Onyema Nnanna, M.D.
NPI 1164872768 · Hospitalist Physician · Chesterfield, MO
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Onyema Nnanna, M.D. is a Hospitalist Physician provider in Chesterfield, MO (NPI 1164872768).
Provider details
- NPI number
- 1164872768
- Entity type
- Individual
- Primary specialty
- Hospitalist PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 2019023516 (MO)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
10 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
1,010 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 543 | $73 |
| Hospital Discharge Day Management, 30 Minutes Or Less99238 | 143 | $75 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 110 | $115 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 107 | $162 |
| Initial Hospital Care With Straightforward Or Low-Level Medical Decision Making, If Using Time, at Least 55 Minutes99222 | 66 | $122 |
| Hospital Discharge Day Management, More Than 30 Minutes99239 | 41 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 17 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Levofloxacin | 40 | 40 |
| Prednisone | 40 | 38 |
| Metoprolol Succinate | 38 | 23 |
| Apixabanbrand: Eliquis | 33 | 19 |
| Furosemide | 32 | 25 |
| Cefdinir | 24 | 23 |
| Clopidogrel Bisulfatebrand: Clopidogrel | 24 | 16 |
Practice location
Mailing address
Additional practice locations (1)
- 1101 W Liberty StFarmington, MO 63640-1921Phone: (573) 705-1272
Registry dates
- Enumerated
- 2016-06-15
- Last updated
- 2024-10-14
- Certified
- 2024-10-14
Frequently asked questions
- What is Onyema Nnanna's NPI number?
- Onyema Nnanna's National Provider Identifier (NPI) is 1164872768, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Onyema Nnanna's specialty?
- Onyema Nnanna is listed in the NPPES registry with a primary specialty of Hospitalist Physician (Allopathic & Osteopathic Physicians).
- Where is Onyema Nnanna located?
- Onyema Nnanna's practice location on file with NPPES is 222 S Woods Mill Rd, Chesterfield, MO 63017-3625.
- What is Onyema Nnanna's phone number?
- The practice phone number listed in the NPPES registry for Onyema Nnanna is (314) 205-6050.
- Does Onyema Nnanna accept Medicare?
- Onyema Nnanna is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Onyema Nnanna's NPI active?
- Yes — Onyema Nnanna's NPI (1164872768) is active in the NPPES registry as of the last update on 2024-10-14.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.