Catherine Tremblay, MD
Family Medicine Physician · Geneva, IL
Catherine Tremblay, MD is a family medicine physician with a practice address in Geneva, Illinois, and NPI 1235715277, issued on Mar 21, 2021. Check the license (Illinois 125078407, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Catherine Tremblay
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 125078407 IL
Self-reported in NPPES; status is on the state search - Practice location
- 300 Randall RD, Geneva, IL 60134
- Phone
- (630) 208-3000
- Enumerated
- Mar 21, 2021
- Record last updated
- Jun 14, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20240801004317); accepts Medicare assignment
- Medical or professional school
- University Of Minnesota Medical School, 2021
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 6,215 in Illinois → Look up another NPI →
Also registered at 300 Randall RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Catherine Tremblay 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 125078407Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
94% fewer Medicare Part D claims than the average family medicine physician in 2024
226 Medicare Part D claims for 60 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 14% of claims.
Most prescribed
- Lisinopril20 claims
- Omeprazole18 claims
- Fluticasone Propionate16 claims
- Metoprolol Succinate11 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
- Group Health Plan IncEagan, MN
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Catherine Tremblay among 6,215 family medicine physician records in Illinois
Catherine Tremblay, MD is one of 6,215 family medicine physician records with a practice address in Illinois. 78% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2021, is newer than 84% of them.
- NPI issued2021 · 84% of these records are older, 13% newer
- In a Medicare fileYes · 78% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated2021 · median 2006 among the 3,714 with a school on file
- Record last updated2021 · 54% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
49 family medicine physician records list a practice address in Geneva
They are 49 of the 1,023 NPPES records with a practice address in Geneva, and 6,215 family medicine physician records in Illinois.
All 6,215 in Illinois → Every provider in Geneva → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Warren Beeh, M.D.Geneva, IL 601341326048612
- Natalie Choi, MDGeneva, IL 601341154375582
- Peter Cladis, M.D.Geneva, IL 601341467452755
- Thomas Eng, D.O.Geneva, IL 601341639277551
- Katherine Fackler-Chapman, M.D.Geneva, IL 601341528068988
- Christopher Fahey, M.D.Geneva, IL 601341306926415
- Michael Fremgen, M.D.Geneva, IL 601341770583072
- Thomas Hazel, M.D.Geneva, IL 601341730189176
Common questions
What is Catherine Tremblay, MD's NPI number?
Catherine Tremblay, MD's National Provider Identifier (NPI) is 1235715277, issued on Mar 21, 2021. An NPI identifies a provider in billing; it is not a license.
Where is Catherine Tremblay, MD located?
The NPPES record lists a practice address at 300 Randall RD, Geneva, IL, 60134. Phone: (630) 208-3000. Providers update this record themselves, so call before visiting.
How can I verify Catherine Tremblay, MD's license?
NPPES lists Illinois license number 125078407, 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 Tremblay, MD prescribe under Medicare Part D?
In 2024, Catherine Tremblay, MD had 226 Medicare Part D claims for 60 beneficiaries; the average among family medicine physician prescribers was 3,544. 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.