JAROSLAW P SIWIK MD
NPI 1043280522
Internal Medicine in Portage, MI
About Jaroslaw P Siwik Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
JAROSLAW P SIWIK MD (NPI 1043280522) is an individual internal medicine provider in Portage, Michigan, licensed in Michigan (4301070284) and active in the NPI registry since January 2006. He is enrolled in Medicare PECOS, is affiliated with Bronson Methodist Hospital, and is a graduate of Wayne State University School Of Medicine (1997).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 2
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
Jaroslaw P Siwik 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 Reassignment
Medicare enrollment records show Jaroslaw Siwik reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Kalamazoo, MI 49007
- Reassigned Medicare billing, Michigan enrollment
- 1,133 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 5
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 3
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Bronson Methodist Hospital
Acute Care Hospitals · Kalamazoo, MIBronson Battle Creek Hospital
Acute Care Hospitals · Battle Creek, MIBronson Lakeview Hospital
Critical Access Hospitals · Paw Paw, MIPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 49024 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 13
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
PORTAGE, MI 49024
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 Jaroslaw Siwik's NPI number?
The NPI number for Jaroslaw Siwik is 1043280522. It was assigned to this individual provider in the NPPES registry on January 25, 2006.
Where is Jaroslaw Siwik located?
Jaroslaw Siwik practices at 2600 W Centre Ave Bronson Internal Medicine Associates, Portage, MI 49024. The listed phone number is (269) 324-4141.
What is Jaroslaw Siwik's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Jaroslaw Siwik enrolled in Medicare?
Yes. Jaroslaw Siwik 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 organization bills Medicare for Jaroslaw Siwik's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Jaroslaw Siwik reassigns Medicare benefits to Bronson Methodist Hospital (Kalamazoo, MI). The 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 Jaroslaw Siwik's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Jaroslaw Siwik accept?
Health plans from Blue Care Network of Michigan, Blue Cross Blue Shield of Michigan Mutual Insurance Company and Priority Health list Jaroslaw Siwik 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 Jaroslaw Siwik affiliated with any hospitals?
According to CMS data, Jaroslaw Siwik is affiliated with Bronson Methodist Hospital, Bronson Battle Creek Hospital and Bronson Lakeview Hospital.
When was this NPI record last updated?
The NPPES record for Jaroslaw Siwik was last updated on November 27, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 years 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.
# Jaroslaw P Siwik, MD · NPI 1043280522
Internal Medicine physician in Portage, Michigan. Individual provider, active in the CMS NPPES registry since January 25, 2006.
## Identity
- **NPI:** 1043280522 (Entity type: Individual)
- **Enumerated:** January 25, 2006
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** 4301070284 (Michigan)
- **Sole proprietor:** No
## Practice location
- **Address:** 2600 W CENTRE AVE, BRONSON INTERNAL MEDICINE ASSOCIATES, Portage, MI 49024-4828
- **Phone:** (269) 324-4141 · **Fax:** (269) 324-2020
## 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:** Bronson Methodist Hospital (NPI 1417961137, Kalamazoo, MI), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Wayne State University School Of Medicine, class of 1997
## Record status
- **NPPES last updated:** November 27, 2023
- **Other identifiers:** Medicaid 4616530 (MI); Other CA4396 (MI)
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Source: [NPI Profile](https://npiprofile.com/npi/1043280522) · Data from the CMS NPPES public registry.