Kathryn Sommer
Internal Medicine Physician · Chicago, IL
Kathryn Sommer is an internal medicine physician with a practice address in Chicago, Illinois, and NPI 1750070082, issued on May 3, 2023. Check the license (Illinois 036179573, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Kathryn Sommer
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 036179573 IL
Self-reported in NPPES; status is on the state search - Practice location
- 5841 S Maryland Ave, Chicago, IL 60637
- Phone
- (773) 702-6840
- Enumerated
- May 3, 2023
- Record last updated
- Jul 20, 2026
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 7,238 in Illinois → Look up another NPI →
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Verify Kathryn Sommer 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 036179573Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
82% fewer Medicare Part D claims than the average internal medicine physician in 2024
556 Medicare Part D claims for 116 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 18 claims were for opioids.
Most prescribed
- Amlodipine Besylate43 claims
- Atorvastatin Calcium39 claims
- Gabapentin25 claims
- Diclofenac Sodium18 claims
- Pantoprazole Sodium14 claims
- Nifedipine Er13 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.
Kathryn Sommer among 7,238 internal medicine physician records in Illinois
Kathryn Sommer 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 2023, is newer than 82% of them.
- NPI issued2023 · 82% of these records are older, 13% newer
- In a Medicare fileYes · 73% of these records are
- In the CMS Doctors and Clinicians fileNo · 50% of these records are
- Record last updated2026 · 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
- Jennifer AngelesChicago, IL 606371114945276
- Sameer Badlani, MDChicago, IL 606371699795302
- Kristine Bordenave, M.D.Chicago, IL 606371811009368
- Andrew DavisChicago, IL 606371275642167
- Hatim HassanChicago, IL 606371417970385
- Keiki Hinami, M.D.Chicago, IL 606371437136785
- David Liebovitz, MDChicago, IL 606371972564748
- Thomas Mason, M.D.Chicago, IL 606371730114505
Common questions
What is Kathryn Sommer's NPI number?
Kathryn Sommer's National Provider Identifier (NPI) is 1750070082, issued on May 3, 2023. An NPI identifies a provider in billing; it is not a license.
Where is Kathryn Sommer located?
The NPPES record lists a practice address at 5841 S Maryland Ave, Chicago, IL, 60637. Phone: (773) 702-6840. Providers update this record themselves, so call before visiting.
How can I verify Kathryn Sommer's license?
NPPES lists Illinois license number 036179573, 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 Kathryn Sommer prescribe under Medicare Part D?
In 2024, Kathryn Sommer had 556 Medicare Part D claims for 116 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.