Mark Warnholz Williams, MD
Family Medicine Physician · Redmond, OR
Mark Warnholz Williams, MD is a family medicine physician with a practice address in Redmond, Oregon, and NPI 1942564281, issued on Jul 2, 2012. Check the license (Oregon MD174000, as entered in NPPES) on the Oregon Medical Board; the Medicare figures below come from public CMS files.
- Name
- Mark Warnholz Williams
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License numbers
- MD174000 OR
6536 AK
Self-reported in NPPES; status is on the state search - Practice location
- 211 NW Larch Ave, Redmond, OR 97756
- Phone
- (541) 548-2164
- Enumerated
- Jul 2, 2012
- Record last updated
- Apr 23, 2020 (not updated in 6 years: call before relying on the address or phone)
- Fax
- (541) 548-0534
- Medicaid ID
- MD8531 AK
- Medicare enrollment
- Enrolled (PECOS I20151009000527); accepts Medicare assignment
- Medical or professional school
- University Of Nevada School Of Medicine, 2012
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 2,847 in Oregon → Look up another NPI →
Also registered at 211 NW Larch Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Mark Warnholz Williams in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersOregon Medical Board
Search for license MD174000Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.5 times the Medicare Part D claims of the average family medicine physician in 2024
8,957 Medicare Part D claims for 678 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 10% of claims. 366 claims were for opioids.
Most prescribed
- Atorvastatin Calcium597 claims
- Lisinopril347 claims
- Levothyroxine Sodium344 claims
- Metoprolol Succinate308 claims
- Losartan Potassium286 claims
- Amlodipine Besylate239 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- St Charles Health System IncRedmond, OR
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mark Warnholz Williams among 2,847 family medicine physician records in Oregon
Mark Warnholz Williams, MD is one of 2,847 family medicine physician records with a practice address in Oregon. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2012, is newer than 68% of them.
- NPI issued2012 · 68% of these records are older, 30% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 59% of these records are
- Graduated2012 · median 2009 among the 1,671 with a school on file
- Record last updated2020 · 57% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a Oregon practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
24 family medicine physician records list a practice address in Redmond
They are 24 of the 1,053 NPPES records with a practice address in Redmond, and 2,847 family medicine physician records in Oregon.
All 2,847 in Oregon → Every provider in Redmond → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Steven Cross, M.D.Redmond, OR 977561841296027
- James Detwiler, MDRedmond, OR 977561154364024
- Alan Hilles, MDRedmond, OR 977561003905027
- Mark Hughes, D.O.Redmond, OR 977561528174893
- Pamela Irby, MDRedmond, OR 977561295773901
- Guy McElroy, M.D.Redmond, OR 977561568468478
- Daniel Murphy, MDRedmond, OR 977561932142510
- Sheryl Norris, MDRedmond, OR 977561154362291
Common questions
What is Mark Warnholz Williams, MD's NPI number?
Mark Warnholz Williams, MD's National Provider Identifier (NPI) is 1942564281, issued on Jul 2, 2012. An NPI identifies a provider in billing; it is not a license.
Where is Mark Warnholz Williams, MD located?
The NPPES record lists a practice address at 211 NW Larch Ave, Redmond, OR, 97756. Phone: (541) 548-2164. Providers update this record themselves, so call before visiting.
How can I verify Mark Warnholz Williams, MD's license?
NPPES lists Oregon license number MD174000, as entered by the provider. Search the Oregon Medical Board at https://www.oregon.gov/OMB/Pages/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Mark Warnholz Williams, MD prescribe under Medicare Part D?
In 2024, Mark Warnholz Williams, MD had 8,957 Medicare Part D claims for 678 beneficiaries; the average among family medicine physician prescribers was 3,544. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.