Catherine Mary McMillan
Internal Medicine Physician · San Juan Capistrano, CA
Catherine Mary McMillan is an internal medicine physician with a practice address in San Juan Capistrano, California, and NPI 1114580222, issued on Apr 16, 2019. Check the license (California 20A19880, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Catherine Mary McMillan
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 20A19880 CA
Self-reported in NPPES; status is on the state search - Practice location
- 30230 Rancho Viejo RD Ste 200, San Juan Capistrano, CA 92675
- Phone
- (949) 443-4303
- Enumerated
- Apr 16, 2019
- Record last updated
- Nov 28, 2023
- Fax
- (949) 443-4033
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 30230 Rancho Viejo RD Ste 200
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Nicholas Blakely, PA-CPhysician Assistant1275345753
- Kaelin Brown, AGACNPAcute Care Nurse Practitioner1952896128
- Deepa Oza, FNP-CInternal Medicine Physician1336679323
- Jay Patel, MDPulmonary Disease Physician1467834044
- Kaveh Rezvan, D.O.Pulmonary Disease Physician1003140922
- Sherry Schulman, RDNRegistered Dietitian1922527407
Verify Catherine Mary McMillan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A19880Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
80% fewer Medicare Part D claims than the average internal medicine physician in 2024
647 Medicare Part D claims for 111 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 26 claims were for opioids.
Most prescribed
- Rosuvastatin Calcium22 claims
- Levothyroxine Sodium19 claims
- Synthroid19 claims
- Alendronate Sodium18 claims
- Furosemide18 claims
- Metformin Hcl Er18 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.
Industry payments in 2024: $428.15
18 payments; by number, the most common kind was food and beverage; the largest payer was Lilly USA, LLC. The 50,334 providers of this specialty with any payment received $1,303.06 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Catherine Mary McMillan among 17,696 internal medicine physician records in California
Catherine Mary McMillan is one of 17,696 internal medicine physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2019, is newer than 86% of them.
- NPI issued2019 · 86% of these records are older, 11% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 63% of these records are
- Record last updated2023 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
10 internal medicine physician records list a practice address in San Juan Capistrano
They are 10 of the 676 NPPES records with a practice address in San Juan Capistrano, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in San Juan Capistrano → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Patricia Ahearn, M.D.San Juan Capistrano, CA 926751982655304
- Bishen Bedi, MDSan Juan Capistrano, CA 926751538690284
- Gracia Covarrubias, MDSan Juan Capistrano, CA 926751730119751
- Yu-Hua Fang, M.D.San Juan Capistrano, CA 926751881647642
- Thuytrang Nguyen, M.D.San Juan Capistrano, CA 926751861537656
- Deepa Oza, FNP-CSan Juan Capistrano, CA 926751336679323
- Audrey Rocco-Welch, MDSan Juan Capistrano, CA 926751770616716
- Jesus Valadez, MDSan Juan Capistrano, CA 926751144221839
Common questions
What is Catherine Mary McMillan's NPI number?
Catherine Mary McMillan's National Provider Identifier (NPI) is 1114580222, issued on Apr 16, 2019. An NPI identifies a provider in billing; it is not a license.
Where is Catherine Mary McMillan located?
The NPPES record lists a practice address at 30230 Rancho Viejo RD Ste 200, San Juan Capistrano, CA, 92675. Phone: (949) 443-4303. Providers update this record themselves, so call before visiting.
How can I verify Catherine Mary McMillan's license?
NPPES lists California license number 20A19880, 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 Catherine Mary McMillan prescribe under Medicare Part D?
In 2024, Catherine Mary McMillan had 647 Medicare Part D claims for 111 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.