Quick answers
- Does Timothy J. Oja accept Medicare assignment?
- Yes. Medicare's clinician data says Timothy J. Oja 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 Timothy J. Oja see?
- In 2024, CMS data shows 13 Original Medicare patients and 50 services for Timothy J. Oja. This counts Original Medicare only and measures volume, not quality.
- What is Timothy J. Oja's NPI number?
- 1134787070. 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 Timothy J. Oja, 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 | 13 |
|---|---|
| Services billed to Medicare | 50 |
| Different services or procedures | 5 |
| Participating Medicare provider | Yes |
| Average age of these patients | 61 |
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%
Hospitals where Timothy J. Oja works
Medicare's Facility Affiliation Data lists Timothy J. Oja 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.
- University of Michigan Health - WestWyoming, MI · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 230236
Practice locations
Addresses where Timothy J. Oja is enrolled with Medicare (CMS data updated October 2, 2026).
- 300 68th St SEGrand Rapids, MI 49548 (616) 455‑5000
- 300 68th St SE, Attn Diane FennemaGrand Rapids, MI 49548
- 300 SE 68th StGrand Rapids, MI 49548 (616) 455‑5000
- 7895 Currier Dr, Suite 100Portage, MI 49002 (269) 910‑7327
Group practices
Medicare enrollment lists Timothy J. Oja as a member of this group (CMS data updated October 2, 2026).
- Pine Rest Christian Mental Health Services353 clinicians in the group
Specialties
- Psychiatryprimary
Other psychiatrists in Grand Rapids
Clinicians with the same Medicare primary specialty in Grand Rapids, MI — not a recommendation.
Other clinicians in Pine Rest Christian Mental Health Services
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | DO |
|---|---|
| Medical school | Michigan State University College Of Osteopathic Medicine |
| Graduation year | 2019 (7 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1134787070 |
| 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