DR. MARY A DEAN ONAYEMI MD
NPI 1770518169
Obstetrics & Gynecology in Chicago, IL
About Dr. Mary A Dean Onayemi Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. MARY A DEAN ONAYEMI MD (NPI 1770518169) is an individual obstetrics & gynecology provider in Chicago, Illinois, licensed in Illinois (036065557) and active in the NPI registry since July 2006. She is enrolled in Medicare PECOS, maintains a secondary practice location in Chicago, and is a graduate of University Of Illinois College Of Med (chi/peor/rock/chm-urb) (1980).
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
Dr. Mary A Dean Onayemi 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 Reassignments
2Medicare enrollment records show Mary Dean Onayemi reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Chicago, IL 60628
- Reassigned Medicare billing, Illinois enrollment
- 41 clinicians in this Medicare group
Oak Lawn, IL 60453
- Reassigned Medicare billing, Illinois enrollment
- Medicare enrollment name: Advocate Health And Hospitals Corporation
- 4,870 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 60643 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 17
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
CHICAGO, IL 60643
CHICAGO, IL 60643
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 Mary Dean Onayemi's NPI number?
The NPI number for Mary Dean Onayemi is 1770518169. It was assigned to this individual provider in the NPPES registry on July 12, 2006.
Where is Mary Dean Onayemi located?
Mary Dean Onayemi practices at 1701 W Monterey Ave Suite 11, Chicago, IL 60643. The listed phone number is (773) 238-2282.
What is Mary Dean Onayemi's specialty?
The primary specialty registered for this NPI is Obstetrics & Gynecology with taxonomy code 207V00000X.
Is Mary Dean Onayemi enrolled in Medicare?
Yes. Mary Dean Onayemi 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 Mary Dean Onayemi's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mary Dean Onayemi reassigns Medicare benefits to 2 organizations: Chicago Family Health Center, Inc. (Chicago, IL) and Advocate Health & Hospitals Corporation (Oak Lawn, 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 Mary Dean Onayemi's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Mary Dean Onayemi accept?
Health plans from Ambetter Health and Ambetter Health of Delaware list Mary Dean Onayemi 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.
When was this NPI record last updated?
The NPPES record for Mary Dean Onayemi was last updated on August 9, 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.
# Dr. Mary A Dean Onayemi, MD · NPI 1770518169
Obstetrics & Gynecology physician in Chicago, Illinois. Individual provider, active in the CMS NPPES registry since July 12, 2006.
## Identity
- **NPI:** 1770518169 (Entity type: Individual)
- **Enumerated:** July 12, 2006
- **Primary specialty:** Obstetrics & Gynecology · taxonomy 207V00000X
- **State license:** 036065557 (Illinois)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 1701 W MONTEREY AVE, SUITE 11, Chicago, IL 60643-4257
- **Phone:** (773) 238-2282 · **Fax:** (773) 238-5746
## 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:** 2 organizations under Medicare reassignment (form CMS-855R): Chicago Family Health Center, Inc. (NPI 1770785644, Chicago, IL); Advocate Health & Hospitals Corporation (NPI 1912936014, Oak Lawn, IL) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Illinois College Of Med, class of 1980
## Record status
- **NPPES last updated:** August 9, 2022
- **Other identifiers:** Other 036065557 (IL)
---
Source: [NPI Profile](https://npiprofile.com/npi/1770518169) · Data from the CMS NPPES public registry.