ZACHARY MARK WORKING MD
NPI 1790051084
Orthopaedic Surgery - Orthopaedic Trauma in Portland, OR
About Zachary Mark Working Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
ZACHARY MARK WORKING MD (NPI 1790051084) is an individual orthopaedic trauma provider in Portland, Oregon, licensed in Oregon (MD188610) and active in the NPI registry since March 2012. He is enrolled in Medicare PECOS, is affiliated with Ohsu Hospital And Clinics, and maintains 2 additional practice locations.
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Locations 2
Accepted 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
Zachary Mark Working Md 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.
Medicare Billing Reassignment
Medicare enrollment records show Zachary Working reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Portland, OR 97239
- Reassigned Medicare billing, Oregon enrollment
- 2,212 clinicians in this Medicare group
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.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Ohsu Hospital And Clinics
Acute Care Hospitals · Portland, ORMedicare 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.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
PORTLAND, OR 97239
PORTLAND, OR 97239
PORTLAND, OR 97239
PORTLAND, OR 97239
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 Zachary Working's NPI number?
The NPI number for Zachary Working is 1790051084. It was assigned to this individual provider in the NPPES registry on March 30, 2012.
Where is Zachary Working located?
Zachary Working practices at 3181 SW Sam Jackson Park Rd, Portland, OR 97239. The listed phone number is (503) 494-6400.
What is Zachary Working's specialty?
The primary specialty registered for this NPI is Orthopaedic Surgery, specializing in Orthopaedic Trauma, with taxonomy code 207XX0801X.
Is Zachary Working enrolled in Medicare?
Yes. Zachary Working 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 organization bills Medicare for Zachary Working's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Zachary Working reassigns Medicare benefits to University Professional Services (Portland, OR). The 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 Zachary Working's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Zachary Working accept?
Health plans from Moda Health Plan, Inc., PacificSource Health Plans and Providence Health Plan list Zachary Working 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 Zachary Working affiliated with any hospitals?
According to CMS data, Zachary Working is affiliated with Ohsu Hospital And Clinics.
When was this NPI record last updated?
The NPPES record for Zachary Working was last updated on August 21, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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.
# Zachary Mark Working, MD · NPI 1790051084
Orthopaedic Trauma physician in Portland, Oregon. Individual provider, active in the CMS NPPES registry since March 30, 2012.
## Identity
- **NPI:** 1790051084 (Entity type: Individual)
- **Enumerated:** March 30, 2012
- **Primary specialty:** Orthopaedic Surgery - Orthopaedic Trauma · taxonomy 207XX0801X
- **State license:** MD188610 (Oregon)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 3181 SW SAM JACKSON PARK RD, Portland, OR 97239-3011
- **Phone:** (503) 494-6400
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** University Professional Services (NPI 1376709535, Portland, OR), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Pittsburgh School Of Medicine, class of 2012
## Record status
- **NPPES last updated:** August 21, 2024
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Source: [NPI Profile](https://npiprofile.com/npi/1790051084) · Data from the CMS NPPES public registry.