Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Margaret Macmillan, MD

Individual provider Family Medicine Physician · NPI 1790765287

Margaret Macmillan, MD is registered under Family Practice in Santa Cruz, California. Graduated from University of Southern California Keck School of Medicine in 1990, 36 years ago. Practices with Sutter Bay Medical Foundation, a 3,762-clinician group, accepts Medicare assignment and offers telehealth. Licensed in California.

Years since qualifying
36
Trained at
University of Southern California Keck School of Medicine
Licensed in
CA
In the registry since
2006
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

1203 Mission St
Santa Cruz, CA 95060-3528 Not confirmed with CMS for 14 years — call before visiting
Phone: (831) 458-6300
Show map & directions

Directions in Google Maps · Apple Maps · OpenStreetMap

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Family Medicine Physician (primary) Taxonomy 207Q00000X · Licence G72046 (CA)

Record details

NPI number1790765287
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorNo
NPI enumeratedJanuary 19, 2006
Last updated in NPPESDecember 21, 2011

Medicare enrollment

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

Medicare specialtyFAMILY PRACTICE
Medical schoolUNIVERSITY OF SOUTHERN CALIFORNIA KECK SCHOOL OF MEDICINE
Graduated 1990 (36 years in practice)
Group practice Sutter Bay Medical Foundation — 3762 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services

Procedures

From CMS Care Compare, which counts the procedures a clinician billed to Original Medicare and Medicare Advantage over a recent 12-month period. CMS reports a fixed list of common procedures, so this is not everything the clinician does. Counts of 10 or fewer are given as a range, because CMS withholds small numbers.

Removal of skin lesions 31 times · 69th percentile
Removal or shaving of skin growth 1–10 times

The percentile compares how often this clinician performed the procedure with other clinicians who performed it, as CMS calculates it. It measures volume, not outcomes or skill.

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients290
Services billed 889 a service is one billed item, such as a visit, a test or a procedure
Average patient age75

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician. Those with a page here are linked.

  • Dominican Hospital Hospital · Santa Cruz, CA · listed as Dominican Hospital Foundation
  • Sutter Care At Home Home health agency · Santa Cruz, CA

Colleagues at Sutter Bay Medical Foundation

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 3762 clinicians in the practice; 12 are shown here.

Other providers in Santa Cruz