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ROBERT A MAIRS DO
NPI 1124001862
Obstetrics & Gynecology in Ontario, OR

Active since November 28, 2005PECOS EnrolledAccepts Medicare Assignment
97.58/100
CMS Quality Rating
1050 SW 3RD AVE STE 3200, ONTARIO, OR 97914(541) 881-2325(208) 914-6701 Get Directions Write a Review

NPPES record last updated: September 23, 2025. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: May 29, 2025, Feb 8, 2024, Apr 3, 2019 (3 updates tracked since 2019).

About Robert A Mairs Do NPPES

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

ROBERT A MAIRS DO (NPI 1124001862) is an individual obstetrics & gynecology provider in Ontario, Oregon, licensed in Oregon (DO20644) and active in the NPI registry since November 2005. He is enrolled in Medicare PECOS, is affiliated with Saint Alphonsus Regional Medical Center, and maintains 2 additional practice locations.

NPPES Registry Identity

NPI1124001862
Entity TypeIndividualMale
Primary Taxonomy207V00000X
Provider Legal NameROBERT A MAIRSCredential: DO
Location Address1050 SW 3RD AVE STE 3200Ontario, OR 97914-4560
Mailing AddressPo Box 190930Boise, ID 83719-0930 · (208) 367-5170 · Fax (208) 367-5180
Phone(541) 881-2325
Fax(208) 914-6701
Sole ProprietorNo
Medical School CMSAt Still University Of Health Sciences, College Of Osteo Med, KirksvilleGraduated 1993
Enumeration DateNovember 28, 2005
Last NPPES UpdateSeptember 23, 20253 updates tracked since enumeration
NPPES CertifiedSeptember 23, 2025
✔ NPI 1124001862 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyObstetrics & GynecologyAllopathic & Osteopathic Physicians
Taxonomy Code207V00000X
License✔ Licensed in OR · DO20644
Definition
An obstetrician/gynecologist possesses special knowledge, skills and professional capability in the medical and surgical care of the female reproductive system and associated disorders. This physician serves as a consultant to other physicians and as a primary physician for women.
Also ListedObstetrics & Gynecology · GynecologyTaxonomy 207VG0400X · License O-186 (ID), DO20644 (OR)
1050 SW 3RD AVE STE 3200, Ontario, OR 97914
Open in Google Maps ↗

Secondary Practice Locations 2

Location 19850 W St Lukes Dr Ste 320ANampa, ID 83687-7912 · Phone (208) 706-3220 · Fax (208) 706-3221
Location 2840 SW 4th Ave Ste 105Ontario, OR 97914-2638 · Phone (541) 881-2800 · Fax (541) 881-2825

Other Identifiers 1

Medicaid804163300ID

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include BridgeSpan Health Company, Moda Health Plan, Inc., Molina Healthcare and more.Insurance ›

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

Robert A Mairs Do 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 ID1254303407
PECOS Enrollment IDI20040809001274, I20050404000789
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

5

Medicare enrollment records show Robert Mairs reassigns Medicare billing to 5 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Saint Alphonsus Medical Center- Ontario Inc
Same address
Emergency Medicine
351 SW 9TH ST
Ontario, OR 97914
  • Reassigned Medicare billing, Oregon enrollment
  • 49 clinicians in this Medicare group
NPI 1275852337 (541) 881-7000
Valley Family Health Care, Inc
0.2 mi
Federally Qualified Health Center (FQHC)
840 SW 4TH AVE STE 105
Ontario, OR 97914
  • Reassigned Medicare billing, Oregon and Idaho enrollments
  • Also billed through NPI 1407886484 (Idaho)
  • 51 clinicians in this Medicare group
NPI 1295415032 (541) 889-2668
St Lukes Clinic-Treasure Valley LLC
49 mi
Family Medicine
190 E BANNOCK ST
Boise, ID 83712
  • Reassigned Medicare billing, Idaho enrollment
  • 1,312 clinicians in this Medicare group
NPI 1326336058 (208) 381-2222
Harney District Hospital
108 mi
Multi-Specialty
271 N EGAN AVE
Burns, OR 97720
  • Reassigned Medicare billing, Oregon enrollment
  • 60 clinicians in this Medicare group
NPI 1972113306 (541) 573-7281
Good Shepherd Health Care System
170 mi
Pediatrics
600 NW 11TH ST STE E33
Hermiston, OR 97838
  • Reassigned Medicare billing, Oregon enrollment
  • 344 clinicians in this Medicare group
NPI 1336198159 (541) 667-3740

