RONALD J OCONER D.O.
NPI 1649473729
Anesthesiology in Harvard, IL
About Ronald J Oconer D.o. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
RONALD J OCONER D.O. (NPI 1649473729) is an individual anesthesiology provider in Harvard, Illinois, licensed in Illinois (036.122284) and active in the NPI registry since June 2007. He is enrolled in Medicare PECOS, is affiliated with Northwestern Medicine Mchenry, and maintains 2 additional practice locations.
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Locations 2
Other Identifiers 10
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
Ronald J Oconer D.o. 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
15Medicare enrollment records show Ronald Oconer reassigns Medicare billing to 15 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Harvard, IL 60033
- Reassigned Medicare billing, Illinois enrollment
- 382 clinicians in this Medicare group
Woodstock, IL 60098
- Reassigned Medicare billing, Illinois enrollment
- 87 clinicians in this Medicare group
Huntley, IL 60142
- Reassigned Medicare billing, Illinois enrollment
- 70 clinicians in this Medicare group
Rockford, IL 61107
- Reassigned Medicare billing, Illinois enrollment
- 562 clinicians in this Medicare group
Janesville, WI 53548
- Reassigned Medicare billing, Illinois and Wisconsin enrollments
- 671 clinicians in this Medicare group
Carol Stream, IL 60122
- Reassigned Medicare billing, Illinois enrollment
- 4,817 clinicians in this Medicare group
Pleasant Prairie, WI 53158
- Reassigned Medicare billing, Wisconsin enrollment
- 210 clinicians in this Medicare group
Rochelle, IL 61068
- Reassigned Medicare billing, Illinois enrollment
- 55 clinicians in this Medicare group
Park Ridge, IL 60068
- Reassigned Medicare billing, Illinois enrollment
- 42 clinicians in this Medicare group
Park Ridge, IL 60068
- Reassigned Medicare billing, Wisconsin enrollment
- 23 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 3
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.
Northwestern Medicine Mchenry
Acute Care Hospitals · Mchenry, ILThe Monroe Clinic
Acute Care Hospitals · Monroe, WIOther Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
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 Ronald Oconer's NPI number?
The NPI number for Ronald Oconer is 1649473729. It was assigned to this individual provider in the NPPES registry on June 7, 2007.
Where is Ronald Oconer located?
Ronald Oconer practices at 901 Grant St, Harvard, IL 60033. The listed phone number is (815) 943-8094.
What is Ronald Oconer's specialty?
The primary specialty registered for this NPI is Anesthesiology with taxonomy code 207L00000X.
Is Ronald Oconer enrolled in Medicare?
Yes. Ronald Oconer 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 Ronald Oconer's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Ronald Oconer reassigns Medicare benefits to 15 organizations: Mercy Harvard Hospital Inc (Harvard, IL), Town Square Anesthesia LLC (Woodstock, IL), Huntley Anesthesia Associates LLC (Huntley, IL), Orthomidwest, PLLC (Rockford, IL), Mercy Health System Corporation (Janesville, WI) and 10 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 Ronald Oconer's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Ronald Oconer affiliated with any hospitals?
According to CMS data, Ronald Oconer is affiliated with Northwestern Medicine Mchenry and The Monroe Clinic.
When was this NPI record last updated?
The NPPES record for Ronald Oconer was last updated on May 6, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 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.
# Ronald J Oconer, D.O. · NPI 1649473729
Anesthesiology physician in Harvard, Illinois. Individual provider, active in the CMS NPPES registry since June 7, 2007.
## Identity
- **NPI:** 1649473729 (Entity type: Individual)
- **Enumerated:** June 7, 2007
- **Primary specialty:** Anesthesiology · taxonomy 207L00000X
- **State license:** 036.122284 (Illinois)
- **Sole proprietor:** No
## Practice location
- **Address:** 901 GRANT ST, Harvard, IL 60033-1821
- **Phone:** (815) 943-8094 · **Fax:** (815) 943-8645
## 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:** 15 organizations under Medicare reassignment (form CMS-855R): Mercy Harvard Hospital Inc (NPI 1427001445, Harvard, IL); Town Square Anesthesia LLC (NPI 1669471017, Woodstock, IL); Huntley Anesthesia Associates LLC (NPI 1205282019, Huntley, IL); Orthomidwest, PLLC (NPI 1730136474, Rockford, IL); Mercy Health System Corporation (NPI 1598718603, Janesville, WI); and 10 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Midwestern University, Chicago College Of Osteopathic Med, class of 2003
## Record status
- **NPPES last updated:** May 6, 2026
- **Other identifiers:** Other 30042806 (PA); Other 30563 (PA); Other 30042806 (PA); and 7 more
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Source: [NPI Profile](https://npiprofile.com/npi/1649473729) · Data from the CMS NPPES public registry.