Dr. Leo Robert Zacks, MD
- Part D claims, 2024
- 8,043
- Hospital affiliations
- 1
- Industry payments
- $11
- Medical group
- 1
- Insurance carriers
- 3
- Practice address
- 10800 Magnolia Avenue, Riverside, CA 92505
- Practice phone
- Call (951) 353-2000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Zacks' professional email, personal email and mobile number
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Dr. Leo Robert Zacks is an internist in Riverside, California
Dr. Zacks practices at Riverside Medical Center in Riverside, California, part of Kaiser Permanente.
Dr. Zacks' NPI, 1386038578, was assigned on March 25, 2015. Dr. Zacks graduated from St. George's University School of Medicine in 2015. Dr. Zacks' California license number on file is A154099.
- NPI
- 1386038578NPI Registry (opens in a new tab)
- Medicare PAC ID
- 2961719737
- NPI enumeration date
- March 25, 2015
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (951) 353-2000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 37
- Medical school graduation
- 2015
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Leo Robert Zacks practices at Riverside Medical Center in Riverside, California
Dr. Zacks' primary practice is Riverside Medical Center, at 10800 Magnolia Avenue, Riverside, CA 92505 in Riverside County. The practice phone is (951) 353-2000.
- Riverside Medical Center10800 Magnolia Avenue, Riverside, CA 92505 · Riverside CountyPhone(951) 353-2000
Source: Dmand AI Affiliation Data
Dr. Leo Robert Zacks is affiliated with 2 sites of care and 1 medical group
Dr. Zacks' primary practice is Riverside Medical Center in Riverside, California, part of Kaiser Permanente. The medical group on file is Southern California Permanente Medical Group. Dmand AI also links Dr. Zacks to 1 more group practice or clinic, named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Leo Robert Zacks' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Zacks practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Riverside Medical Center | Available with a free account |
| +1 more affiliated site | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Leo Robert Zacks is one of 16,751 internists in California
Internal medicine is Dr. Zacks' primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Zacks is board certified in internal medicine by the American Board of Internal Medicine. Dmand AI has Dr. Zacks' licenses on file in 2 states: California and Nevada.
Specialties and state licenses
- Internal medicine, CaliforniaPrimary
- Nevada license
Clinical focus
Dmand AI lists chronic diabetes, high cholesterol, muscle pain, fibromyalgia, and limb pain and obesity among the conditions Dr. Zacks treats.
Internists near Dr. Zacks
Counts of internists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Leo Robert Zacks' patients have a median age of 61
Across all payers, Dmand AI patient panel data puts Dr. Zacks' median patient age at 61, with 52% women.
Dr. Zacks' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 61
Patient panel by sex, all payers
- Women52%
- Men47%
Source: Dmand AI Patient Panel Data
Dr. Leo Robert Zacks wrote 8,043 Medicare Part D claims in 2024
In 2024, Dr. Zacks wrote 8,043 Medicare Part D claims for 866 patients. 88% of them were for generic drugs. CMS names the drug for 7,481 of them, across 110 drugs with 11 or more claims each, at $470,401 in total drug cost. In 2023, CMS named 8,131 claims across 110 drugs.
Dr. Zacks' Part D claims by kind of drug, 2024
- Generic7,057 claims88%
- Brand-name867 claims11%
- Other119 claims1%
Dr. Zacks' most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Zacks' Part D claims, 2024
- Opioids4%290 of 8,043 claims
- Antibiotics1%89 of 8,043 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 8,1312024: 7,4818%
Drugs named by CMS: 110 in 2024, 110 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Dr. Leo Robert Zacks takes part in Medicare
Dr. Zacks accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Leo Robert Zacks received $11 in industry payments in 2016
CMS Open Payments shows 1 general payment to Dr. Zacks from 1 drug or device company in 2016. Food and beverage make up the largest share, 100% of the total. Bristol-Myers Squibb Company paid the most, $11.
Companies that paid Dr. Zacks the most, 2016 to 2016
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Leo Robert Zacks graduated from St. George's University School of Medicine
Dr. Zacks graduated from St. George's University School of Medicine in 2015.
- Medical school
- Board certified in internal medicine
Source: Dmand AI Professional Profile Data
Dr. Leo Robert Zacks accepts plans from 3 insurance carriers
Dr. Zacks is in network with 3 carriers, including Kaiser Permanente, CMS Medicare and NV State Medicaid. EPO plans come from the most carriers, 1. Check the plan with the practice before a visit.
- Kaiser Permanente
- CMS Medicare
- NV State Medicaid
Plan types Dr. Zacks accepts, by number of carriers
- EPO1
- HMO1
- Medicaid1
- Medicare1
- POS1
Source: Dmand AI Insurance Network Data
Sources for Dr. Leo Robert Zacks's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Leo Robert Zacks
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Leo Robert Zacks' NPI number?
Dr. Leo Robert Zacks' NPI number is 1386038578. It was assigned on March 25, 2015, and it is active in the NPI Registry.
What kind of doctor is Dr. Leo Robert Zacks?
Dr. Leo Robert Zacks is an internist in Riverside, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Leo Robert Zacks practice?
Dr. Zacks practices at 10800 Magnolia Avenue, Riverside, CA 92505. Dr. Zacks' primary practice is Riverside Medical Center in Riverside, California, part of Kaiser Permanente. Dmand AI also links Dr. Zacks to 1 group practice or clinic.
What is Dr. Leo Robert Zacks' office phone number?
The practice phone on file for Dr. Zacks is (951) 353-2000.
What is Dr. Leo Robert Zacks' medical license number?
Dr. Zacks' California license number on file is A154099, one of the licenses on file in 2 states.
Which states has Dr. Leo Robert Zacks been licensed in?
Dmand AI has state licenses on file for Dr. Zacks in California (2018 to 2025) and Nevada (2015 to 2018).
Which hospitals is Dr. Leo Robert Zacks affiliated with?
Dr. Zacks practices at Riverside Medical Center in Riverside, California.
What medical group is Dr. Leo Robert Zacks part of?
Dr. Zacks is linked to Southern California Permanente Medical Group.
Does Dr. Leo Robert Zacks accept Medicare?
Yes. CMS lists Dr. Zacks as accepting Medicare assignment.
Is Dr. Leo Robert Zacks board certified?
Yes. Dr. Zacks is board certified in internal medicine by the American Board of Internal Medicine.
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Where did Dr. Leo Robert Zacks go to medical school?
Dr. Zacks graduated from St. George's University School of Medicine in 2015.
What drugs does Dr. Leo Robert Zacks prescribe most?
In 2024 Medicare Part D data, Dr. Zacks' most prescribed drugs by claims were Atorvastatin Calcium, Amlodipine Besylate and Lisinopril.
Has Dr. Leo Robert Zacks received payments from drug or device companies?
CMS Open Payments shows $11 in general payments to Dr. Zacks from 1 company from 2016 to 2016. The largest total came from Bristol-Myers Squibb Company.
How long has Dr. Leo Robert Zacks been practicing?
Dr. Zacks graduated from medical school in 2015, 11 years ago.
What insurance does Dr. Leo Robert Zacks accept?
Dr. Zacks is in network with 3 carriers, including Kaiser Permanente, CMS Medicare and NV State Medicaid. EPO plans come from the most carriers, 1. Check the plan with the practice before a visit.
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