Thomas J. Brefeld, MD
Internal Medicine Physician · Rockford, IL
Thomas J. Brefeld, MD is an internal medicine physician with a practice address in Rockford, Illinois, and NPI 1699885871, issued on Aug 30, 2006. Check the license (Illinois 036104961, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Thomas J. Brefeld
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 036104961 IL
Self-reported in NPPES; status is on the state search - Practice location
- 8201 E Riverside Blvd, Rockford, IL 61114
- Phone
- (815) 971-4066
- Enumerated
- Aug 30, 2006
- Record last updated
- May 23, 2025
- Medicaid ID
- 036104961 IL
- Medicare enrollment
- Enrolled (PECOS I20050108000086); accepts Medicare assignment
- Medical or professional school
- Rush Medical College Of Rush University, 1998
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 7,238 in Illinois → Look up another NPI →
Also registered at 8201 E Riverside Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Stephen Ackah, FNP-BCNurse Practitioner1619724424
- Jennifer AgboStudent in an Organized Health Care Education/Training Program1760237796
- Shaheen AhmedInternal Medicine Physician1447045562
- Bassam Al-Joundi, MDCardiovascular Disease Physician1144277534
- Cameron Allen, DOEmergency Medicine Physician1922685999
- Swapna Aradhyula, MD, MRCGPHospitalist Physician1659688588
Verify Thomas J. Brefeld 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 036104961Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
95% fewer Medicare Part D claims than the average internal medicine physician in 2024
165 Medicare Part D claims for 80 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 10% of claims. 16 claims were for opioids.
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.
Industry payments in 2024: $10,812.03
18 payments; by number, the most common kind was food and beverage; the largest payer was Xeris Pharmaceuticals, Inc. The 50,334 providers of this specialty with any payment received $1,303.06 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Rockford Health PhysiciansRockford, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Thomas J. Brefeld among 7,238 internal medicine physician records in Illinois
Thomas J. Brefeld, MD 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
- Graduated1998 · 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).
82 internal medicine physician records list a practice address in Rockford
They are 82 of the 3,893 NPPES records with a practice address in Rockford, and 7,238 internal medicine physician records in Illinois.
All 7,238 in Illinois → Every provider in Rockford → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Humaira Bari, MDRockford, IL 611141497845135
- Daniel Chamberlain, MDRockford, IL 611141396833307
- Aaron Coates, MDRockford, IL 611141871603050
- Venkata Dontaraju, M.D, MRCPRockford, IL 611141821241084
- Daniel Herdeman, MDRockford, IL 611141447293451
- Willard Moore, MDRockford, IL 611141831209022
- Peter Phelan, MDRockford, IL 611141548358534
- Linda Razbadouski, M.D.Rockford, IL 611141538194154
Common questions
What is Thomas J. Brefeld, MD's NPI number?
Thomas J. Brefeld, MD's National Provider Identifier (NPI) is 1699885871, issued on Aug 30, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Thomas J. Brefeld, MD located?
The NPPES record lists a practice address at 8201 E Riverside Blvd, Rockford, IL, 61114. Phone: (815) 971-4066. Providers update this record themselves, so call before visiting.
How can I verify Thomas J. Brefeld, MD's license?
NPPES lists Illinois license number 036104961, 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 J. Brefeld, MD prescribe under Medicare Part D?
In 2024, Thomas J. Brefeld, MD had 165 Medicare Part D claims for 80 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.