Dr. Donald L. Williams, MD
- Medicare services, 2018
- 54
- Part D claims, 2024
- 221
- Hospital affiliations
- 1
- Industry payments
- $38
- Medical groups
- 2
- Practice address
- 611 Sherman Ave E, Fort Atkinson, WI 53538
- Practice phone
- Call (920) 568-5000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Williams' professional email, personal email and mobile number
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Dr. Donald L. Williams is an internist in Fort Atkinson, Wisconsin
Dr. Williams practices at Fort Memorial Hospital in Fort Atkinson, Wisconsin, part of Fort HealthCare.
Dr. Williams' NPI, 1326043266, was assigned on June 16, 2005. Dr. Williams graduated from University of Illinois College of Medicine at Chicago in 1976. Dr. Williams holds Wisconsin license 23304.
- NPI
- 1326043266NPI Registry (opens in a new tab)
- NPI enumeration date
- June 16, 2005
- NPI status
- Active
- Practice phone
- (920) 568-5000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 76
- Medical school graduation
- 1976
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Dr. Donald L. Williams practices at Fort Memorial Hospital in Fort Atkinson, Wisconsin
Dr. Williams' primary practice is Fort Memorial Hospital, at 611 Sherman Ave E, Fort Atkinson, WI 53538 in Jefferson County. The practice phone is (920) 568-5000.
- Fort Memorial Hospital611 Sherman Ave E, Fort Atkinson, WI 53538 · Jefferson CountyPhone(920) 568-5000
Source: Dmand AI Affiliation Data
Dr. Donald L. Williams is affiliated with 3 sites of care and 2 medical groups
Dr. Williams' primary practice is Fort Memorial Hospital in Fort Atkinson, Wisconsin, part of Fort HealthCare. The medical group on file is Fort HealthCare. Dmand AI also links Dr. Williams to 1 more community health center, 1 group practice or clinic and 1 medical group, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Donald 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 |
|---|---|
| Fort Memorial Hospital | Available with a free account |
| +2 more sites and 1 medical group | 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 Fort HealthCare and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Donald L. Williams is one of 1,675 internists in Wisconsin
Internal medicine is Dr. Williams' primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Williams is licensed in Wisconsin.
Specialties and state licenses
- Internal medicine, WisconsinPrimary
Clinical focus
Dmand AI lists chronic diabetes, high cholesterol and lower back pain among the conditions Dr. Williams treats.
Internists near Dr. Williams
Counts of internists 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. Donald L. Williams billed Medicare for 54 services in 2018
CMS data shows 54 Medicare services from Dr. Williams across 2 procedure codes in 2018, all of them office visits. Medicare paid $1,850 for them. Every service was in an office.
Dr. Williams' Medicare services by type, 2017 to 2018
- 2017
- 2018
- Office and hospital visits
- 2017: 652018: 5417%
Dr. Williams compared with the Wisconsin median for internists, 2018
- Dr. Williams
- Wisconsin median
- Medicare services
- 54vs 45788% below
- Part D claims
- 111vs 43374% below
Medians across 1,658 internists in Wisconsin with Dmand AI profiles that report each measure.
Dr. Williams' most billed Medicare procedure codes, 2018
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for Dr. Williams?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Williams and other internists in Wisconsin.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Donald L. Williams' patients have a median age of 18
Across all payers, Dmand AI patient panel data puts Dr. Williams' median patient age at 18, with 47% women.
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 18
Patient panel by sex, all payers
- Women47%
- Men53%
Source: Dmand AI Patient Panel Data
Dr. Donald L. Williams wrote 221 Medicare Part D claims in 2024
In 2024, Dr. Williams wrote 221 Medicare Part D claims for 12 patients. 92% of them were for generic drugs. CMS names the drug for 111 of them, across 7 drugs with 11 or more claims each, at $1,751 in total drug cost. In 2023, CMS named 24 claims across 2 drugs.
