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OSCAR JOHN MA MD
NPI 1508828112
Emergency Medicine in Portland, OR

Active since April 06, 2006PECOS Enrolled
3181 SW SAM JACKSON PARK ROAD, OHSU, DEPARTMENT OF EMERGENCY MEDICINE, CDW-EM, PORTLAND, OR 97239(503) 494-7008(503) 494-4997 Get Directions Write a Review

NPPES record last updated: August 10, 2007. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About Oscar John Ma Md NPPES

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

OSCAR JOHN MA MD (NPI 1508828112) is an individual emergency medicine provider in Portland, Oregon, licensed in Oregon (MD27108) and active in the NPI registry since April 2006. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1508828112
Entity TypeIndividualMale
Primary Taxonomy207P00000X
Provider Legal NameOSCAR JOHN MACredential: MD
Location Address3181 SW SAM JACKSON PARK ROAD, OHSU, DEPARTMENT OF EMERGENCY MEDICINE, CDW-EMPortland, OR 97239-3098
Mailing Address3181 Sw Sam Jackson Park Rd, Dept Of Emergency Medicine, Cdw-emPortland, OR 97239-3011 · (503) 494-7008 · Fax (503) 494-4997
Phone(503) 494-7008
Fax(503) 494-4997
Sole ProprietorNo
Enumeration DateApril 6, 2006
Last NPPES UpdateAugust 10, 2007
✔ NPI 1508828112 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyEmergency MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207P00000X
License✔ Licensed in OR · MD27108
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.
3181 SW SAM JACKSON PARK ROAD, OHSU, Portland, OR 97239
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Other Identifiers 2

Medicare UPINF48738MO
Medicare ID-Type Unspecified2639931AMO · Medicare Number

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Oscar John Ma Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

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 Oscar Ma reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Global Physician Network LLC Series I
2,529 mi
Emergency Medicine
1700 S TAMIAMI TRL
Sarasota, FL 34239
  • Reassigned Medicare billing, Florida enrollment
  • 112 clinicians in this Medicare group
NPI 1316467525 (941) 917-9000
Inphynet Contracting Services LLC
2,681 mi
Emergency Medicine
5352 LINTON BLVD
Delray Beach, FL 33484
  • Reassigned Medicare billing, Florida enrollment
  • 527 clinicians in this Medicare group
NPI 1073556767 (561) 495-3115

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

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 97239 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
$90.51 typical visit price
range $58.99 – $176.88
Typical copayment $22.62 (range $14.74 – $44.22)
Most-billed visit code 99203
Established Patient
$103.51 typical visit price
range $19.32 – $144.79
Typical copayment $25.87 (range $4.83 – $36.19)
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.

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 Oscar Ma's NPI number?

The NPI number for Oscar Ma is 1508828112. It was assigned to this individual provider in the NPPES registry on April 6, 2006.

Where is Oscar Ma located?

Oscar Ma practices at 3181 SW Sam Jackson Park Road, Ohsu Department Of Emergency Medicine, Cdw-Em, Portland, OR 97239. The listed phone number is (503) 494-7008.

What is Oscar Ma's specialty?

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

Is Oscar Ma enrolled in Medicare?

Yes. Oscar Ma is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for Oscar Ma's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Oscar Ma reassigns Medicare benefits to 2 organizations: Global Physician Network LLC Series I (Sarasota, FL) and Inphynet Contracting Services LLC (Delray Beach, FL). 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 Oscar Ma'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 Oscar Ma was last updated on August 10, 2007. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 19 years 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.