Catherine Sabu Thomas, M.D.
Internal Medicine Physician · St Charles, IL
Catherine Sabu Thomas, M.D. is an internal medicine physician with a practice address in St Charles, Illinois, and NPI 1295785756, issued on May 12, 2006. Check the license (Illinois 036-091979, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Catherine Sabu Thomas
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 036-091979 IL
Self-reported in NPPES; status is on the state search - Practice location
- 2570 Foxfield RD, St Charles, IL 60174
- Phone
- (630) 584-1950
- Enumerated
- May 12, 2006
- Record last updated
- Jul 30, 2018 (not updated in 8 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20050728000261); accepts Medicare assignment
- 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 2570 Foxfield RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Amy Frazer, PA-CPhysician Assistant1144381823
- Sarah Reszke, LPCProfessional Counselor1356057517
- Steve Thiel, PA-CPhysician Assistant1386705085
Verify Catherine Sabu Thomas 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 036-091979Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
3.6 times the Medicare Part D claims of the average internal medicine physician in 2024
11,295 Medicare Part D claims for 854 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. 141 claims were for opioids.
Most prescribed
- Atorvastatin Calcium692 claims
- Rosuvastatin Calcium650 claims
- Levothyroxine Sodium503 claims
- Lisinopril423 claims
- Amlodipine Besylate373 claims
- Metoprolol Succinate361 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).
Bills Medicare through 2 group practices
- Central Dupage Physician GroupSt Charles, IL
- Dynamic Physical Therapy, Inc.Oak Park, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Catherine Sabu Thomas among 7,238 internal medicine physician records in Illinois
Catherine Sabu Thomas, 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
- Graduated1989 · median 2003 among the 3,580 with a school on file
- Record last updated2018 · 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).
Internal Medicine Physician providers in Illinois
There are 7,238 internal medicine physician records in Illinois.
All 7,238 in Illinois → Every provider in St Charles → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Zbigniew Ciechanowski, M.D.St Charles, IL 601741467452573
- Marissa Jama, DOSt Charles, IL 601741962146258
- Scott McNaughton, M.D.St Charles, IL 601741073510335
- Laura Tagle, MDSt Charles, IL 601741053440008
- Vivian Vanroekel, M.D.St Charles, IL 601741487657524
- Lawrence Yoo, MDSt Charles, IL 601741912167669
- Lori Zimmers, M.D.St Charles, IL 601741588734818
- Massarat Bala, M.D.Schaumburg, IL 601731730196833
Common questions
What is Catherine Sabu Thomas, M.D.'s NPI number?
Catherine Sabu Thomas, M.D.'s National Provider Identifier (NPI) is 1295785756, issued on May 12, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Catherine Sabu Thomas, M.D. located?
The NPPES record lists a practice address at 2570 Foxfield RD, St Charles, IL, 60174. Phone: (630) 584-1950. Providers update this record themselves, so call before visiting.
How can I verify Catherine Sabu Thomas, M.D.'s license?
NPPES lists Illinois license number 036-091979, 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 Catherine Sabu Thomas, M.D. prescribe under Medicare Part D?
In 2024, Catherine Sabu Thomas, M.D. had 11,295 Medicare Part D claims for 854 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Catherine Sabu Thomas, 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.