DIANE SIERENS M.D.
NPI 1831127802
Neurological Surgery in Rockford, IL
About Diane Sierens M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DIANE SIERENS M.D. (NPI 1831127802) is an individual neurological surgery provider in Rockford, Illinois, licensed in Illinois (036102651) and active in the NPI registry since June 2006. She is enrolled in Medicare PECOS, is affiliated with John H Stroger Jr Hospital, and maintains a secondary practice location in Carbondale.
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 1
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
Diane Sierens M.d. 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
2Medicare enrollment records show Diane Sierens reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Arlington Heights, IL 60004
- Reassigned Medicare billing, Illinois enrollment
- 1,047 clinicians in this Medicare group
Carbondale, IL 62901
- Reassigned Medicare billing, Illinois enrollment
- 702 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
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.
John H Stroger Jr Hospital
Acute Care Hospitals · Chicago, ILMemorial Hospital Of Carbondale
Acute Care Hospitals · Carbondale, ILFranciscan Health Olympia & Chicago Heights
Acute Care Hospitals · Olympia Fields, ILPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 61103 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
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 61103
ROCKFORD, IL 61103
ROCKFORD, IL 61103
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 Diane Sierens's NPI number?
The NPI number for Diane Sierens is 1831127802. It was assigned to this individual provider in the NPPES registry on June 29, 2006.
Where is Diane Sierens located?
Diane Sierens practices at 2350 N Rockton Ave, Rockford, IL 61103. The listed phone number is (815) 971-7600.
What is Diane Sierens's specialty?
The primary specialty registered for this NPI is Neurological Surgery with taxonomy code 207T00000X.
Is Diane Sierens enrolled in Medicare?
Yes. Diane Sierens 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 Diane Sierens's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Diane Sierens reassigns Medicare benefits to 2 organizations: Cook County (Arlington Heights, IL) and Southern Illinois Medical Services, Nfp (Carbondale, IL). 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 Diane Sierens's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Diane Sierens accept?
Health plans from Ambetter Health and Ambetter Health of Delaware list Diane Sierens 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 Diane Sierens affiliated with any hospitals?
According to CMS data, Diane Sierens is affiliated with John H Stroger Jr Hospital, Memorial Hospital Of Carbondale and Franciscan Health Olympia & Chicago Heights.
When was this NPI record last updated?
The NPPES record for Diane Sierens was last updated on March 6, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 7 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.