Margaret Macmillan, MD
Family Medicine Physician · Santa Cruz, CA
Margaret Macmillan, MD is a family medicine physician with a practice address in Santa Cruz, California, and NPI 1790765287, issued on Jan 19, 2006. Check the license (California G72046, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Margaret Macmillan
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- G72046 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1203 Mission St, Santa Cruz, CA 95060
- Phone
- (831) 458-6300
- Enumerated
- Jan 19, 2006
- Record last updated
- Dec 21, 2011 (not updated in 15 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20080625000314); accepts Medicare assignment
- Medical or professional school
- University Of Southern California Keck School Of Medicine, 1990
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 17,133 in California → Look up another NPI →
Verify Margaret Macmillan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G72046Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
9% more Medicare Part D claims than the average family medicine physician in 2024
3,873 Medicare Part D claims for 405 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 9% of claims. 181 claims were for opioids.
Most prescribed
- Atorvastatin Calcium264 claims
- Levothyroxine Sodium212 claims
- Lisinopril173 claims
- Losartan Potassium149 claims
- Hydrocodone-Acetaminophen129 claims
- Amlodipine Besylate121 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- Sutter Bay Medical FoundationLos Altos, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Margaret Macmillan among 17,133 family medicine physician records in California
Margaret Macmillan, MD is one of 17,133 family medicine physician records with a practice address in California. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 6% of them.
- NPI issued2006 · 6% of these records are older, 59% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated1990 · median 2005 among the 10,652 with a school on file
- Record last updated2011 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
114 family medicine physician records list a practice address in Santa Cruz
They are 114 of the 5,138 NPPES records with a practice address in Santa Cruz, and 17,133 family medicine physician records in California.
All 17,133 in California → Every provider in Santa Cruz → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Josee Belanger, MDSanta Cruz, CA 950601437261989
- Flavio Cornejo, DOSanta Cruz, CA 950601285734327
- Michael Coulson, MDSanta Cruz, CA 950601790869238
- Maria Greaves, M.D.Santa Cruz, CA 950601467484154
- Jennifer Hastings, M.D.Santa Cruz, CA 950601861505927
- Rose Marie Hendrix, DOSanta Cruz, CA 950601629078415
- Whay Jones, MDSanta Cruz, CA 950601952301020
- Miki Joy, M.D.Santa Cruz, CA 950601134122922
Common questions
What is Margaret Macmillan, MD's NPI number?
Margaret Macmillan, MD's National Provider Identifier (NPI) is 1790765287, issued on Jan 19, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Margaret Macmillan, MD located?
The NPPES record lists a practice address at 1203 Mission St, Santa Cruz, CA, 95060. Phone: (831) 458-6300. Providers update this record themselves, so call before visiting.
How can I verify Margaret Macmillan, MD's license?
NPPES lists California license number G72046, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Margaret Macmillan, MD prescribe under Medicare Part D?
In 2024, Margaret Macmillan, MD had 3,873 Medicare Part D claims for 405 beneficiaries; the average among family medicine physician prescribers was 3,544. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.