Quick answers
- Does Tatsuya Oishi accept Medicare assignment?
- Yes. Medicare's clinician data says Tatsuya Oishi 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 Tatsuya Oishi see?
- In 2024, CMS data shows 309 Original Medicare patients and 2,147 services for Tatsuya Oishi. This counts Original Medicare only and measures volume, not quality.
- What is Tatsuya Oishi's NPI number?
- 1447645668. 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 Tatsuya Oishi, 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 | 309 |
|---|---|
| Services billed to Medicare | 2,147 |
| Different services or procedures | 32 |
| Participating Medicare provider | Yes |
| Average age of these patients | 72 |
Most frequent services
- Continuous intraoperative neurophysiology monitoring, from outside the operating room (remote or nearby), per patient, (attention directed exclusively to one patient) each 15 minutes (list in addition to primary procedure) (G0453)1,232 services
- Placement of skin electrodes and measurement of stimulated sites on arms and legs (95938)121 services
- Needle measurement of electrical activity in arm or leg muscles, complete study (95886)115 services
- Needle measurement of electrical activity in arm, leg, trunk or head muscles, limited study (95870)114 services
- Placement of skin electrodes and measurement of central motor stimulation in arms and legs (95939)112 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 cholesterol75%
- High blood pressure74%
- Arthritis68%
- Diabetes33%
- Ischemic heart disease30%
- Chronic kidney disease29%
Hospitals where Tatsuya Oishi works
Medicare's Facility Affiliation Data lists Tatsuya Oishi 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.
- Mayo Clinic Hospital RochesterRochester, MN · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 240010
Practice locations
Addresses where Tatsuya Oishi is enrolled with Medicare (CMS data updated October 2, 2026).
- 1216 2nd St SWRochester, MN 55902 (507) 255‑5123
- 200 1st St SWRochester, MN 55905
- 201 W Ctr StRochester, MN 55902 (507) 255‑5123
Group practices
Medicare enrollment lists Tatsuya Oishi as a member of this group (CMS data updated October 2, 2026).
- Mayo Clinic4,956 clinicians in the group
Specialties
- Neurologyprimary
Other neurologists in Rochester
Clinicians with the same Medicare primary specialty in Rochester, MN — not a recommendation.
Other clinicians in Mayo Clinic
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2015 (11 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1447645668 |
| 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