Quick answers
- Does Marisa L. Oishi accept Medicare assignment?
- Yes. Medicare's clinician data says Marisa L. 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 Marisa L. Oishi see?
- In 2024, CMS data shows 62 Original Medicare patients and 84 services for Marisa L. Oishi. This counts Original Medicare only and measures volume, not quality.
- What is Marisa L. Oishi's NPI number?
- 1295994739. 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 Marisa L. 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 | 62 |
|---|---|
| Services billed to Medicare | 84 |
| Different services or procedures | 6 |
| Participating Medicare provider | Yes |
| Average age of these patients | 74 |
Most frequent services
- Emergency department visit with low level of medical decision making (99283)34 services
- Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only (93010)21 services
- Emergency department visit with straightforward medical decision making (99282)20 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 pressure66%
- Diabetes52%
- High cholesterol42%
- Arthritis42%
- Ischemic heart disease21%
- Heart failure21%
Practice locations
Addresses where Marisa L. Oishi is enrolled with Medicare (CMS data updated October 2, 2026).
- Highway 191 and Hospital RdChinle, AZ 86503
Group practices
Medicare enrollment lists Marisa L. Oishi as a member of this group (CMS data updated October 2, 2026).
- DHHS PHS Naihs Chinle Comprehensive Health Care Facility152 clinicians in the group
Specialties
- Emergency Medicineprimary
Other emergency medicine doctors in Chinle
Clinicians with the same Medicare primary specialty in Chinle, AZ — not a recommendation.
Other clinicians in DHHS PHS Naihs Chinle Comprehensive Health Care Facility
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Oregon Health Sciences University School Of Medicine |
| Graduation year | 2007 (19 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1295994739 |
| 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
- 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