Dr. Clark L. Williams, MD
- Medicare services, 2024
- 12
- Medicare patients, 2024
- 32
- Part D claims, 2024
- 206
- Hospital affiliations
- 3
- Medical groups
- 4
- Practice address
- 507 S Monroe St, Lancaster, WI 53813
- Practice phone
- Call (608) 723-2143
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
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Dr. Clark L. Williams is an emergency medicine physician in Lancaster, Wisconsin
Dr. Williams practices at Grant Regional Health Center in Lancaster, Wisconsin, part of Grant Regional.
Dr. Williams' NPI, 1710911417, was assigned on July 10, 2006. Dr. Williams graduated from University of Wisconsin School of Medicine in 1999. Dr. Williams holds Wisconsin license 42618.
- NPI
- 1710911417NPI Registry (opens in a new tab)
- Medicare PAC ID
- 0749173151
- NPI enumeration date
- July 10, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (608) 723-2143
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 53
- Medical school graduation
- 1999
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Clark L. Williams practices at Grant Regional Health Center in Lancaster, Wisconsin
Dr. Williams' primary practice is Grant Regional Health Center, at 507 S Monroe St, Lancaster, WI 53813 in Grant County. The practice phone is (608) 723-2143.
- Grant Regional Health Center507 S Monroe St, Lancaster, WI 53813 · Grant CountyPhone(608) 723-2143
Source: Dmand AI Affiliation Data
Dr. Clark L. Williams is affiliated with 3 sites of care and 4 medical groups
Dr. Williams' primary practice is Grant Regional Health Center in Lancaster, Wisconsin, part of Grant Regional. Dr. Williams is also affiliated with UnityPoint Health - Finley Hospital. The medical group on file is Grant Regional Health Center. Dmand AI also links Dr. Williams to 1 more hospital and 3 medical groups, each named with a free account. Dr. Williams' employer is on file too: a hospital.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Clark L. Williams' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Williams practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Grant Regional Health Center | Available with a free account |
| +2 more sites and 3 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across Grant Regional and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Clark L. Williams is one of 1,211 emergency medicine physicians in Wisconsin
Emergency medicine is Dr. Williams' primary specialty in the NPI Registry, under taxonomy code 207P00000X. Dmand AI has Dr. Williams' licenses on file in 2 states: Wisconsin and Iowa.
Specialties and state licenses
- Emergency medicine, WisconsinPrimary
- Iowa license
Emergency medicine physicians near Dr. Williams
Counts of emergency medicine physicians with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Clark L. Williams billed Medicare for 12 services in 2024
CMS data shows 12 Medicare services from Dr. Williams across 1 procedure code in 2024, for 32 Medicare patients. Medicare paid $72 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Williams' Medicare services by type, 2023 to 2024
- 2023
- 2024
- Tests and treatments
- 2023: 02024: 12
- Office and hospital visits
- 2023: 172024: 0100%
Dr. Williams compared with the Wisconsin median for emergency medicine physicians, 2024
- Dr. Williams
- Wisconsin median
- Medicare services
- 12vs 24695% below
- Medicare patients
- 32vs 22186% below
- Part D claims
- 43vs 5725% below
Medians across 1,249 emergency medicine physicians in Wisconsin with Dmand AI profiles that report each measure.
Dr. Williams' most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Williams and other emergency medicine physicians in Wisconsin.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Clark L. Williams treated 32 Medicare patients in 2024, average age 75
CMS counts 32 Medicare patients who saw Dr. Williams in 2024. The largest group is 65 to 74, with 14 patients. 75% of them have high blood pressure, and 72% have high cholesterol. Their average risk score is 1.75, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Williams' median patient age at 50, with 55% women.
Dr. Williams' Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Williams' Medicare patients by sex, 2024
- Women2166%
- Men1134%
Chronic conditions among Dr. Williams' Medicare patients, 2024
- High blood pressure75%
- High cholesterol72%
- Diabetes56%
- Arthritis53%
- Heart failure53%
- Chronic kidney disease47%
- Mood disorders41%
- Depression38%
Share of Medicare patients with each condition. A patient can have several.
Dr. Williams' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 50
Patient panel by sex, all payers
- Women55%
- Men45%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Clark L. Williams wrote 206 Medicare Part D claims in 2024
In 2024, Dr. Williams wrote 206 Medicare Part D claims for 127 patients. 92% of them were for generic drugs. CMS names the drug for 43 of them, across 3 drugs with 11 or more claims each, at $583 in total drug cost. In 2023, CMS named 40 claims across 3 drugs.
Dr. Williams' Part D claims by kind of drug, 2024
- Generic190 claims92%
- Brand-name16 claims8%
Dr. Williams' most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Williams' Part D claims, 2024
- Opioids9%19 of 206 claims
- Antibiotics40%82 of 206 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 402024: 438%
Drugs named by CMS: 3 in 2024, 3 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Dr. Clark L. Williams takes part in Medicare
Dr. Williams accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Clark L. Williams graduated from University of Wisconsin School of Medicine
Dr. Williams graduated from University of Wisconsin School of Medicine in 1999.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Clark L. Williams's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Clark L. Williams
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Clark L. Williams' NPI number?
Dr. Clark L. Williams' NPI number is 1710911417. It was assigned on July 10, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Clark L. Williams?
Dr. Clark L. Williams is an emergency medicine physician in Lancaster, Wisconsin. The primary specialty in the NPI Registry is Emergency Medicine Physician (taxonomy code 207P00000X).
Where does Dr. Clark L. Williams practice?
Dr. Williams practices at 507 S Monroe St, Lancaster, WI 53813. Dr. Williams' primary practice is Grant Regional Health Center in Lancaster, Wisconsin, part of Grant Regional. Dmand AI also links Dr. Williams to 1 hospital and 3 medical groups.
What is Dr. Clark L. Williams' office phone number?
The practice phone on file for Dr. Williams is (608) 723-2143.
What is Dr. Clark L. Williams' medical license number?
Dr. Williams holds Wisconsin license 42618, one of the licenses on file in 2 states.
Which states has Dr. Clark L. Williams been licensed in?
Dmand AI has state licenses on file for Dr. Williams in Wisconsin and Iowa.
Which hospitals is Dr. Clark L. Williams affiliated with?
Dr. Williams practices at Grant Regional Health Center in Lancaster, Wisconsin. Dr. Williams is also affiliated with UnityPoint Health - Finley Hospital. Dmand AI links Dr. Williams to 1 more hospital.
What medical group is Dr. Clark L. Williams part of?
Dr. Williams is linked to Grant Regional Health Center. Dmand AI links Dr. Williams to 3 more medical groups.
Does Dr. Clark L. Williams accept Medicare?
Yes. CMS data shows Dr. Williams billed Medicare for 12 services in 2024, and Dr. Williams accepts Medicare assignment.
How many Medicare patients does Dr. Clark L. Williams see?
CMS counts 32 Medicare patients who saw Dr. Williams in 2024, with an average age of 75.
Show 4 more questionsShow fewer questions
What services does Dr. Clark L. Williams bill to Medicare?
In 2024, Dr. Williams' most billed Medicare services were heart test or procedure (93010).
Where did Dr. Clark L. Williams go to medical school?
Dr. Williams graduated from University of Wisconsin School of Medicine in 1999.
What drugs does Dr. Clark L. Williams prescribe most?
In 2024 Medicare Part D data, Dr. Williams' most prescribed drugs by claims were Cephalexin, Albuterol Sulfate Hfa and Prednisone.
How long has Dr. Clark L. Williams been practicing?
Dr. Williams graduated from medical school in 1999, 27 years ago.
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