DR. KENJI OYASU M.D.
NPI 1487768552
Emergency Medicine in Waukegan, IL
About Dr. Kenji Oyasu M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. KENJI OYASU M.D. (NPI 1487768552) is an individual emergency medicine provider in Waukegan, Illinois, licensed in Indiana (01066275A) and active in the NPI registry since August 2006. He is enrolled in Medicare PECOS, is affiliated with Naples Community Hospital, and maintains a secondary practice location in Park Ridge.
NPPES Registry Identity
Specialties & Licenses 3
Secondary Practice Location 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
Dr. Kenji Oyasu 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
8Medicare enrollment records show Kenji Oyasu reassigns Medicare billing to 8 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Waukegan, IL 60085
- Reassigned Medicare billing, Illinois enrollment
- 166 clinicians in this Medicare group
Chicago, IL 60647
- Reassigned Medicare billing, Illinois enrollment
- 2 clinicians in this Medicare group
Kankakee, IL 60901
- Reassigned Medicare billing, Illinois enrollment
- 61 clinicians in this Medicare group
Corydon, IN 47112
- Reassigned Medicare billing, Indiana enrollment
- 214 clinicians in this Medicare group
Corydon, IN 47112
- Reassigned Medicare billing, Indiana enrollment
- 107 clinicians in this Medicare group
Naples, FL 34102
- Reassigned Medicare billing, Florida enrollment
- 161 clinicians in this Medicare group
Marco Island, FL 34145
- Reassigned Medicare billing, Florida enrollment
- 97 clinicians in this Medicare group
Miami Lakes, FL 33014
- Reassigned Medicare billing, Florida and Illinois enrollments
- 5 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 4
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 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Naples Community Hospital
Acute Care Hospitals · Naples, FLVista Medical Center East
Acute Care Hospitals · Waukegan, ILPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 60085 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.
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 Kenji Oyasu's NPI number?
The NPI number for Kenji Oyasu is 1487768552. It was assigned to this individual provider in the NPPES registry on August 18, 2006.
Where is Kenji Oyasu located?
Kenji Oyasu practices at 1324 N Sheridan Rd Dept Of, Waukegan, IL 60085. The listed phone number is (847) 360-3000.
What is Kenji Oyasu's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Kenji Oyasu enrolled in Medicare?
Yes. Kenji Oyasu 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 Kenji Oyasu's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Kenji Oyasu reassigns Medicare benefits to 8 organizations: Waukegan Clinic Corp (Waukegan, IL), Balanced Flow Medical LLC (Chicago, IL), Riverside Emergency Physicians, LLC (Kankakee, IL), Clarksville Emergency Group, PC (Corydon, IN), Clarksville Physician Services PC (Corydon, IN) and 3 more organizations, listed in the Medicare section above. 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 Kenji Oyasu's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Kenji Oyasu accept?
Health plans from Oscar Health list Kenji Oyasu 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 Kenji Oyasu affiliated with any hospitals?
According to CMS data, Kenji Oyasu is affiliated with Naples Community Hospital and Vista Medical Center East.
When was this NPI record last updated?
The NPPES record for Kenji Oyasu was last updated on March 9, 2020. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 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.
# Dr. Kenji Oyasu, M.D. · NPI 1487768552
Emergency Medicine physician in Waukegan, Illinois. Individual provider, active in the CMS NPPES registry since August 18, 2006.
## Identity
- **NPI:** 1487768552 (Entity type: Individual)
- **Enumerated:** August 18, 2006
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** 01066275A (Indiana)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 1324 N SHERIDAN RD DEPT OF, Waukegan, IL 60085
- **Phone:** (847) 360-3000
## 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:** 8 organizations under Medicare reassignment (form CMS-855R): Waukegan Clinic Corp (NPI 1306937289, Waukegan, IL); Balanced Flow Medical LLC (NPI 1336656701, Chicago, IL); Riverside Emergency Physicians, LLC (NPI 1548969181, Kankakee, IL); Clarksville Emergency Group, PC (NPI 1023487154, Corydon, IN); Clarksville Physician Services PC (NPI 1811629546, Corydon, IN); and 3 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 1993
## Record status
- **NPPES last updated:** March 9, 2020
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Source: [NPI Profile](https://npiprofile.com/npi/1487768552) · Data from the CMS NPPES public registry.