Quick answers
- Does James Oyeniyi accept Medicare assignment?
- Yes. Medicare's clinician data says James Oyeniyi 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.
- What is James Oyeniyi's NPI number?
- 1144670936. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where James Oyeniyi works
Medicare's Facility Affiliation Data lists James Oyeniyi 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.
- HCA Houston Healthcare SoutheastPasadena, TX · Acute Care Hospital · Medicare rating: 3 of 5 stars · CCN 450097
- Houston Methodist Willowbrook HospitalHouston, TX · Acute Care Hospital · Medicare rating: 5 of 5 stars · CCN 450844
Practice locations
Addresses where James Oyeniyi is enrolled with Medicare (CMS data updated October 2, 2026).
- 6445 Main St, Suite 2500Houston, TX 77030 (713) 441‑3150
Group practices
Medicare enrollment lists James Oyeniyi as a member of this group (CMS data updated October 2, 2026).
- Houston Methodist Specialty Physicians1,528 clinicians in the group
Specialties
- Vascular Surgeryprimary
Other vascular surgeons in Houston
Clinicians with the same Medicare primary specialty in Houston, TX — not a recommendation.
Other clinicians in Houston Methodist Specialty Physicians
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2016 (10 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1144670936 |
| 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
- 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