Marisa Leiko Oishi, MD, MPH
Emergency Medicine Physician · Chinle, AZ
Marisa Leiko Oishi, MD, MPH is an emergency medicine physician with a practice address in Chinle, Arizona, and NPI 1295994739, issued on Jun 9, 2008. Check the license on the Arizona Medical Board; the Medicare figures below come from public CMS files.
- Name
- Marisa Leiko Oishi
- Credential
- MD, MPH
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- A134104 CA
Self-reported in NPPES; status is on the state search - Practice location
- US 191 And Hospital Road, Chinle, AZ 86503
- Phone
- (928) 674-7090
- Enumerated
- Jun 9, 2008
- Record last updated
- Aug 6, 2026
- Medicare enrollment
- Enrolled (PECOS I20200723002955); accepts Medicare assignment
- Medical or professional school
- Oregon Health Sciences University School Of Medicine, 2007
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 1,494 in Arizona → Look up another NPI →
Verify Marisa Leiko Oishi in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersArizona Medical BoardCheck the board
- 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
89% fewer Medicare Part D claims than the average emergency medicine physician in 2024
24 Medicare Part D claims for 20 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D.
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The practice group's MIPS final score for 2023 (Medicare payment program): 84.2 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- Dhhs Phs Naihs Chinle Comprehensive Health Care FacilityChinle, AZ
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Marisa Leiko Oishi among 1,494 emergency medicine physician records in Arizona
Marisa Leiko Oishi, MD, MPH is one of 1,494 emergency medicine physician records with a practice address in Arizona. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2008, is newer than 44% of them.
- NPI issued2008 · 44% of these records are older, 52% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 55% of these records are
- Graduated2007 · median 2014 among the 828 with a school on file
- Record last updated2026 · 55% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207P00000X and a Arizona practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
10 emergency medicine physician records list a practice address in Chinle
They are 10 of the 238 NPPES records with a practice address in Chinle, and 1,494 emergency medicine physician records in Arizona.
All 1,494 in Arizona → Every provider in Chinle → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Dimyana Abdelmalek, MDChinle, AZ 865031194012146
- Nasser Bazoun, D.O.Chinle, AZ 865031063944908
- Stephen Coniaris, D.O.Chinle, AZ 865031730270877
- Paul HausknechtChinle, AZ 865031972034940
- Debra Levitt, M.D.Chinle, AZ 865031295857449
- Michelle Ong, MDChinle, AZ 865031699711804
- Kevin Padrez, M.D.Chinle, AZ 865031396130159
- Austin Parish, MDChinle, AZ 865031396242574
Common questions
What is Marisa Leiko Oishi, MD, MPH's NPI number?
Marisa Leiko Oishi, MD, MPH's National Provider Identifier (NPI) is 1295994739, issued on Jun 9, 2008. An NPI identifies a provider in billing; it is not a license.
Where is Marisa Leiko Oishi, MD, MPH located?
The NPPES record lists a practice address at US 191 And Hospital Road, Chinle, AZ, 86503. Phone: (928) 674-7090. Providers update this record themselves, so call before visiting.
How can I verify Marisa Leiko Oishi, MD, MPH's license?
Search the Arizona Medical Board at https://www.azmd.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Marisa Leiko Oishi, MD, MPH prescribe under Medicare Part D?
In 2024, Marisa Leiko Oishi, MD, MPH had 24 Medicare Part D claims for 20 beneficiaries; the average among emergency medicine physician prescribers was 226. Part D covers Medicare prescriptions only.
What is Marisa Leiko Oishi, MD, MPH's MIPS final score?
The 2023 MIPS final score is 84.2 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.