Robert S. Greenfield, MD
Cardiovascular Disease Physician · Fountain Valley, CA
Robert S. Greenfield, MD is a cardiovascular disease physician with a practice address in Fountain Valley, California, and NPI 1649307000, issued on Feb 27, 2007. Check the license (California G29135, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Robert S. Greenfield
- Credential
- MD
- Primary taxonomy
- Cardiovascular Disease Physician 207RC0000X
- License number
- G29135 CA
Self-reported in NPPES; status is on the state search - Practice location
- 18111 Brookhurst St # 5100, Fountain Valley, CA 92708
- Phone
- (714) 546-2238
- Enumerated
- Feb 27, 2007
- Record last updated
- Aug 26, 2019 (not updated in 7 years: call before relying on the address or phone)
- Fax
- (714) 434-8145
- Medicaid ID
- YYY492984Y CA
- Entity
- Type 1 · individual
8 nearest cardiovascular disease physician records → All 2,574 in California → Look up another NPI →
Also registered at 18111 Brookhurst St # 5100
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Arvind Nirula, M.D.Cardiovascular Disease Physician1437285095
Verify Robert S. Greenfield in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G29135Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
99% fewer Medicare Part D claims than the average cardiovascular disease physician in 2024
29 Medicare Part D claims, against an average of 3,078 among the 20,728 providers of this specialty who prescribed in Part D.
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: $977.10
8 payments; by number, the most common kind was food and beverage; the largest payer was Medtronic, Inc. The 16,686 providers of this specialty with any payment received $3,819.56 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.
Robert S. Greenfield among 2,574 cardiovascular disease physician records in California
Robert S. Greenfield, MD is one of 2,574 cardiovascular disease physician records with a practice address in California. 83% 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 55% of them.
- NPI issued2007 · 55% of these records are older, 33% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileNo · 68% of these records are
- Record last updated2019 · 63% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RC0000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Cardiovascular Disease Physician providers in California
There are 2,574 cardiovascular disease physician records in California.
All 2,574 in California → Every provider in Fountain Valley → Cardiovascular Disease Physician nationwide →
The 8 cardiovascular disease physician records with the nearest ZIP codes
- Bao Bui, M.D.Fountain Valley, CA 927081801099593
- Simon Cheung, M.D.Fountain Valley, CA 927081841370210
- Amanda Donohue, D.O.Fountain Valley, CA 927081750587143
- Sarah Elsayed, M.D.Fountain Valley, CA 927081396049029
- Steven Le, M.D.Fountain Valley, CA 927081780835801
- Arvind Nirula, M.D.Fountain Valley, CA 927081437285095
- Sanjiv Patel, M.D.Fountain Valley, CA 927081982801718
- Maria Rizza, M.D.Fountain Valley, CA 927081689638280
Common questions
What is Robert S. Greenfield, MD's NPI number?
Robert S. Greenfield, MD's National Provider Identifier (NPI) is 1649307000, issued on Feb 27, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Robert S. Greenfield, MD located?
The NPPES record lists a practice address at 18111 Brookhurst St # 5100, Fountain Valley, CA, 92708. Phone: (714) 546-2238. Providers update this record themselves, so call before visiting.
How can I verify Robert S. Greenfield, MD's license?
NPPES lists California license number G29135, 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 Robert S. Greenfield, MD prescribe under Medicare Part D?
In 2024, Robert S. Greenfield, MD had 29 Medicare Part D claims; the average among cardiovascular disease physician prescribers was 3,078. 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.