Don Williams, MD
Internal Medicine Physician · Oak Park, IL
Don Williams, MD is an internal medicine physician with a practice address in Oak Park, Illinois, and NPI 1447288287, issued on Jun 29, 2006. Check the license on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Don Williams
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- Practice location
- 1100 Lake St Ste 230, Oak Park, IL 60301
- Phone
- (331) 221-9001
- Enumerated
- Jun 29, 2006
- Entity
- Type 1 · individual
Also registered at 1100 Lake St Ste 230
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Don Williams in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIllinois Department of Financial and Professional RegulationCheck the board
- 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS, AOA, NCCPA, AANPNot checked
76% more Medicare Part D claims than the average internal medicine physician in 2024
4,892 Medicare Part D claims for 335 beneficiaries, against an average of 2,785 among the 127,794 providers of this specialty who prescribed in Part D. 174 claims were for opioids.
Most prescribed
- Atorvastatin Calcium357 claims
- Pantoprazole Sodium174 claims
- Alprazolam164 claims
- Lisinopril151 claims
- Metformin Hcl151 claims
- Gabapentin144 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.
The Medicare quality score for 2023: 91.4 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
2 hospital and facility affiliations
- Dynamic Physical Therapy, Inc.Oak Park, IL
- Endeavor Health Medical GroupElmhurst, IL
Source: CMS Doctors and Clinicians affiliations; Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.
67 internal medicine physician records list a Oak Park practice address
They are 67 of the 2,307 NPPES records with a Oak Park practice address, and 8,522 internal medicine physician records in Illinois.
All 67 in Oak Park → All 8,522 in Illinois → Every provider in Oak Park →
Other internal medicine physician records in Illinois
- Peter Abadeer, D.O.Bloomington, IL1760469522
- Pamela Abadi, D.O.Winfield, IL1588820179
- Motaz Abas, MDPeoria, IL1215510201
- Elias Abate, M.D.Chicago, IL1336712199
- Maliha Abbas, D.O.Chicago, IL1174963920
- Zareena Abbas, MDChicago, IL1427078872
- Abu Abbasi, MDChicago, IL1083243877
- Ayesha Abbasi, MDChicago, IL1376216705
- Khalda Abbasi, MDNaperville, IL1487705240
- Misha Abbasi, MDChicago, IL1770111635
Common questions
What is Don Williams, MD's NPI number?
Don Williams, MD's National Provider Identifier (NPI) is 1447288287, issued on Jun 29, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Don Williams, MD located?
The NPPES record lists a practice address at 1100 Lake St Ste 230, Oak Park, IL, 60301. Phone: (331) 221-9001. Providers update this record themselves, so call before visiting.
How can I verify Don Williams, MD's license?
Search the Illinois Department of Financial and Professional Regulation at https://idfpr.illinois.gov/checklicense.html. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Don Williams, MD prescribe under Medicare Part D?
In 2024, Don Williams, MD had 4,892 Medicare Part D claims for 335 beneficiaries; the average among internal medicine physician prescribers was 2,785. Part D covers Medicare prescriptions only.
What is Don Williams, MD's Medicare quality score?
The 2023 MIPS final score is 91.4 of 100. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), loaded Aug 27, 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.
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 27, 2026.