Gillian Mackay, M.D.
Obstetrics & Gynecology Physician · La Jolla, CA
Gillian Mackay, M.D. is an obstetrics & gynecology physician with a practice address in La Jolla, California, and NPI 1770702177, issued on Apr 24, 2007. Check the license (California A113346, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Gillian Mackay
- Credential
- M.D.
- Primary taxonomy
- Obstetrics & Gynecology Physician 207V00000X
- License number
- A113346 CA
Self-reported in NPPES; status is on the state search - Practice location
- 8910 Villa LA Jolla Dr, La Jolla, CA 92037
- Phone
- (800) 926-8273
- Enumerated
- Apr 24, 2007
- Record last updated
- Nov 13, 2025
- Fax
- (888) 539-8781
- Medicare enrollment
- Enrolled (PECOS I20110622000673); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest obstetrics & gynecology physician records → All 5,088 in California → Look up another NPI →
Also registered at 8910 Villa LA Jolla Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Sanjay Agarwal, M.D.Reproductive Endocrinology Physician1255489720
- Laura Biver, MDObstetrics & Gynecology Physician1669091427
- Brian Chin, MDEmergency Medicine Physician1770140782
- Pamela Deak, M.D.Obstetrics & Gynecology Physician1316978554
- Pratima Gupta, MDObstetrics & Gynecology Physician1891749842
- Matthew LippiEmergency Medicine Physician1932736485
Verify Gillian Mackay in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A113346Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
65% fewer Medicare Part D claims than the average obstetrics & gynecology physician in 2024
57 Medicare Part D claims for 15 beneficiaries, against an average of 165 among the 28,733 providers of this specialty who prescribed in Part D. Brand-name drugs were 19% of 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).
Gillian Mackay among 5,088 obstetrics & gynecology physician records in California
Gillian Mackay, M.D. is one of 5,088 obstetrics & gynecology physician records with a practice address in California. 74% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 48% of them.
- NPI issued2007 · 48% of these records are older, 38% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileYes · 53% of these records are
- Graduated2001 · median 2004 among the 2,700 with a school on file
- Record last updated2025 · 64% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207V00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
68 obstetrics & gynecology physician records list a practice address in La Jolla
They are 68 of the 3,648 NPPES records with a practice address in La Jolla, and 5,088 obstetrics & gynecology physician records in California.
All 5,088 in California → Every provider in La Jolla → Obstetrics & Gynecology Physician nationwide →
The 8 obstetrics & gynecology physician records with the nearest ZIP codes
- Timothy Bilash, M.D., M.S.La Jolla, CA 920371437189545
- Seth Bulow, M.D.La Jolla, CA 920371174635320
- Chrysten Cunningham, DOLa Jolla, CA 920371265435606
- Pamela Deak, M.D.La Jolla, CA 920371316978554
- Maureen Farrell, M.D.La Jolla, CA 920371508842303
- Robert Gordon, M.D.La Jolla, CA 920371619944030
- Pratima Gupta, MDLa Jolla, CA 920371891749842
- Patrick Haggerty, MDLa Jolla, CA 920371245280841
Common questions
What is Gillian Mackay, M.D.'s NPI number?
Gillian Mackay, M.D.'s National Provider Identifier (NPI) is 1770702177, issued on Apr 24, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Gillian Mackay, M.D. located?
The NPPES record lists a practice address at 8910 Villa LA Jolla Dr, La Jolla, CA, 92037. Phone: (800) 926-8273. Providers update this record themselves, so call before visiting.
How can I verify Gillian Mackay, M.D.'s license?
NPPES lists California license number A113346, 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 Gillian Mackay, M.D. prescribe under Medicare Part D?
In 2024, Gillian Mackay, M.D. had 57 Medicare Part D claims for 15 beneficiaries; the average among obstetrics & gynecology physician prescribers was 165. 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.