Regina Marie Leoni, M.D.
Family Medicine Physician · Rancho Cucamonga, CA
Regina Marie Leoni, M.D. is a family medicine physician with a practice address in Rancho Cucamonga, California, and NPI 1568573582, issued on Aug 31, 2006. Check the license (California A83418, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Regina Marie Leoni
- Credential
- M.D.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- A83418 CA
Self-reported in NPPES; status is on the state search - Practice location
- 8599 Haven Ave, Rancho Cucamonga, CA 91730
- Phone
- (909) 989-2273
- Enumerated
- Aug 31, 2006
- Record last updated
- Oct 31, 2011 (not updated in 15 years: call before relying on the address or phone)
- Fax
- (909) 989-6999
- Medicare enrollment
- Enrolled (PECOS I20041202000733); accepts Medicare assignment
- Medical or professional school
- Loma Linda University School Of Medicine, 2001
- 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 8599 Haven Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Regina Marie Leoni in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A83418Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
27% more Medicare Part D claims than the average family medicine physician in 2024
4,500 Medicare Part D claims for 253 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 12% of claims. 118 claims were for opioids.
Most prescribed
- Amlodipine Besylate223 claims
- Atorvastatin Calcium204 claims
- Levothyroxine Sodium186 claims
- Alendronate Sodium154 claims
- Rosuvastatin Calcium144 claims
- Omeprazole125 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: $703.39
26 payments; by number, the most common kind was food and beverage; the largest payer was GlaxoSmithKline, LLC. The 55,478 providers of this specialty with any payment received $902.55 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.
Regina Marie Leoni among 17,133 family medicine physician records in California
Regina Marie Leoni, M.D. 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 2006, is newer than 6% of them.
- NPI issued2006 · 6% of these records are older, 59% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated2001 · median 2005 among the 10,652 with a school on file
- Record last updated2011 · 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).
62 family medicine physician records list a practice address in Rancho Cucamonga
They are 62 of the 4,579 NPPES records with a practice address in Rancho Cucamonga, and 17,133 family medicine physician records in California.
All 17,133 in California → Every provider in Rancho Cucamonga → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Marc Avent, DORancho Cucamonga, CA 917301437104783
- Eldine Banquerigo, M.D.Rancho Cucamonga, CA 917301851367528
- Steven Barag, D.O.Rancho Cucamonga, CA 917301366444838
- James Brown, M.D.Rancho Cucamonga, CA 917301073597738
- Juan Cortes, DORancho Cucamonga, CA 917301760432181
- Rommie Fakhoury, MDRancho Cucamonga, CA 917301528000643
- Sandra Force-Obrowski, M.D.Rancho Cucamonga, CA 917301023034873
- Patricia Guevara-Channell, MDRancho Cucomonga, CA 917301841266392
Common questions
What is Regina Marie Leoni, M.D.'s NPI number?
Regina Marie Leoni, M.D.'s National Provider Identifier (NPI) is 1568573582, issued on Aug 31, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Regina Marie Leoni, M.D. located?
The NPPES record lists a practice address at 8599 Haven Ave, Rancho Cucamonga, CA, 91730. Phone: (909) 989-2273. Providers update this record themselves, so call before visiting.
How can I verify Regina Marie Leoni, M.D.'s license?
NPPES lists California license number A83418, 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 Regina Marie Leoni, M.D. prescribe under Medicare Part D?
In 2024, Regina Marie Leoni, M.D. had 4,500 Medicare Part D claims for 253 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.