Jonathan P. Marquez
- Medicare services, 2019
- 17
- Medicare patients, 2024
- 21
- Part D claims, 2024
- 9,777
- Hospital affiliations
- 1
- Industry payments
- $29
- Practice address
- 9961 Sierra Ave, Fontana, CA 92335
- Practice phone
- Call (909) 427-5000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
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Jonathan P. Marquez is an internist in Fontana, California
Jonathan Marquez practices at Fontana Medical Center in Fontana, California, part of Kaiser Permanente.
Jonathan Marquez's NPI, 1922031699, was assigned on July 8, 2006. Jonathan Marquez holds Wisconsin license 49178-020.
- NPI
- 1922031699NPI Registry (opens in a new tab)
- Medicare PAC ID
- 7214940543
- NPI enumeration date
- July 8, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (909) 427-5000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 50
- Medical school graduation
- 2002
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Jonathan P. Marquez practices at Fontana Medical Center in Fontana, California
Jonathan Marquez's primary practice is Fontana Medical Center, at 9961 Sierra Ave, Fontana, CA 92335 in San Bernardino County. The practice phone is (909) 427-5000.
- Fontana Medical Center9961 Sierra Ave, Fontana, CA 92335 · San Bernardino CountyPhone(909) 427-5000
Source: Dmand AI Affiliation Data
Jonathan P. Marquez is affiliated with 1 site of care and 1 medical group
Jonathan Marquez's primary practice is Fontana Medical Center in Fontana, California, part of Kaiser Permanente. The medical group on file is Southern California Permanente Medical Group.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Jonathan P. Marquez's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Jonathan Marquez practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Fontana Medical Center | Available with a free account |
Source: Dmand AI Technology Install Data
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Jonathan P. Marquez is one of 16,751 internists in California
Internal medicine is Jonathan Marquez's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Jonathan Marquez is licensed in Wisconsin.
Specialties and state licenses
- Internal medicine, WisconsinPrimary
Internists near Jonathan Marquez
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
Jonathan P. Marquez billed Medicare for 17 services in 2019
CMS data shows 17 Medicare services from Jonathan Marquez across 1 procedure code in 2019, all of them office visits, for 21 Medicare patients. Medicare paid $565 for them. Every service was in an office.
Jonathan Marquez's Medicare services by type, 2018 to 2019
- 2018
- 2019
- Office and hospital visits
- 2018: 202019: 1715%
Jonathan Marquez compared with the California median for internists, 2019
- Jonathan Marquez
- California median
- Medicare services
- 17vs 36195% below
- Medicare patients
- 21vs 15186% below
- Part D claims
- 9,147vs 42121.7 times
Medians across 15,815 internists in California with Dmand AI profiles that report each measure.
Jonathan Marquez's most billed Medicare procedure codes, 2019
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Jonathan P. Marquez treated 21 Medicare patients in 2024, average age 71
CMS counts 21 Medicare patients who saw Jonathan Marquez in 2024. 52% of them have high blood pressure. Their average risk score is 1.23, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Jonathan Marquez's median patient age at 57, with 58% women.
Chronic conditions among Jonathan Marquez's Medicare patients, 2024
- High blood pressure52%
Share of Medicare patients with each condition. A patient can have several.
Jonathan Marquez's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 57
Patient panel by sex, all payers
- Women58%
- Men42%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Jonathan P. Marquez wrote 9,777 Medicare Part D claims in 2024
In 2024, Jonathan Marquez wrote 9,777 Medicare Part D claims for 1,205 patients. 89% of them were for generic drugs. CMS names the drug for 9,147 of them, across 131 drugs with 11 or more claims each, at $383,647 in total drug cost. In 2023, CMS named 9,231 claims across 132 drugs.
Jonathan Marquez's Part D claims by kind of drug, 2024
- Generic8,680 claims89%
- Brand-name933 claims10%
- Other164 claims2%
Jonathan Marquez's 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 Jonathan Marquez's Part D claims, 2024
- Opioids8%768 of 9,777 claims
- Antibiotics2%200 of 9,777 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: 9,2312024: 9,1471%
Drugs named by CMS: 131 in 2024, 132 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
Jonathan P. Marquez offers telehealth to Medicare patients
Jonathan Marquez accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Jonathan Marquez as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Jonathan P. Marquez received $29 in industry payments in 2025
CMS Open Payments shows 1 general payment to Jonathan Marquez from 1 drug or device company in 2025. Food and beverage make up the largest share, 100% of the total. Ethicon Inc. paid the most, $29.
Companies that paid Jonathan Marquez the most, 2025 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Jonathan P. Marquez'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 services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| 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) |
| 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 Jonathan P. Marquez
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Jonathan P. Marquez's NPI number?
Jonathan P. Marquez's NPI number is 1922031699. It was assigned on July 8, 2006, and it is active in the NPI Registry.
What does Jonathan P. Marquez specialize in?
Jonathan P. Marquez is an internist in Fontana, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Jonathan P. Marquez practice?
Jonathan Marquez practices at 9961 Sierra Ave, Fontana, CA 92335. Jonathan Marquez's primary practice is Fontana Medical Center in Fontana, California, part of Kaiser Permanente.
What is Jonathan P. Marquez's office phone number?
The practice phone on file for Jonathan Marquez is (909) 427-5000.
What is Jonathan P. Marquez's medical license number?
Jonathan Marquez holds Wisconsin license 49178-020.
Which hospitals is Jonathan P. Marquez affiliated with?
Jonathan Marquez practices at Fontana Medical Center in Fontana, California.
What medical group is Jonathan P. Marquez part of?
Jonathan Marquez is linked to Southern California Permanente Medical Group.
Does Jonathan P. Marquez accept Medicare?
Yes. CMS data shows Jonathan Marquez billed Medicare for 17 services in 2019, and Jonathan Marquez accepts Medicare assignment.
Does Jonathan P. Marquez offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Jonathan Marquez as offering telehealth services.
How many Medicare patients does Jonathan P. Marquez see?
CMS counts 21 Medicare patients who saw Jonathan Marquez in 2024, with an average age of 71.
Show 4 more questionsShow fewer questions
What services does Jonathan P. Marquez bill to Medicare?
In 2019, Jonathan Marquez's most billed Medicare services were office visit, established patient (99213).
What drugs does Jonathan P. Marquez prescribe most?
In 2024 Medicare Part D data, Jonathan Marquez's most prescribed drugs by claims were Atorvastatin Calcium, Hydrocodone-Acetaminophen and Losartan Potassium.
Has Jonathan P. Marquez received payments from drug or device companies?
CMS Open Payments shows $29 in general payments to Jonathan Marquez from 1 company from 2025 to 2025. The largest total came from Ethicon Inc.
How long has Jonathan P. Marquez been practicing?
Jonathan Marquez graduated from medical school in 2002, 24 years ago.
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