Caitlin Macmillen, DO
Family Medicine Physician · San Diego, CA
Caitlin Macmillen, DO is a family medicine physician with a practice address in San Diego, California, and NPI 1518321629, issued on Apr 6, 2016. Check the license (California 20A16037, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Caitlin Macmillen
- Credential
- DO
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 20A16037 CA
Self-reported in NPPES; status is on the state search - Practice location
- 200 West Arbor Drive, San Diego, CA 92103
- Phone
- (615) 543-2165
- Enumerated
- Apr 6, 2016
- Record last updated
- Sep 25, 2019 (not updated in 7 years: call before relying on the address or phone)
- Fax
- (619) 543-5776
- Medicare enrollment
- Enrolled (PECOS I20191028002133); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 17,133 in California → Look up another NPI →
Also registered at 200 West Arbor Drive
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Caitlin Macmillen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A16037Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
68% fewer Medicare Part D claims than the average family medicine physician in 2024
1,128 Medicare Part D claims for 118 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. 27 claims were for opioids.
Most prescribed
- Atorvastatin Calcium69 claims
- Losartan Potassium62 claims
- Gabapentin60 claims
- Levothyroxine Sodium57 claims
- Rosuvastatin Calcium38 claims
- Amlodipine Besylate28 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
- Regents OF The University OF CaliforniaSan Diego, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Caitlin Macmillen among 17,133 family medicine physician records in California
Caitlin Macmillen, DO 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 2016, is newer than 76% of them.
- NPI issued2016 · 76% of these records are older, 21% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated2016 · median 2005 among the 10,652 with a school on file
- Record last updated2019 · 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).
780 family medicine physician records list a practice address in San Diego
They are 780 of the 52,937 NPPES records with a practice address in San Diego, and 17,133 family medicine physician records in California.
All 17,133 in California → Every provider in San Diego → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
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- Ian Diaz, MDSan Diego, CA 921031023038411
- Theodore Ganiats, M.D.San Diego, CA 921031659303170
- Cecilia Gutierrez, M.D.San Diego, CA 921031780600528
- Esmatullah HatamySan Diego, CA 921031659329837
- Gene Kallenberg, M.D.San Diego, CA 921031861417446
- Stacey Layle, MDSan Diego, CA 921031437112349
Common questions
What is Caitlin Macmillen, DO's NPI number?
Caitlin Macmillen, DO's National Provider Identifier (NPI) is 1518321629, issued on Apr 6, 2016. An NPI identifies a provider in billing; it is not a license.
Where is Caitlin Macmillen, DO located?
The NPPES record lists a practice address at 200 West Arbor Drive, San Diego, CA, 92103. Phone: (615) 543-2165. Providers update this record themselves, so call before visiting.
How can I verify Caitlin Macmillen, DO's license?
NPPES lists California license number 20A16037, 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 Caitlin Macmillen, DO prescribe under Medicare Part D?
In 2024, Caitlin Macmillen, DO had 1,128 Medicare Part D claims for 118 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.