ONYEMA NNANNA M.D.
NPI 1164872768
Internal Medicine in Saint Louis, MO
About Onyema Nnanna M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
ONYEMA NNANNA M.D. (NPI 1164872768) is an individual internal medicine provider in Saint Louis, Missouri, licensed in Missouri (2019023516) and active in the NPI registry since June 2016. He is enrolled in Medicare PECOS, is affiliated with Ssm Health St Mary's Hospital -centralia, and is a graduate of Other (2009).
NPPES Registry Identity
Specialties & Licenses 2
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
Onyema Nnanna 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
20Medicare enrollment records show Onyema Nnanna reassigns Medicare billing to 20 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Cahokia Heights, IL 62207
- Reassigned Medicare billing, Illinois enrollment
- 68 clinicians in this Medicare group
Bridgeton, MO 63044
- Reassigned Medicare billing, Missouri enrollment
- 301 clinicians in this Medicare group
Fenton, MO 63026
- Reassigned Medicare billing, Missouri enrollment
- 255 clinicians in this Medicare group
Fenton, MO 63026
- Reassigned Medicare billing, Missouri enrollment
- 93 clinicians in this Medicare group
Maryville, IL 62062
- Reassigned Medicare billing, Illinois enrollment
- 124 clinicians in this Medicare group
Sparta, IL 62286
- Reassigned Medicare billing, Illinois enrollment
- 67 clinicians in this Medicare group
Centralia, IL 62801
- Reassigned Medicare billing, Illinois enrollment
- 21 clinicians in this Medicare group
Cuba, MO 65453
- Reassigned Medicare billing, Missouri enrollment
- 1,487 clinicians in this Medicare group
Jefferson City, MO 65101
- Reassigned Medicare billing, Missouri enrollment
- 93 clinicians in this Medicare group
Poplar Bluff, MO 63901
- Reassigned Medicare billing, Missouri enrollment
- 73 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 6
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 5
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Ssm Health St Mary's Hospital -Centralia
Acute Care Hospitals · Centralia, ILGood Samaritan Regional Hlth Center
Acute Care Hospitals · Mount Vernon, ILAnderson Hospital
Acute Care Hospitals · Maryville, ILBarnes Jewish Hospital
Acute Care Hospitals · Saint Louis, MOPoplar Bluff Regional Medical Center
Acute Care Hospitals · Poplar Bluff, MOPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 63108 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Referred Medical Equipment & Supplies CMS DME claims
Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.
Other Providers at the Same Location NPPES 7
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
SAINT LOUIS, MO 63108
SAINT LOUIS, MO 63108
SAINT LOUIS, MO 63108
SAINT LOUIS, MO 63108
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 Onyema Nnanna's NPI number?
The NPI number for Onyema Nnanna is 1164872768. It was assigned to this individual provider in the NPPES registry on June 15, 2016.
Where is Onyema Nnanna located?
Onyema Nnanna practices at 536 N Taylor Ave, Saint Louis, MO 63108. The listed phone number is (314) 449-1143.
What is Onyema Nnanna's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Onyema Nnanna enrolled in Medicare?
Yes. Onyema Nnanna 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 Onyema Nnanna's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Onyema Nnanna reassigns Medicare benefits to 20 organizations: Touchette Regional Hospital Inc (Cahokia Heights, IL), Sound Physicians Of Illinois, LLC (Bridgeton, MO), Cogent Healthcare Of Missouri, Inc (Fenton, MO), Galen Inpatient Physicians PC. (Fenton, MO), Midwest Inpatient Anderson Health, Inc (Maryville, IL) and 15 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 Onyema Nnanna's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Onyema Nnanna accept?
Health plans from Ambetter Health, Ambetter Health of Delaware, Ambetter from Arkansas Health & Wellness, Ambetter from NH Healthy Families and Ambetter from Sunflower Health Plan and 8 other insurers list Onyema Nnanna 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 Onyema Nnanna affiliated with any hospitals?
According to CMS data, Onyema Nnanna is affiliated with Ssm Health St Mary's Hospital -Centralia, Good Samaritan Regional Hlth Center, Anderson Hospital, Barnes Jewish Hospital and Poplar Bluff Regional Medical Center.
When was this NPI record last updated?
The NPPES record for Onyema Nnanna was last updated on October 9, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 14 days 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.
# Onyema Nnanna, M.D. · NPI 1164872768
Internal Medicine physician in Saint Louis, Missouri. Individual provider, active in the CMS NPPES registry since June 15, 2016.
## Identity
- **NPI:** 1164872768 (Entity type: Individual)
- **Enumerated:** June 15, 2016
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** 2019023516 (Missouri)
- **Sole proprietor:** No
## Practice location
- **Address:** 536 N TAYLOR AVE, Saint Louis, MO 63108-1888
- **Phone:** (314) 449-1143 · **Fax:** (314) 449-1724
## 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:** 20 organizations under Medicare reassignment (form CMS-855R): Touchette Regional Hospital Inc (NPI 1922019926, Cahokia Heights, IL); Sound Physicians Of Illinois, LLC (NPI 1043598865, Bridgeton, MO); Cogent Healthcare Of Missouri, Inc (NPI 1780961599, Fenton, MO); Galen Inpatient Physicians PC. (NPI 1538714688, Fenton, MO); Midwest Inpatient Anderson Health, Inc (NPI 1821758608, Maryville, IL); and 15 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2009
## Record status
- **NPPES last updated:** October 9, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1164872768) · Data from the CMS NPPES public registry.