Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Zachary Mark Working, MD

Individual provider Orthopaedic Surgery Physician · NPI 1790051084

Zachary Mark Working, MD is an Orthopedic Surgery in Portland, Oregon. Graduated from University of Pittsburgh School of Medicine in 2012, 14 years ago. Practices with University Professional Services, a 1,704-clinician group, works from 3 locations and accepts Medicare assignment. Licensed in California and Oregon.

Years since qualifying
14
Trained at
University of Pittsburgh School of Medicine
Licensed in
CA, OR
In the registry since
2012
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

3181 SW Sam Jackson Park Rd
Portland, OR 97239-3011
Phone: (503) 494-6400
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (2)

  • 400 Parnassus Ave, San Francisco, CA 94143-2202 — (415) 476-1000
  • 50 N Medical Dr, Salt Lake City, UT 84132-0001 — (801) 581-2121

Specialties & licences

Orthopaedic Trauma Physician (primary) Taxonomy 207XX0801X · Licence MD188610 (OR)
Orthopaedic Surgery Physician Taxonomy 207X00000X · Licence A148264 (CA)

Record details

NPI number1790051084
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedMarch 30, 2012
Last updated in NPPESAugust 21, 2024
Certification dateAugust 21, 2024
Mailing addressSam Jackson Hall, Suite 2360, 3181 S.W. Sam Jackson Park Road, Portland, OR 97239

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyORTHOPEDIC SURGERY
Medical schoolUNIVERSITY OF PITTSBURGH SCHOOL OF MEDICINE
Graduated 2012 (14 years in practice)
Group practice University Professional Services — 1704 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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