Leo Robert Zacks, M.D.
Internal Medicine Physician · Temecula, CA
Leo Robert Zacks, M.D. is an internal medicine physician with a practice address in Temecula, California, and NPI 1386038578, issued on Mar 25, 2015. Check the license (California A154099, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Leo Robert Zacks
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A154099 CA
Self-reported in NPPES; status is on the state search - Practice location
- 27309 Madison Ave, Temecula, CA 92590
- Phone
- (833) 574-2273
- Enumerated
- Mar 25, 2015
- Record last updated
- Nov 22, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20190315001019); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 27309 Madison Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Leo Robert Zacks in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A154099Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.5 times the Medicare Part D claims of the average internal medicine physician in 2024
8,043 Medicare Part D claims for 866 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. 290 claims were for opioids.
Most prescribed
- Atorvastatin Calcium783 claims
- Amlodipine Besylate390 claims
- Lisinopril369 claims
- Losartan Potassium346 claims
- Levothyroxine Sodium292 claims
- Rosuvastatin Calcium227 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
- Southern California Permanente Medical GroupRiverside, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Leo Robert Zacks among 17,696 internal medicine physician records in California
Leo Robert Zacks, 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 2015, is newer than 76% of them.
- NPI issued2015 · 76% of these records are older, 21% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated2015 · median 2004 among the 11,065 with a school on file
- Record last updated2021 · 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).
52 internal medicine physician records list a practice address in Temecula
They are 52 of the 4,057 NPPES records with a practice address in Temecula, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Temecula → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Michael Basch, M.D.Temecula, CA 925901790889350
- Nichele Blosser, DOTemecula, CA 925901366079899
- Osvaldo Lopez, MDTemecula, CA 925901649294505
- Carl Sainten, M.D.Temecula, CA 925901902963796
- Nizar Salek, MDTemecula, CA 925901407813785
- Charles Taft, M.D.Temecula, CA 925901366409617
- Syed Awais Ahmed, MDTemecula, CA 925911932858818
- Yogeshwar Chaturvedi, MDTemecula, CA 925911902929763
Common questions
What is Leo Robert Zacks, M.D.'s NPI number?
Leo Robert Zacks, M.D.'s National Provider Identifier (NPI) is 1386038578, issued on Mar 25, 2015. An NPI identifies a provider in billing; it is not a license.
Where is Leo Robert Zacks, M.D. located?
The NPPES record lists a practice address at 27309 Madison Ave, Temecula, CA, 92590. Phone: (833) 574-2273. Providers update this record themselves, so call before visiting.
How can I verify Leo Robert Zacks, M.D.'s license?
NPPES lists California license number A154099, 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 Leo Robert Zacks, M.D. prescribe under Medicare Part D?
In 2024, Leo Robert Zacks, M.D. had 8,043 Medicare Part D claims for 866 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.