Greg A. Brown, M.D.
Internal Medicine Physician · San Clemente, CA
Greg A. Brown, M.D. is an internal medicine physician with a practice address in San Clemente, California, and NPI 1720135346, issued on Jan 4, 2007. Check the license (California A40335, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Greg A. Brown
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A40335 CA
Self-reported in NPPES; status is on the state search - Practice location
- 655 Camino DE Los Mares, San Clemente, CA 92673
- Phone
- (949) 661-9657
- Enumerated
- Jan 4, 2007
- Record last updated
- Dec 16, 2008 (not updated in 18 years: call before relying on the address or phone)
- Fax
- (949) 661-1352
- Medicaid ID
- 00A403350 CA
- Medicare enrollment
- Enrolled (PECOS I20081212000282); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 655 Camino DE Los Mares
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Debra HetschelMental Health Counselor1447484910
- Carolyn MaxwellMarriage & Family Therapist1720120728
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Verify Greg A. Brown in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A40335Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
3.0 times the Medicare Part D claims of the average internal medicine physician in 2024
9,663 Medicare Part D claims for 583 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 11% of claims. 260 claims were for opioids.
Most prescribed
- Atorvastatin Calcium441 claims
- Amlodipine Besylate390 claims
- Losartan Potassium364 claims
- Levothyroxine Sodium337 claims
- Rosuvastatin Calcium318 claims
- Metformin Hcl316 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: $777.62
32 payments; by number, the most common kind was food and beverage; the largest payer was Boehringer Ingelheim Pharmaceuticals, Inc. 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.
Greg A. Brown among 17,696 internal medicine physician records in California
Greg A. Brown, M.D. 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 2007, is newer than 44% of them.
- NPI issued2007 · 44% of these records are older, 44% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated1983 · median 2004 among the 11,065 with a school on file
- Record last updated2008 · 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).
16 internal medicine physician records list a practice address in San Clemente
They are 16 of the 969 NPPES records with a practice address in San Clemente, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in San Clemente → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Lawrence Chang, M.D.San Clemente, CA 926731528046430
- Steven Cullen, MDSan Clemente, CA 926731487765731
- Karen Garner, MDSan Clemente, CA 926731770639189
- Nick Karahalios, MDSan Clemente, CA 926731255442505
- Seema Khan, M.DSan Clemente, CA 926731376795617
- Torsten Kruse, M.D.San Clemente, CA 926731972644482
- Simon Outhwaite, MDSan Clemente, CA 926731851402002
- Faramarz Payandeh, MDSan Clemente, CA 926731346250701
Common questions
What is Greg A. Brown, M.D.'s NPI number?
Greg A. Brown, M.D.'s National Provider Identifier (NPI) is 1720135346, issued on Jan 4, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Greg A. Brown, M.D. located?
The NPPES record lists a practice address at 655 Camino DE Los Mares, San Clemente, CA, 92673. Phone: (949) 661-9657. Providers update this record themselves, so call before visiting.
How can I verify Greg A. Brown, M.D.'s license?
NPPES lists California license number A40335, 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 Greg A. Brown, M.D. prescribe under Medicare Part D?
In 2024, Greg A. Brown, M.D. had 9,663 Medicare Part D claims for 583 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.