Dr. Onyema Nnanna, MD
- Medicare services, 2024
- 1,010
- Medicare patients, 2024
- 424
- Part D claims, 2024
- 648
- Hospital affiliations
- 6
- Industry payments
- $2,960
- Practice address
- 3801 South National Avenue, Springfield, MO 65807
- Practice phone
- Call (417) 269-6000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Nnanna's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Onyema Nnanna is a hospitalist in Springfield, Missouri
Dr. Nnanna practices at Cox Medical Center South in Springfield, Missouri, part of Lester E. Cox Medical Centers.
Dr. Nnanna's NPI, 1164872768, was assigned on June 15, 2016. Dr. Nnanna holds Missouri license 2019023516.
- NPI
- 1164872768NPI Registry (opens in a new tab)
- Medicare PAC ID
- 7416224175
- NPI enumeration date
- June 15, 2016
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (417) 269-6000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 43
- Medical school graduation
- 2009
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Onyema Nnanna practices at Cox Medical Center South in Springfield, Missouri
Dr. Nnanna's primary practice is Cox Medical Center South, at 3801 South National Avenue, Springfield, MO 65807 in Greene County. The practice phone is (417) 269-6000.
- Cox Medical Center South3801 South National Avenue, Springfield, MO 65807 · Greene CountyPhone(417) 269-6000
Source: Dmand AI Affiliation Data
Dr. Onyema Nnanna is affiliated with 8 sites of care and 20 medical groups
Dr. Nnanna's primary practice is Cox Medical Center South in Springfield, Missouri, part of Lester E. Cox Medical Centers. Dr. Nnanna is also affiliated with Barnes-Jewish Hospital. The medical group on file is Mercy Clinic Family Medicine - Hollister. Dmand AI also links Dr. Nnanna to 4 more hospitals, 19 medical groups and 2 group practices and clinics, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Onyema Nnanna's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Nnanna practices, 8 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Cox Medical Center South | Available with a free account |
| +7 more sites and 19 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across Lester E. Cox Medical Centers and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Onyema Nnanna is one of 735 hospitalists in Missouri
Hospitalist is Dr. Nnanna's primary specialty in the NPI Registry, under taxonomy code 208M00000X. Dr. Nnanna is licensed in Missouri.
Specialties and state licenses
- Hospitalist, MissouriPrimary
Hospitalists near Dr. Nnanna
Counts of hospitalists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Onyema Nnanna billed Medicare for 1,010 services in 2024
CMS data shows 1,010 Medicare services from Dr. Nnanna across 6 procedure codes in 2024, for 424 Medicare patients. Medicare paid $72,673 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Nnanna's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 1,2282024: 1,01018%
Dr. Nnanna compared with the Missouri median for hospitalists, 2024
- Dr. Nnanna
- Missouri median
- Medicare services
- 1,010vs 4342.3 times
- Medicare patients
- 424vs 1912.2 times
- Part D claims
- 414vs 984.2 times
Medians across 659 hospitalists in Missouri with Dmand AI profiles that report each measure.
Dr. Nnanna's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Onyema Nnanna treated 424 Medicare patients in 2024, average age 76
CMS counts 424 Medicare patients who saw Dr. Nnanna in 2024. The largest group is 75 to 84, with 161 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 29% are also on Medicaid. Their average risk score is 2.15, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Nnanna's median patient age at 70, with 55% women.
Dr. Nnanna's Medicare patients by age, 2024
Dr. Nnanna's Medicare patients by sex, 2024
- Women23856%
- Men18644%
Chronic conditions among Dr. Nnanna's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis63%
- Heart failure49%
- Ischemic heart disease47%
- Atrial fibrillation46%
- COPD46%
- Diabetes46%
Share of Medicare patients with each condition. A patient can have several.
