Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Dr. Marisa Leiko Oishi, MD, MPH

Individual provider Emergency Medicine Physician · NPI 1295994739

Dr. Marisa Leiko Oishi, MD, MPH practises Emergency Medicine in Chinle, Arizona. Graduated from Oregon Health Sciences University School of Medicine in 2007, 19 years ago. Practices with Dhhs Phs Naihs Chinle Comprehensive Health Care Facility, a 165-clinician group and accepts Medicare assignment. Licensed in California and Washington.

Years since qualifying
19
Trained at
Oregon Health Sciences University School of Medicine
Licensed in
CA, WA
In the registry since
2008
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.
MPH — Master of Public Health
A graduate degree in population health.

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Practice location Address checks out

US 191 And Hospital Rd
Chinle, AZ 86503
Phone: (928) 674-7090
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Emergency Medicine Physician (primary) Taxonomy 207P00000X · Licence A134104 (CA)
Emergency Medicine Physician Taxonomy 207P00000X (WA)

Record details

NPI number1295994739
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD , MPH
Sole proprietorNo
NPI enumeratedJune 9, 2008
Last updated in NPPESAugust 6, 2026
Certification dateAugust 6, 2026

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyEMERGENCY MEDICINE
Medical schoolOREGON HEALTH SCIENCES UNIVERSITY SCHOOL OF MEDICINE
Graduated 2007 (19 years in practice)
Group practice Dhhs Phs Naihs Chinle Comprehensive Health Care Facility — 165 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients62
Services billed 84 a service is one billed item, such as a visit, a test or a procedure
Average patient age74

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Colleagues at Dhhs Phs Naihs Chinle Comprehensive Health Care Facility

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 165 clinicians in the practice; 12 are shown here.

Other providers in Chinle