Clark L. Williams, MD
Emergency Medicine Physician · Lancaster, WI
Clark L. Williams, MD is an emergency medicine physician with a practice address in Lancaster, Wisconsin, and NPI 1710911417, issued on Jul 10, 2006. Check the license (Wisconsin 42618, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Clark L. Williams
- Credential
- MD
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License numbers
- 42618 WI
37010 IA
Self-reported in NPPES; status is on the state search - Practice location
- 507 S Monroe St, Lancaster, WI 53813
- Phone
- (608) 723-2143
- Enumerated
- Jul 10, 2006
- Record last updated
- Sep 3, 2024
- Medicare enrollment
- Enrolled (PECOS I20070521000078); accepts Medicare assignment
- Medical or professional school
- University Of Wisconsin School Of Medicine, 1999
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 1,464 in Wisconsin → Look up another NPI →
Also registered at 507 S Monroe St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Angela Adams, PTPhysical Therapist1730548124
- Abby Allen, PA-CPhysician Assistant1528454584
- Michelle Bainbridge, CRNACertified Registered Nurse Anesthetist1073518601
- Bradley Binsfeld, DOOrthopaedic Surgery Physician1285837641
- Krynn Buckley, M.D.Reproductive Endocrinology Physician1063441277
- Abigail Burns, FNP-CFamily Nurse Practitioner1043773989
Verify Clark L. Williams in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 42618Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
9% fewer Medicare Part D claims than the average emergency medicine physician in 2024
206 Medicare Part D claims for 127 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D. Brand-name drugs were 8% of claims. 19 claims were for opioids.
Most prescribed
- Cephalexin16 claims
- Albuterol Sulfate Hfa14 claims
- Prednisone13 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
- Central Community HospitalElkader, IA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Clark L. Williams among 1,464 emergency medicine physician records in Wisconsin
Clark L. Williams, MD is one of 1,464 emergency medicine physician records with a practice address in Wisconsin. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 8% of them.
- NPI issued2006 · 8% of these records are older, 58% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 58% of these records are
- Graduated1999 · median 2011 among the 844 with a school on file
- Record last updated2024 · 50% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207P00000X and a Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Emergency Medicine Physician providers in Wisconsin
There are 1,464 emergency medicine physician records in Wisconsin.
All 1,464 in Wisconsin → Every provider in Lancaster → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Mitchell Lewis, MDPlatteville, WI 538181912956137
- Malcolm Lindsay, MDPlatteville, WI 538181205802121
- Nelly Amador, M.D., PMDBoscobel, WI 538051336119064
- Travis Baumann, MDBoscobel, WI 538051134782584
- Jonathan DemoryBoscobel, WI 538051760938138
- Justin Harrington, MDBoscobel, WI 538051487189312
- Paul Mariskanish, MDPrairie Du Chien, WI 538211003883976
- Jennifer Reink, D.O.Boscobel, WI 538051881121564
Common questions
What is Clark L. Williams, MD's NPI number?
Clark L. Williams, MD's National Provider Identifier (NPI) is 1710911417, issued on Jul 10, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Clark L. Williams, MD located?
The NPPES record lists a practice address at 507 S Monroe St, Lancaster, WI, 53813. Phone: (608) 723-2143. Providers update this record themselves, so call before visiting.
How can I verify Clark L. Williams, MD's license?
NPPES lists Wisconsin license number 42618, as entered by the provider. Search the Wisconsin Medical Examining Board at https://dsps.wi.gov/Pages/BoardsCouncils/MEB/Default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Clark L. Williams, MD prescribe under Medicare Part D?
In 2024, Clark L. Williams, MD had 206 Medicare Part D claims for 127 beneficiaries; the average among emergency medicine physician prescribers was 226. 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.