Joel Wilsnack, M.D.
Internal Medicine Physician · Chicago, IL
Joel Wilsnack, M.D. is an internal medicine physician with a practice address in Chicago, Illinois, and NPI 1427083062, issued on Jul 12, 2006. Check the license on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Joel Wilsnack
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- Practice location
- 20 S Clark St, Chicago, IL 60603
- Phone
- (312) 926-7443
- Enumerated
- Jul 12, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20100805001169); accepts Medicare assignment
- Medical or professional school
- Northwestern University Feinberg Medical School, 1995
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 7,238 in Illinois → Look up another NPI →
Also registered at 20 S Clark St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Kristin Ballenger, DPTPhysical Therapist1639486657
- Amanda Chiagouris, D.P.T.Physical Therapist1972670677
- Elyse Esrig, M.D.Internal Medicine Physician1356388201
- Mary Gawne, APNNurse Practitioner1952315582
- Lorna Griffin, P.T.Physical Therapist1558387704
- Kenneth Hayes, M.D.Internal Medicine Physician1700812872
Verify Joel Wilsnack 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
5% fewer Medicare Part D claims than the average internal medicine physician in 2024
3,007 Medicare Part D claims for 281 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 12% of claims. 35 claims were for opioids.
Most prescribed
- Atorvastatin Calcium471 claims
- Amlodipine Besylate174 claims
- Levothyroxine Sodium161 claims
- Lisinopril156 claims
- Rosuvastatin Calcium154 claims
- Hydrochlorothiazide140 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 MIPS final score for 2023 (Medicare payment program): 94.1 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).
Industry payments in 2024: $61.55
2 payments; by number, the most common kind was food and beverage; the largest payer was Exact Sciences Corporation. The 50,334 providers of this specialty with any payment received $1,303.06 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Northwestern Medical Faculty FoundationChicago, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Joel Wilsnack among 7,238 internal medicine physician records in Illinois
Joel Wilsnack, M.D. is one of 7,238 internal medicine physician records with a practice address in Illinois. 73% 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 7% of them.
- NPI issued2006 · 7% of these records are older, 61% newer
- In a Medicare fileYes · 73% of these records are
- In the CMS Doctors and Clinicians fileYes · 50% of these records are
- Graduated1995 · median 2003 among the 3,580 with a school on file
- Record last updated2007 · 47% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
2,867 internal medicine physician records list a practice address in Chicago
They are 2,867 of the 63,379 NPPES records with a practice address in Chicago, and 7,238 internal medicine physician records in Illinois.
All 7,238 in Illinois → Every provider in Chicago → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Rebecca Anastos-Wallen, MDChicago, IL 606031720576820
- Mary Allison Arwady, MDChicago, IL 606031548421597
- Hyun Cho-Steinberg, MDChicago, IL 606031518075001
- Elyse Esrig, M.D.Chicago, IL 606031356388201
- Kenneth Hayes, M.D.Chicago, IL 606031700812872
- Jeffrey Kopin, M.D.Chicago, IL 606031093754970
- Charles Lo, MDChicago, IL 606031578635173
- Marilyn Pearson, MDChicago, IL 606031144267626
Common questions
What is Joel Wilsnack, M.D.'s NPI number?
Joel Wilsnack, M.D.'s National Provider Identifier (NPI) is 1427083062, issued on Jul 12, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Joel Wilsnack, M.D. located?
The NPPES record lists a practice address at 20 S Clark St, Chicago, IL, 60603. Phone: (312) 926-7443. Providers update this record themselves, so call before visiting.
How can I verify Joel Wilsnack, M.D.'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 Joel Wilsnack, M.D. prescribe under Medicare Part D?
In 2024, Joel Wilsnack, M.D. had 3,007 Medicare Part D claims for 281 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Joel Wilsnack, M.D.'s MIPS final score?
The 2023 MIPS final score is 94.1 of 100. The average among 454,083 clinicians with a measured score was 83.5.
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.