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

Hospital Affiliations CMS Care Compare 3

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Saint Alphonsus Regional Medical Center

Acute Care Hospitals · Boise, ID
4/5 CMS rating
OwnershipVoluntary non-profit - Church
CMS Certification Number130007
Location1055 North Curtis RoadBoise, ID 83706 · Ada County
Emergency services Birthing friendly

Saint Alphonsus Medical Center - Ontario

Acute Care Hospitals · Ontario, OR
3/5 CMS rating
OwnershipVoluntary non-profit - Church
CMS Certification Number380052
Location351 SW 9th StreetOntario, OR 97914 · Malheur County
Emergency services

Good Shepherd Medical Center

Critical Access Hospitals · Hermiston, OR
3/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number381325
Location610 NW 11th StreetHermiston, OR 97838 · Umatilla County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 97914 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
$126.25 typical visit price
range $54.96 – $166.64
Typical copayment $31.56 (range $13.74 – $41.66)
Most-billed visit code 99204
Established Patient
$68.64 typical visit price
range $17.68 – $136.19
Typical copayment $17.16 (range $4.42 – $34.04)
Most-billed visit code 99213
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.

97.58/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Scored through an Alternative Payment Model
Quality86.53
Promoting Interoperability100
Improvement Activities40

Other Providers at the Same Location NPPES 2

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

STACY LEILANI WHITAKER DO
Obstetrics & Gynecology
1050 SW 3RD AVE STE 3200
ONTARIO, OR 97914
Malheur County (541) 881-2325
SNAKE RIVER PEDIATRICS
Clinic/Center (Rural Health)
1050 SW 3RD AVE STE 3200
ONTARIO, OR 97914
Malheur County (541) 881-2380

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 Robert Mairs's NPI number?

The NPI number for Robert Mairs is 1124001862. It was assigned to this individual provider in the NPPES registry on November 28, 2005.

Where is Robert Mairs located?

Robert Mairs practices at 1050 SW 3rd Ave Ste 3200, Ontario, OR 97914. The listed phone number is (541) 881-2325.

What is Robert Mairs's specialty?

The primary specialty registered for this NPI is Obstetrics & Gynecology with taxonomy code 207V00000X.

Is Robert Mairs enrolled in Medicare?

Yes. Robert Mairs 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 Robert Mairs's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Robert Mairs reassigns Medicare benefits to 5 organizations: Saint Alphonsus Medical Center- Ontario Inc (Ontario, OR), Valley Family Health Care, Inc (Ontario, OR), St Lukes Clinic-Treasure Valley LLC (Boise, ID), Harney District Hospital (Burns, OR) and Good Shepherd Health Care System (Hermiston, OR). 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 Robert Mairs's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Robert Mairs accept?

Health plans from BridgeSpan Health Company, Moda Health Plan, Inc., Molina Healthcare, PacificSource Health Plans and Providence Health Plan and 2 other insurers list Robert Mairs as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

Is Robert Mairs affiliated with any hospitals?

According to CMS data, Robert Mairs is affiliated with Saint Alphonsus Regional Medical Center, Saint Alphonsus Medical Center - Ontario and Good Shepherd Medical Center.

When was this NPI record last updated?

The NPPES record for Robert Mairs was last updated on September 23, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 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.