Eric R. Kallwitz, M.D.
Gastroenterology Physician · Chicago, IL
Eric R. Kallwitz, M.D. is a gastroenterology physician with a practice address in Chicago, Illinois, and NPI 1275716607, issued on Dec 7, 2007. Check the license (Illinois 036113292, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Eric R. Kallwitz
- Credential
- M.D.
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- 036113292 IL
Self-reported in NPPES; status is on the state search - Practice location
- 840 S Wood St FL 7, Chicago, IL 60612
- Phone
- (312) 996-6651
- Enumerated
- Dec 7, 2007
- Record last updated
- Jan 31, 2023
- Medicare enrollment
- Enrolled (PECOS I20080925000180); accepts Medicare assignment
- Medical or professional school
- Rush Medical College Of Rush University, 2002
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 887 in Illinois → Look up another NPI →
Verify Eric R. Kallwitz in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIllinois Department of Financial and Professional Regulation
Search for license 036113292Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.8 times the Medicare Part D claims of the average gastroenterology physician in 2024
2,294 Medicare Part D claims for 272 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 8% of claims.
Most prescribed
- Ursodiol245 claims
- Carvedilol212 claims
- Furosemide190 claims
- Tacrolimus167 claims
- Spironolactone149 claims
- Mycophenolic Acid82 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.
One hospital affiliation
- Loyola University Medical CenterMaywood, IL · Acute Care Hospitals2 of 5 stars
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through); hospitals matched to CMS Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.
Eric R. Kallwitz among 887 gastroenterology physician records in Illinois
Eric R. Kallwitz, M.D. is one of 887 gastroenterology physician records with a practice address in Illinois. 85% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 48% of them.
- NPI issued2007 · 48% of these records are older, 45% newer
- In a Medicare fileYes · 85% of these records are
- In the CMS Doctors and Clinicians fileYes · 72% of these records are
- Graduated2002 · median 2003 among the 643 with a school on file
- Record last updated2023 · 49% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0100X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gastroenterology Physician providers in Illinois
There are 887 gastroenterology physician records in Illinois.
All 887 in Illinois → Every provider in Chicago → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Frida Abrahamian, MDChicago, IL 606121447274279
- Purnima Balachandran, MDChicago, IL 606121659318509
- Michael Brown, M.D.Chicago, IL 606121265477293
- Keith Bruninga, M.D.Chicago, IL 606121881638823
- Mark Demeo, M.D.Chicago, IL 606121972549327
- Mohammad Fayyaz, MDChicago, IL 606121992731616
- Benjamin Go, M.D.Chicago, IL 606121982624946
- Ali Keshavarzian, M.D.Chicago, IL 606121558302257
Common questions
What is Eric R. Kallwitz, M.D.'s NPI number?
Eric R. Kallwitz, M.D.'s National Provider Identifier (NPI) is 1275716607, issued on Dec 7, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Eric R. Kallwitz, M.D. located?
The NPPES record lists a practice address at 840 S Wood St FL 7, Chicago, IL, 60612. Phone: (312) 996-6651. Providers update this record themselves, so call before visiting.
How can I verify Eric R. Kallwitz, M.D.'s license?
NPPES lists Illinois license number 036113292, as entered by the provider. 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 Eric R. Kallwitz, M.D. prescribe under Medicare Part D?
In 2024, Eric R. Kallwitz, M.D. had 2,294 Medicare Part D claims for 272 beneficiaries; the average among gastroenterology physician prescribers was 811. 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.