Dr. Williams' Part D claims by kind of drug, 2024
- Generic204 claims92%
- Brand-name17 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.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 242024: 111363%
Drugs named by CMS: 7 in 2024, 2 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
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Dr. Donald L. Williams received $38 in industry payments from 2017 to 2025
CMS Open Payments shows 2 general payments to Dr. Williams from 2 drug and device companies from 2017 to 2025. Food and beverage make up the largest share, 100% of the total. Novo Nordisk Inc paid the most, $26.
General payments to Dr. Williams by program year, 2017 to 2025
Companies that paid Dr. Williams the most, 2017 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Donald L. Williams graduated from University of Illinois College of Medicine at Chicago
Dr. Williams graduated from University of Illinois College of Medicine at Chicago in 1976.
- Medical school
Source: Dmand AI Professional Profile Data
Dr. Donald L. Williams accepts plans from 14 insurance carriers
Dr. Williams is in network with 14 carriers, including Blue Cross Blue Shield of Michigan, United Healthcare and Blue Cross Blue Shield of Massachusetts. PPO plans come from the most carriers, 9. Check the plan with the practice before a visit.
- Blue Cross Blue Shield of Michigan
- United Healthcare
- Blue Cross Blue Shield of Massachusetts
- Dean Health Plan
- Elevance
- HCSC
- Humana
- Molina
- +6 more carriersWith a free account
Plan types Dr. Williams accepts, by number of carriers
- PPO9
- Medicare8
- HMO6
- Medicaid2
- POS2
Source: Dmand AI Insurance Network Data
Sources for Dr. Donald 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 Data |
| 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) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network 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. Donald 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. Donald L. Williams' NPI number?
Dr. Donald L. Williams' NPI number is 1326043266. It was assigned on June 16, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. Donald L. Williams?
Dr. Donald L. Williams is an internist in Fort Atkinson, Wisconsin. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Donald L. Williams practice?
Dr. Williams practices at 611 Sherman Ave E, Fort Atkinson, WI 53538. Dr. Williams' primary practice is Fort Memorial Hospital in Fort Atkinson, Wisconsin, part of Fort HealthCare. Dmand AI also links Dr. Williams to 1 community health center, 1 group practice or clinic and 1 medical group.
What is Dr. Donald L. Williams' office phone number?
The practice phone on file for Dr. Williams is (920) 568-5000.
What is Dr. Donald L. Williams' medical license number?
Dr. Williams holds Wisconsin license 23304.
Which hospitals is Dr. Donald L. Williams affiliated with?
Dr. Williams practices at Fort Memorial Hospital in Fort Atkinson, Wisconsin.
What medical group is Dr. Donald L. Williams part of?
Dr. Williams is linked to Fort HealthCare. Dmand AI links Dr. Williams to 1 more medical group.
Does Dr. Donald L. Williams accept Medicare?
Yes. CMS data shows Dr. Williams billed Medicare for 54 services in 2018.
What services does Dr. Donald L. Williams bill to Medicare?
In 2018, Dr. Williams' most billed Medicare services were office visit, established patient (99213) and office visit, established patient (99214).
Where did Dr. Donald L. Williams go to medical school?
Dr. Williams graduated from University of Illinois College of Medicine at Chicago in 1976.
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What drugs does Dr. Donald L. Williams prescribe most?
In 2024 Medicare Part D data, Dr. Williams' most prescribed drugs by claims were Atorvastatin Calcium, Levothyroxine Sodium and Tamsulosin HCl.
Has Dr. Donald L. Williams received payments from drug or device companies?
CMS Open Payments shows $38 in general payments to Dr. Williams from 2 companies from 2017 to 2025. The largest total came from Novo Nordisk Inc.
How long has Dr. Donald L. Williams been practicing?
Dr. Williams graduated from medical school in 1976, 50 years ago.
What insurance does Dr. Donald L. Williams accept?
Dr. Williams is in network with 14 carriers, including Blue Cross Blue Shield of Michigan, United Healthcare and Blue Cross Blue Shield of Massachusetts. PPO plans come from the most carriers, 9. Check the plan with the practice before a visit.
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