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

Mark Warnholz Williams, MD

Individual provider Family Medicine Physician · NPI 1942564281

Mark Warnholz Williams, MD is registered under Family Practice in Redmond, Oregon. Graduated from University of Nevada School of Medicine in 2012, 14 years ago. Practices with St Charles Health System Inc, a 383-clinician group, accepts Medicare assignment and offers telehealth. Licensed in Alaska and Oregon.

Years since qualifying
14
Trained at
University of Nevada School of Medicine
Licensed in
AK, OR
In the registry since
2012
Specialties on file
2
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

211 NW Larch Ave
Redmond, OR 97756-1357
Phone: (541) 548-2164
Fax: (541) 548-0534
Show map & directions

Directions in Google Maps · Apple Maps · OpenStreetMap

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Family Medicine Physician (primary) Taxonomy 207Q00000X · Licence MD174000 (OR)
Family Medicine Physician Taxonomy 207Q00000X · Licence 6536 (AK)

Record details

NPI number1942564281
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJuly 2, 2012
Last updated in NPPESApril 23, 2020
Certification dateApril 23, 2020

Medicare enrollment

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

Medicare specialtyFAMILY PRACTICE
Medical schoolUNIVERSITY OF NEVADA SCHOOL OF MEDICINE
Graduated 2012 (14 years in practice)
Group practice St Charles Health System Inc — 383 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services
Practice locations2 on file with Medicare

Procedures

From CMS Care Compare, which counts the procedures a clinician billed to Original Medicare and Medicare Advantage over a recent 12-month period. CMS reports a fixed list of common procedures, so this is not everything the clinician does. Counts of 10 or fewer are given as a range, because CMS withholds small numbers.

Removal of skin lesions 11 times · 58th percentile
Melanoma (skin cancer) excision 1–10 times
Removal of nail tissue 1–10 times
Skin biopsy 1–10 times

The percentile compares how often this clinician performed the procedure with other clinicians who performed it, as CMS calculates it. It measures volume, not outcomes or skill.

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 patients409
Services billed 2,168 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. Those with a page here are linked.

  • St Charles Medical Center - Bend Hospital · Bend, OR · listed as St Charles Medical Center
  • Home Health Of Northwest, Llc Home health agency · Bend, OR
  • Partners Home Health Home health agency · Bend, OR · listed as Partners Home Health LLC
  • St Charles Madras Hospital · Madras, OR
  • St Charles Medical Center Prineville Hospital · Prineville, OR
  • Mission Home Health Of Bend Home health agency · Bend, OR
  • St. Charles Home Health Services Home health agency · Bend, OR

Colleagues at St Charles Health System Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 383 clinicians in the practice; 12 are shown here.

Other providers in Redmond