Thomas Edwin Klarquist, M.D.
Internal Medicine Physician · Chicago, IL
Thomas Edwin Klarquist, M.D. is an internal medicine physician with a practice address in Chicago, Illinois, and NPI 1477517373, issued on Apr 17, 2006. Check the license (Illinois 036100647, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Thomas Edwin Klarquist
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 036100647 IL
Self-reported in NPPES; status is on the state search - Practice location
- 3134 N Clark St, Chicago, IL 60657
- Phone
- (773) 296-5090
- Enumerated
- Apr 17, 2006
- Record last updated
- Mar 26, 2025
- Fax
- (312) 766-4908
- Medicare enrollment
- Enrolled (PECOS I20040924000628); accepts Medicare assignment
- Medical or professional school
- Michigan State University College Of Human Medicine, 1987
- 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 3134 N Clark St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Thomas Edwin Klarquist 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 036100647Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
18% more Medicare Part D claims than the average internal medicine physician in 2024
3,754 Medicare Part D claims for 339 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 21% of claims. 50 claims were for opioids.
Most prescribed
- Atorvastatin Calcium317 claims
- Lisinopril182 claims
- Amlodipine Besylate138 claims
- Levothyroxine Sodium108 claims
- Metformin Hcl96 claims
- Metoprolol Succinate93 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.
Bills Medicare through one group practice
- Advocate Health And Hospitals CorporationBuffalo Grove, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Thomas Edwin Klarquist among 7,238 internal medicine physician records in Illinois
Thomas Edwin Klarquist, 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
- Graduated1987 · median 2003 among the 3,580 with a school on file
- Record last updated2025 · 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
- Bruce Blacker, M.D.Chicago, IL 606571982603924
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- Edgar Borda, MDChicago, IL 606571891782447
- Harold EulienChicago, IL 606571700877222
- Lisa Greising, M.D.Chicago, IL 606571578523155
- Michael Grendon, M.D.Chicago, IL 606571922007962
- Catherine Kallal, MDChicago, IL 606571407801665
- Alam Khan, M.D.Chicago, IL 606571316946288
Common questions
What is Thomas Edwin Klarquist, M.D.'s NPI number?
Thomas Edwin Klarquist, M.D.'s National Provider Identifier (NPI) is 1477517373, issued on Apr 17, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Thomas Edwin Klarquist, M.D. located?
The NPPES record lists a practice address at 3134 N Clark St, Chicago, IL, 60657. Phone: (773) 296-5090. Providers update this record themselves, so call before visiting.
How can I verify Thomas Edwin Klarquist, M.D.'s license?
NPPES lists Illinois license number 036100647, 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 Thomas Edwin Klarquist, M.D. prescribe under Medicare Part D?
In 2024, Thomas Edwin Klarquist, M.D. had 3,754 Medicare Part D claims for 339 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.