Dr. Nnanna's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 70
Patient panel by sex, all payers
- Women55%
- Men44%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Onyema Nnanna wrote 648 Medicare Part D claims in 2024
In 2024, Dr. Nnanna wrote 648 Medicare Part D claims for 258 patients. 87% of them were for generic drugs. CMS names the drug for 414 of them, across 17 drugs with 11 or more claims each, at $24,802 in total drug cost. In 2023, CMS named 390 claims across 18 drugs.
Dr. Nnanna's Part D claims by kind of drug, 2024
- Generic561 claims87%
- Brand-name and other87 claims13%
Dr. Nnanna's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Nnanna's Part D claims, 2024
- Opioids3%22 of 648 claims
- Antibiotics24%155 of 648 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 3902024: 4146%
Drugs named by CMS: 17 in 2024, 18 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Dr. Onyema Nnanna takes part in Medicare
Dr. Nnanna accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Onyema Nnanna received $2,960 in industry payments from 2016 to 2025
CMS Open Payments shows 55 general payments to Dr. Nnanna from 16 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 100% of the total. Sunovion Pharmaceuticals Inc. paid the most, $334.
General payments to Dr. Nnanna by program year, 2016 to 2025
Companies that paid Dr. Nnanna the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Onyema Nnanna's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Onyema Nnanna
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Onyema Nnanna's NPI number?
Dr. Onyema Nnanna's NPI number is 1164872768. It was assigned on June 15, 2016, and it is active in the NPI Registry.
What kind of doctor is Dr. Onyema Nnanna?
Dr. Onyema Nnanna is a hospitalist in Springfield, Missouri. The primary specialty in the NPI Registry is Hospitalist Physician (taxonomy code 208M00000X).
Where does Dr. Onyema Nnanna practice?
Dr. Nnanna practices at 3801 South National Avenue, Springfield, MO 65807. Dr. Nnanna's primary practice is Cox Medical Center South in Springfield, Missouri, part of Lester E. Cox Medical Centers. Dmand AI also links Dr. Nnanna to 4 hospitals, 19 medical groups and 2 group practices and clinics.
What is Dr. Onyema Nnanna's office phone number?
The practice phone on file for Dr. Nnanna is (417) 269-6000.
What is Dr. Onyema Nnanna's medical license number?
Dr. Nnanna holds Missouri license 2019023516.
Which hospitals is Dr. Onyema Nnanna affiliated with?
Dr. Nnanna practices at Cox Medical Center South in Springfield, Missouri. Dr. Nnanna is also affiliated with Barnes-Jewish Hospital. Dmand AI links Dr. Nnanna to 4 more hospitals.
What medical group is Dr. Onyema Nnanna part of?
Dr. Nnanna is linked to Mercy Clinic Family Medicine - Hollister. Dmand AI links Dr. Nnanna to 19 more medical groups.
Does Dr. Onyema Nnanna accept Medicare?
Yes. CMS data shows Dr. Nnanna billed Medicare for 1,010 services in 2024, and Dr. Nnanna accepts Medicare assignment.
How many Medicare patients does Dr. Onyema Nnanna see?
CMS counts 424 Medicare patients who saw Dr. Nnanna in 2024, with an average age of 76.
What services does Dr. Onyema Nnanna bill to Medicare?
In 2024, Dr. Nnanna's most billed Medicare services were hospital inpatient care (99232), hospital inpatient care (99238) and hospital inpatient care (99233).
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What drugs does Dr. Onyema Nnanna prescribe most?
In 2024 Medicare Part D data, Dr. Nnanna's most prescribed drugs by claims were Levofloxacin, Prednisone and Metoprolol Succinate.
Has Dr. Onyema Nnanna received payments from drug or device companies?
CMS Open Payments shows $2,960 in general payments to Dr. Nnanna from 16 companies from 2016 to 2025. The largest total came from Sunovion Pharmaceuticals Inc.
How long has Dr. Onyema Nnanna been practicing?
Dr. Nnanna graduated from medical school in 2009, 17 years ago.
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