Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Dr. William R. Marriott, MD

Individual provider Emergency Medicine Physician · NPI 1003907494

Dr. William R. Marriott, MD practises Emergency Medicine in Dayton, Ohio. Graduated from Wright State University Boonshoft School of Medicine in 1991, 35 years ago. Practices with Phs Emergency Billing LLC, a 71-clinician group and accepts Medicare assignment. Licensed in Ohio.

Years since qualifying
35
Trained at
Wright State University Boonshoft School of Medicine
Licensed in
OH
In the registry since
2006
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

1 Wyoming St
Dayton, OH 45409-2722 Not confirmed with CMS for 16 years — call before visiting
Phone: (513) 281-4400
Fax: (513) 587-8213
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Emergency Medicine Physician (primary) Taxonomy 207P00000X · Licence 35-063868 (OH)

Record details

NPI number1003907494
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedSeptember 28, 2006
Last updated in NPPESJuly 21, 2010

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyEMERGENCY MEDICINE
Medical schoolWRIGHT STATE UNIVERSITY BOONSHOFT SCHOOL OF MEDICINE
Graduated 1991 (35 years in practice)
Group practice Phs Emergency Billing Llc — 71 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients166
Services billed 178 a service is one billed item, such as a visit, a test or a procedure
Average patient age76

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at Phs Emergency Billing LLC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 71 clinicians in the practice; 12 are shown here.

Other providers in Dayton