STEPHEN HERBERT KOZLOWSKI M.D.
NPI 1285749390
Internal Medicine - Rheumatology in Crystal Lake, IL
About Stephen Herbert Kozlowski M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
STEPHEN HERBERT KOZLOWSKI M.D. (NPI 1285749390) is an individual rheumatology provider in Crystal Lake, Illinois, licensed in Illinois (036-053309) and active in the NPI registry since August 2006. He is enrolled in Medicare PECOS and maintains a secondary practice location in Sycamore.
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 1
Other Identifiers 3
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Stephen Herbert Kozlowski M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignment
Medicare enrollment records show Stephen Kozlowski reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Rockford, IL 61114
- Reassigned Medicare billing, Illinois enrollment
- 1,375 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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 60014 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
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.
CRYSTAL LAKE, IL 60014
CRYSTAL LAKE, IL 60014
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 Stephen Kozlowski's NPI number?
The NPI number for Stephen Kozlowski is 1285749390. It was assigned to this individual provider in the NPPES registry on August 20, 2006.
Where is Stephen Kozlowski located?
Stephen Kozlowski practices at 360 Station Dr, Crystal Lake, IL 60014. The listed phone number is (815) 338-6600.
What is Stephen Kozlowski's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Rheumatology, with taxonomy code 207RR0500X.
Is Stephen Kozlowski enrolled in Medicare?
Yes. Stephen Kozlowski is registered in the Medicare PECOS enrollment system.
Which organization bills Medicare for Stephen Kozlowski's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Stephen Kozlowski reassigns Medicare benefits to Rockford Health Physicians (Rockford, IL). 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 Stephen Kozlowski's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Stephen Kozlowski was last updated on July 21, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.
# Stephen Herbert Kozlowski, M.D. · NPI 1285749390
Rheumatology physician in Crystal Lake, Illinois. Individual provider, active in the CMS NPPES registry since August 20, 2006.
## Identity
- **NPI:** 1285749390 (Entity type: Individual)
- **Enumerated:** August 20, 2006
- **Primary specialty:** Internal Medicine - Rheumatology · taxonomy 207RR0500X
- **State license:** 036-053309 (Illinois)
- **Sole proprietor:** No
## Practice location
- **Address:** 360 STATION DR, Crystal Lake, IL 60014-7978
- **Phone:** (815) 338-6600
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** Rockford Health Physicians (NPI 1043242886, Rockford, IL), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** July 21, 2022
- **Other identifiers:** Other 0359580001 (IL); Other 01915167 (IL); Other 112318 (IL)
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Source: [NPI Profile](https://npiprofile.com/npi/1285749390) · Data from the CMS NPPES public registry.