Dr. Jason S. Mak, MD
- Part D claims, 2023
- 92
- Hospital affiliations
- 1
- Industry payments
- $264
- Medical group
- 1
- Insurance carriers
- 1
- Practice address
- 999 San Bernardino Rd, Upland, CA 91786
- Practice phone
- Call (909) 985-2811
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
San Antonio Regional Hospital
Upland, California
Find Dr. Mak's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Jason S. Mak is a nephrologist in Upland, California
Dr. Mak practices at San Antonio Regional Hospital in Upland, California.
Dr. Mak's NPI, 1851450456, was assigned on December 8, 2006. Dr. Mak graduated from UC Irvine School of Medicine in 1982. Dr. Mak holds California license G50436.
- NPI
- 1851450456NPI Registry (opens in a new tab)
- NPI enumeration date
- December 8, 2006
- NPI status
- Active
- Practice phone
- (909) 985-2811
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 70
- Medical school graduation
- 1982
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Practice Data
Dr. Jason S. Mak practices at San Antonio Regional Hospital in Upland, California
Dr. Mak's primary practice is San Antonio Regional Hospital, at 999 San Bernardino Rd, Upland, CA 91786 in San Bernardino County. The practice phone is (909) 985-2811.
- San Antonio Regional Hospital999 San Bernardino Rd, Upland, CA 91786 · San Bernardino CountyPhone(909) 985-2811
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Jason S. Mak is affiliated with 2 sites of care and 1 medical group
Dr. Mak's primary practice is San Antonio Regional Hospital in Upland, California. Dr. Mak is also affiliated with Fontana Medical Center. The medical group on file is Southern California Permanente Medical Group.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Jason S. Mak's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Mak practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| San Antonio Regional Hospital | 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. Jason S. Mak is one of 1,401 nephrologists in California
Nephrology is Dr. Mak's primary specialty in the NPI Registry, under taxonomy code 207RN0300X. Dr. Mak is board certified in nephrology by the American Board of Internal Medicine. Dr. Mak is licensed in California.
Specialties and state licenses
- Nephrology, CaliforniaPrimary
Nephrologists near Dr. Mak
Counts of nephrologists 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. Jason S. Mak's patients have a median age of 89
Across all payers, Dmand AI patient panel data puts Dr. Mak's median patient age at 89, with 100% women.
Dr. Mak's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 89
Patient panel by sex, all payers
- Women100%
- Men0%
Source: Dmand AI Patient Panel Data
Dr. Jason S. Mak wrote 92 Medicare Part D claims in 2023
In 2023, Dr. Mak wrote 92 Medicare Part D claims. Every claim was for a generic drug. They cover 6 drugs, with $4,939 in total drug cost. In 2022, CMS named 429 claims across 13 drugs.
Dr. Mak's most prescribed drugs by claims, 2023
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2022 to 2023
- 2022
- 2023
- Claims for drugs CMS names
- 2022: 4292023: 9279%
Drugs named by CMS: 6 in 2023, 13 in 2022.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
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Filter 7.4M+ HCPs by Medicare procedures, Part D drugs and Open Payments history, then reach them with verified contacts in one login.
Dr. Jason S. Mak received $264 in industry payments from 2018 to 2022
CMS Open Payments shows 3 general payments to Dr. Mak from 2 drug and device companies from 2018 to 2022. Food and beverage make up the largest share, 100% of the total. Alexion Pharmaceuticals, Inc. paid the most, $241.
General payments to Dr. Mak by program year, 2018 to 2022
Companies that paid Dr. Mak the most, 2018 to 2022
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Jason S. Mak has 1 award and honors on record
Dmand AI lists 1 award for Dr. Mak, most recently CMS Stage 1 2012 in 2011.
Awards and honors for Dr. Mak
- 2011
- CMS Stage 1 2012
Source: Dmand AI Professional Profile Data
Dr. Jason S. Mak graduated from UC Irvine School of Medicine
Dr. Mak graduated from UC Irvine School of Medicine in 1982.
- Medical school
- Board certified in nephrology
Source: Dmand AI Professional Profile Data
Dr. Jason S. Mak accepts plans from 1 insurance carrier
Dr. Mak is in network with 1 carrier, including Kaiser Permanente. EPO plans come from the most carriers, 1. Check the plan with the practice before a visit.
- Kaiser Permanente
Plan types Dr. Mak accepts, by number of carriers
- EPO1
- HMO1
- POS1
Source: Dmand AI Insurance Network Data
Sources for Dr. Jason S. Mak'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 | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand 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) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Awards and committee roles | Dmand AI Professional Profile Data |
| 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. Jason S. Mak
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. Jason S. Mak's NPI number?
Dr. Jason S. Mak's NPI number is 1851450456. It was assigned on December 8, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Jason S. Mak?
Dr. Jason S. Mak is a nephrologist in Upland, California. The primary specialty in the NPI Registry is Nephrology Physician (taxonomy code 207RN0300X).
Where does Dr. Jason S. Mak practice?
Dr. Mak practices at 999 San Bernardino Rd, Upland, CA 91786. Dr. Mak's primary practice is San Antonio Regional Hospital in Upland, California.
What is Dr. Jason S. Mak's office phone number?
The practice phone on file for Dr. Mak is (909) 985-2811.
What is Dr. Jason S. Mak's medical license number?
Dr. Mak holds California license G50436.
Which hospitals is Dr. Jason S. Mak affiliated with?
Dr. Mak is affiliated with Fontana Medical Center.
What medical group is Dr. Jason S. Mak part of?
Dr. Mak is linked to Southern California Permanente Medical Group.
Is Dr. Jason S. Mak board certified?
Yes. Dr. Mak is board certified in nephrology by the American Board of Internal Medicine.
Where did Dr. Jason S. Mak go to medical school?
Dr. Mak graduated from UC Irvine School of Medicine in 1982.
What drugs does Dr. Jason S. Mak prescribe most?
In 2023 Medicare Part D data, Dr. Mak's most prescribed drugs by claims were Amlodipine Besylate, Hydralazine HCl and Metoprolol Tartrate.
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Has Dr. Jason S. Mak received payments from drug or device companies?
CMS Open Payments shows $264 in general payments to Dr. Mak from 2 companies from 2018 to 2022. The largest total came from Alexion Pharmaceuticals, Inc.
How long has Dr. Jason S. Mak been practicing?
Dr. Mak graduated from medical school in 1982, 44 years ago.
What insurance does Dr. Jason S. Mak accept?
Dr. Mak is in network with 1 carrier, including Kaiser Permanente. EPO plans come from the most carriers, 1. Check the plan with the practice before a visit.
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