, DC

Active since May 12, 2014PECOS EnrolledAccepts Medicare Assignment
2401 E ST., NW, SA-1, WASHINGTON, DC 20037(202) 647-4000 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 21, 2022, Dec 7, 2017 and 1 more (4 updates tracked since 2017).

About Dr. William Richard Fox Md NPPES

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

DR. WILLIAM RICHARD FOX MD (NPI 1588075634) is an individual emergency medicine provider in Washington, District Of Columbia, licensed in District Of Columbia (MD600004278) and active in the NPI registry since May 2014. He is enrolled in Medicare PECOS, is affiliated with Guam Memorial Hospital Authority, and is a graduate of Icahn School Of Medicine At Mount Sinai (2014).

NPPES Registry Identity

NPI1588075634
Entity TypeIndividualMale
Primary Taxonomy207P00000X
Provider Legal NameDR. WILLIAM RICHARD FOXCredential: MD
Location Address2401 E ST., NW, SA-1Washington, DC 20037
Mailing Address2401 E. St Nw, Sa-1Washington, DC 20037 · (202) 647-4000
Phone(202) 647-4000
Sole ProprietorNo
Medical School CMSIcahn School Of Medicine At Mount SinaiGraduated 2014
Enumeration DateMay 12, 2014
Last NPPES UpdateJanuary 15, 20264 updates tracked since enumeration
NPPES CertifiedJanuary 15, 2026
✔ NPI 1588075634 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyEmergency MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207P00000X
Licenses✔ Licensed in DC · MD600004278✔ Licensed in TX · R0572
Definition
An emergency physician focuses on the immediate decision making and action necessary to prevent death or any further disability both in the pre-hospital setting by directing emergency medical technicians and in the emergency department. The emergency physician provides immediate recognition, evaluation, care, stabilization and disposition of a generally diversified population of adult and pediatric patients in response to acute illness and injury.
2401 E ST., NW, Washington, DC 20037
Open in Google Maps ↗

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Baylor Scott and White Health Plan, Blue Cross and Blue Shield of Texas, CareSource and more.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

Dr. William Richard 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 ID9537437678
PECOS Enrollment IDI20251209004476
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.

Guam Memorial Hospital
General Acute Care Hospital
850 GOVERNOR CARLOS CAMACHO ROAD
Oka Tamuning, GU 96913
  • Reassigned Medicare billing, Guam enrollment
  • 320 clinicians in this Medicare group
NPI 1366519027 (671) 647-2937

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

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Guam Memorial Hospital Authority

Acute Care Hospitals · Tamuning, GU
2/5 CMS rating
OwnershipGovernment - Local
CMS Certification Number650001
Location85O Gov Carlos G Camacho RoadTamuning, GU 96913 · Guam County
Emergency services

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 20037 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$100.31 typical visit price
range $65.18 – $194.86
Typical copayment $25.07 (range $16.29 – $48.71)
Most-billed visit code 99203
Established Patient
$113.72 typical visit price
range $21.40 – $158.88
Typical copayment $28.43 (range $5.35 – $39.72)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

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 1588075634. It was assigned to this individual provider in the NPPES registry on May 12, 2014.

Where is William Fox located?

William Fox practices at 2401 E St., NW Sa-1, Washington, DC 20037. The listed phone number is (202) 647-4000.

What is William Fox's specialty?

The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.

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 Guam Memorial Hospital (Oka Tamuning, GU). 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 Baylor Scott and White Health Plan, Blue Cross and Blue Shield of Texas, CareSource, 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.

Is William Fox affiliated with any hospitals?

According to CMS data, William Fox is affiliated with Guam Memorial Hospital Authority.

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.