THOMAS J BREFELD MD
NPI 1699885871
Internal Medicine in Rockford, IL
About Thomas J Brefeld Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
THOMAS J BREFELD MD (NPI 1699885871) is an individual internal medicine provider in Rockford, Illinois, licensed in Illinois (036104961) and active in the NPI registry since August 2006. He is enrolled in Medicare PECOS, is affiliated with Javon Bea Hospital, and maintains 3 additional practice locations.
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Locations 3
Other Identifiers 1
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Thomas J Brefeld Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
3Medicare enrollment records show Thomas Brefeld reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Rockford, IL 61114
- Reassigned Medicare billing, Illinois enrollment
- 1,375 clinicians in this Medicare group
Harvard, IL 60033
- Reassigned Medicare billing, Illinois enrollment
- 382 clinicians in this Medicare group
Janesville, WI 53548
- Reassigned Medicare billing, Illinois enrollment
- 671 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 2
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Javon Bea Hospital
Acute Care Hospitals · Rockford, ILPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 61114 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Referred Medical Equipment & Supplies CMS DME claims 3
Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
ROCKFORD, IL 61114
ROCKFORD, IL 61114
ROCKFORD, IL 61114
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Thomas Brefeld's NPI number?
The NPI number for Thomas Brefeld is 1699885871. It was assigned to this individual provider in the NPPES registry on August 30, 2006.
Where is Thomas Brefeld located?
Thomas Brefeld practices at 8201 E Riverside Blvd, Rockford, IL 61114. The listed phone number is (815) 971-4066.
What is Thomas Brefeld's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Thomas Brefeld enrolled in Medicare?
Yes. Thomas Brefeld is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Thomas Brefeld's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Thomas Brefeld reassigns Medicare benefits to 3 organizations: Rockford Health Physicians (Rockford, IL), Mercy Harvard Hospital Inc (Harvard, IL) and Mercy Health System Corporation (Janesville, WI). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Thomas Brefeld's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Thomas Brefeld accept?
Health plans from Anthem Blue Cross and Blue Shield list Thomas Brefeld as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is Thomas Brefeld affiliated with any hospitals?
According to CMS data, Thomas Brefeld is affiliated with Javon Bea Hospital.
When was this NPI record last updated?
The NPPES record for Thomas Brefeld was last updated on May 23, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 17 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Thomas J Brefeld, MD · NPI 1699885871
Internal Medicine physician in Rockford, Illinois. Individual provider, active in the CMS NPPES registry since August 30, 2006.
## Identity
- **NPI:** 1699885871 (Entity type: Individual)
- **Enumerated:** August 30, 2006
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** 036104961 (Illinois)
- **Sole proprietor:** No
## Practice location
- **Address:** 8201 E RIVERSIDE BLVD, Rockford, IL 61114-2300
- **Phone:** (815) 971-4066
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 3 organizations under Medicare reassignment (form CMS-855R): Rockford Health Physicians (NPI 1043242886, Rockford, IL); Mercy Harvard Hospital Inc (NPI 1427001445, Harvard, IL); Mercy Health System Corporation (NPI 1598718603, Janesville, WI) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Rush Medical College Of Rush University, class of 1998
## Record status
- **NPPES last updated:** May 23, 2025
- **Other identifiers:** Medicaid 036104961 (IL)
---
Source: [NPI Profile](https://npiprofile.com/npi/1699885871) · Data from the CMS NPPES public registry.