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DR. MARISA LEIKO OISHI MD, MPH
NPI 1295994739
Emergency Medicine in Chinle, AZ

Active since June 09, 2008PECOS EnrolledAccepts Medicare Assignment
84.24/100
CMS Quality Rating
US 191 AND HOSPITAL ROAD, CHINLE, AZ 86503(928) 674-7090 Get Directions Write a Review

NPPES record last updated: August 6, 2026. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Aug 6, 2026, Jul 21, 2022, Jan 25, 2022 and 1 more (4 updates tracked since 2020).

About Dr. Marisa Leiko Oishi Md, Mph NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. MARISA LEIKO OISHI MD, MPH (NPI 1295994739) is an individual emergency medicine provider in Chinle, Arizona, licensed in California (A134104) and active in the NPI registry since June 2008. She is enrolled in Medicare PECOS and is a graduate of Oregon Health Sciences University School Of Medicine (2007).

NPPES Registry Identity

NPI1295994739
Entity TypeIndividualFemale
Primary Taxonomy207P00000X
Provider Legal NameDR. MARISA LEIKO OISHICredential: MD, MPH
Location AddressUS 191 AND HOSPITAL ROADChinle, AZ 86503
Mailing Address12030 Donner Pass RdTruckee, CA 96161-0449 · (503) 358-5156
Phone(928) 674-7090
Sole ProprietorNo
Medical School CMSOregon Health Sciences University School Of MedicineGraduated 2007
Enumeration DateJune 9, 2008
Last NPPES UpdateAugust 6, 20264 updates tracked since enumeration
NPPES CertifiedAugust 6, 2026
✔ NPI 1295994739 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyEmergency MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207P00000X
License✔ Licensed in CA · A134104
Definition
An emergency physician focuses on the immediate decision making and action necessary to prevent death or any further disability both in the pre-hospital setting by directing emergency medical technicians and in the emergency department. The emergency physician provides immediate recognition, evaluation, care, stabilization and disposition of a generally diversified population of adult and pediatric patients in response to acute illness and injury.
US 191 AND HOSPITAL ROAD, Chinle, AZ 86503
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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Marisa Leiko Oishi Md, Mph is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID7618154097
PECOS Enrollment IDI20200723002955
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

2

Medicare enrollment records show Marisa Oishi reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Dhhs Phs Naihs Chinle Comprehensive Health Care Facility
2.9 mi
General Acute Care Hospital
OFF HWY 191 HOSPITAL ROAD
Chinle, AZ 86503
  • Reassigned Medicare billing, Texas enrollment
  • 476 clinicians in this Medicare group
NPI 1508800129 (928) 674-7001
Permanente Medical Group Inc
658 mi
Internal Medicine
7373 WEST LANE
Stockton, CA 95210
  • Reassigned Medicare billing, California enrollment
  • 20,078 clinicians in this Medicare group
NPI 1548343510 (209) 476-2000

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 3

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Emergency department visit with low level of medical decision making 99283
An emergency department visit for a problem of moderate severity involves immediate medical attention for issues like minor fractures, burns, or high fever. The healthcare team will assess your condition, provide necessary treatment, and may suggest further tests or admission if required.
34 services34 patients
Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only 93010
A routine electrocardiogram (ECG) with 12 leads is a simple, non-invasive test that records the electrical activity of your heart. It helps in identifying heart conditions by detecting irregularities in your heart rhythms. The results are interpreted and a report is provided.
21 services21 patients
Emergency department visit with straightforward medical decision making 99282
An emergency department visit for a mild to moderate issue is when you seek immediate medical attention for a non-life-threatening condition. This could include minor injuries, moderate pain, or illnesses like the flu. During the visit, healthcare professionals assess your condition, provide treatment, and may recommend follow-up care.
20 services20 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 86503 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$85.89 typical visit price
range $55.44 – $168.60
Typical copayment $21.47 (range $13.86 – $42.15)
Most-billed visit code 99203
Established Patient
$98.00 typical visit price
range $17.72 – $137.41
Typical copayment $24.50 (range $4.43 – $34.35)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

84.24/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Scored as part of a group practice
Quality64.91
Promoting Interoperability98
Improvement Activities40
Cost67.56

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Marisa Oishi's NPI number?

The NPI number for Marisa Oishi is 1295994739. It was assigned to this individual provider in the NPPES registry on June 9, 2008.

Where is Marisa Oishi located?

Marisa Oishi practices at Us 191 And Hospital Road, Chinle, AZ 86503. The listed phone number is (928) 674-7090.

What is Marisa Oishi's specialty?

The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.

Is Marisa Oishi enrolled in Medicare?

Yes. Marisa Oishi is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organizations bill Medicare for Marisa Oishi's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Marisa Oishi reassigns Medicare benefits to 2 organizations: Dhhs Phs Naihs Chinle Comprehensive Health Care Facility (Chinle, AZ) and Permanente Medical Group Inc (Stockton, CA). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Marisa Oishi's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Marisa Oishi was last updated on August 6, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.