Onyema Nnanna, M.D.
Hospitalist Physician · Chesterfield, MO
Onyema Nnanna, M.D. is a hospitalist physician with a practice address in Chesterfield, Missouri, and NPI 1164872768, issued on Jun 15, 2016. Check the license (Missouri 2019023516, as entered in NPPES) on the Missouri Board of Registration for the Healing Arts; the Medicare figures below come from public CMS files.
- Name
- Onyema Nnanna
- Credential
- M.D.
- Primary taxonomy
- Hospitalist Physician 208M00000X
- License number
- 2019023516 MO
Self-reported in NPPES; status is on the state search - Practice location
- 222 S Woods Mill RD, Chesterfield, MO 63017
- Phone
- (314) 205-6050
- Enumerated
- Jun 15, 2016
- Record last updated
- Oct 14, 2024
- Fax
- (314) 434-5939
- Medicare enrollment
- Enrolled (PECOS I20220329001318); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest hospitalist physician records → All 930 in Missouri → Look up another NPI →
Also registered at 222 S Woods Mill RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Richard Bell, MDSpecialist1780679373
- John Best, MDPulmonary Disease Physician1053429977
- Ronald Bilchik, M.D.Specialist1992740435
Verify Onyema Nnanna in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMissouri Board of Registration for the Healing Arts
Search for license 2019023516Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
24% more Medicare Part D claims than the average hospitalist physician in 2024
648 Medicare Part D claims for 258 beneficiaries, against an average of 521 among the 21,613 providers of this specialty who prescribed in Part D. 22 claims were for opioids.
Most prescribed
- Levofloxacin40 claims
- Prednisone40 claims
- Metoprolol Succinate38 claims
- Eliquis33 claims
- Furosemide32 claims
- Cefdinir24 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through 3 group practices
- Meds Inpatient Services Associates, IncCentralia, IL
- Midwest Inpatient Anderson Health IncMaryville, IL
- Missouri HB Medical Services LLCPoplar Bluff, MO
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Onyema Nnanna among 930 hospitalist physician records in Missouri
Onyema Nnanna, M.D. is one of 930 hospitalist physician records with a practice address in Missouri. 87% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2016, is newer than 54% of them.
- NPI issued2016 · 54% of these records are older, 41% newer
- In a Medicare fileYes · 87% of these records are
- In the CMS Doctors and Clinicians fileYes · 77% of these records are
- Graduated2009 · median 2014 among the 715 with a school on file
- Record last updated2024 · 25% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208M00000X and a Missouri practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Hospitalist Physician providers in Missouri
There are 930 hospitalist physician records in Missouri.
All 930 in Missouri → Every provider in Chesterfield → Hospitalist Physician nationwide →
The 8 hospitalist physician records with the nearest ZIP codes
- Margaret Kressig, NPChesterfield, MO 630171992362776
- Runa Akter Swity, MDChesterfield, MO 630171992437610
- Ammar Barakat, M.DFestus, MO 630281588994289
- Rita Mukerji, MDFlorissant, MO 630311023218807
- Caroline Nugent, MDWildwood, MO 630401790303493
- Elisabeth Babb, M.D.Bridgeton, MO 630441922071711
- Rebekah Allen, DOSullivan, MO 630801710263033
- Asim Ayaz, M.D.Sullivan, MO 630801144509563
Common questions
What is Onyema Nnanna, M.D.'s NPI number?
Onyema Nnanna, M.D.'s National Provider Identifier (NPI) is 1164872768, issued on Jun 15, 2016. An NPI identifies a provider in billing; it is not a license.
Where is Onyema Nnanna, M.D. located?
The NPPES record lists a practice address at 222 S Woods Mill RD, Chesterfield, MO, 63017. Phone: (314) 205-6050. Providers update this record themselves, so call before visiting.
How can I verify Onyema Nnanna, M.D.'s license?
NPPES lists Missouri license number 2019023516, as entered by the provider. Search the Missouri Board of Registration for the Healing Arts at https://www.fsmb.org/contact-a-state-medical-board/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Onyema Nnanna, M.D. prescribe under Medicare Part D?
In 2024, Onyema Nnanna, M.D. had 648 Medicare Part D claims for 258 beneficiaries; the average among hospitalist physician prescribers was 521. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.