ONYEMA NNANNA (M.D.) – Hospitalist Physician, NPI 1164872768
Hospitalist Physician
Main info
Doctor Profile
Contacts
Profile Insights
NPPES metrics only — not quality of care.
4,186 INTERNAL MEDICINE in MO
Provider Addresses for ONYEMA NNANNA (M.D.)
1101 W Liberty St
Farmington, MO 636401921
Phone: (573) 705-1272
Type: Location
222, South Woods Mill Road, Chesterfield, Saint Louis County, Missouri, 63017, United States
CHESTERFIELD, MO 630173625
Phone: (314) 205-6050
Fax: (314) 434-5939
Type: Mailing
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
Loading prescription activity...
Open Payments (CMS)
No Open Payments data available for this provider.
This can happen when there are no reportable CMS Open Payments records.
Medicare Enrollment & Revalidation
Source: CMS public data · Not endorsed by CMS ·
Educational use only—not medical, billing, or legal advice.
PECOS enrollment status
Participating (accepts Medicare assignment)
Enrollment effective: 2025-01-30
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking 4 Medicare enrollment records; no due dates published yet.
Enrollment records
4
Earliest due date
Not assigned (TBD)
CMS data updated
2026-06-01
Revalidation progress
- Medicare enrolled
- On CMS revalidation list
- Due date assigned
- Revalidate in PECOS
CMS enrollment records
| Enrollment ID | Type | Specialty | State | Due date |
|---|---|---|---|---|
| I20190621000190 | I | Internal Medicine | TX | TBD |
| I20220329001318 | I | Hospitalist | MO | TBD |
| I20230310001319 | I | Hospitalist | IL | TBD |
| I20250130000210 | I | Internal Medicine | OK | TBD |
What to do next
- No action required while the due date shows TBD.
- Check the CMS Revalidation Lookup Tool periodically — CMS updates the list about every 60 days.
- Do not submit a revalidation application in PECOS until CMS publishes a concrete due date.
Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS
Medicare Utilization (FFS)
Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·
Educational use only—not medical, billing, or legal advice.
Top Medicare procedures (2023) · refreshed 2026-05-27
| HCPCS | Description | Services | Beneficiaries | Medicare allowed |
|---|---|---|---|---|
| 99232 | Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 767 | 291 | $0 |
| 99238 | Hospital discharge day management, 30 minutes or less | 114 | 113 | $0 |
| 99233 | Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | 106 | 55 | $0 |
| 99239 | Hospital discharge day management, more than 30 minutes | 92 | 92 | $0 |
| 99223 | Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | 68 | 68 | $0 |
Insurance plans in this area (ZIP 63640)
Loading plans...
Group practice members
| Name | Specialty | State |
|---|---|---|
| Nurse Practitioner | IL | |
| Nurse Practitioner | IL | |
| Family Practice | PR | |
| Nurse Practitioner | IL | |
| Physician Assistant | IL | |
| Nurse Practitioner | IL | |
| Nurse Practitioner | IL |
Reviews
All reviews are moderated before publication. Reviews reflect users' opinions; we do not verify the accuracy of individual reviews.
No reviews yet. Be the first to share your experience — your opinion helps families compare providers.