Quick answers
- Does Ogonna I. Onyeje accept Medicare assignment?
- Yes. Medicare's clinician data says Ogonna I. Onyeje accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Ogonna I. Onyeje see?
- In 2024, CMS data shows 179 Original Medicare patients and 196 services for Ogonna I. Onyeje. This counts Original Medicare only and measures volume, not quality.
- What is Ogonna I. Onyeje's NPI number?
- 1508944000. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Ogonna I. Onyeje, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 179 |
|---|---|
| Services billed to Medicare | 196 |
| Different services or procedures | 7 |
| Participating Medicare provider | Yes |
| Average age of these patients | 76 |
Most frequent services
- Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)116 services
- Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)57 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High blood pressure75%
- High cholesterol75%
- Diabetes61%
- Chronic kidney disease54%
- Heart failure54%
- Arthritis50%
Hospitals where Ogonna I. Onyeje works
Medicare's Facility Affiliation Data lists Ogonna I. Onyeje at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Mercy Medical CenterMerced, CA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 050444
- Saint Agnes Medical CenterFresno, CA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 050093
Practice locations
Addresses where Ogonna I. Onyeje is enrolled with Medicare (CMS data updated October 2, 2026).
- 1303 E Herndon AveFresno, CA 93720 (559) 450‑3000
- 333 Mercy AveMerced, CA 95340 (209) 564‑5000
Group practices
Medicare enrollment lists Ogonna I. Onyeje as a member of these groups (CMS data updated October 2, 2026).
- Galen Inpatient Physicians PC1,077 clinicians in the group
- Merced Hospitalist Medical Group Inc38 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Fresno
Clinicians with the same Medicare primary specialty in Fresno, CA — not a recommendation.
Other clinicians in Galen Inpatient Physicians PC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1999 (27 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1508944000 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians