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

Dean J Williams, MD

Individual provider Emergency Medicine Physician · NPI 1104841501

Dean J Williams, MD practises Emergency Medicine in Erie, Colorado. Graduated from University of Calgary, Faculty of Medicine in 1994, 32 years ago. Practices with Geisinger Clinic, a 3,413-clinician group and accepts Medicare assignment. Licensed in California, Colorado, Hawaii and Iowa and 4 more.

Years since qualifying
32
Trained at
University of Calgary, Faculty of Medicine
Licensed in
CA, CO, HI, IA, ND, NE
In the registry since
2006
Specialties on file
8
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location PO Box

The provider listed a PO Box rather than a street location, so this is not a walk-in address.

PO Box 252
Erie, CO 80516-0252
Phone: (720) 505-1753
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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 48666 (CO)
Emergency Medicine Physician Taxonomy 207P00000X · Licence MD-48063 (IA)
Emergency Medicine Physician Taxonomy 207P00000X · Licence 61394-20 (WI)
Emergency Medicine Physician Taxonomy 207P00000X · Licence 26916 (NE)
Emergency Medicine Physician Taxonomy 207P00000X · Licence MD418570 (PA)
Emergency Medicine Physician Taxonomy 207P00000X · Licence MD17020 (HI)
Emergency Medicine Physician Taxonomy 207P00000X · Licence C205088 (CA)
Emergency Medicine Physician Taxonomy 207P00000X · Licence 15305 (ND)

Record details

NPI number1104841501
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedJuly 13, 2006
Last updated in NPPESJune 2, 2026
Certification dateJune 2, 2026

Medicare enrollment

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

Medicare specialtyEMERGENCY MEDICINE
Medical schoolUNIVERSITY OF CALGARY, FACULTY OF MEDICINE
Graduated 1994 (32 years in practice)
Group practice Geisinger Clinic — 3413 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations4 on file with Medicare

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 patients268
Services billed 305 a service is one billed item, such as a visit, a test or a procedure
Average patient age75

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. Those with a page here are linked.

Colleagues at Geisinger Clinic

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 3413 clinicians in the practice; 12 are shown here.

Other providers in Erie