Dr. Jonnel Ramos Constantino, MD
- Medicare services, 2024
- 11
- Medicare patients, 2024
- 18
- Part D claims, 2024
- 241
- Hospital affiliations
- 1
- Industry payments
- $122
- Practice address
- 9965 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
Kaiser Permanente - Fontana Medical Center
Fontana, California
Find Dr. Constantino'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. Jonnel Ramos Constantino is a hospitalist in Fontana, California
Dr. Constantino practices at Kaiser Permanente - Fontana Medical Center in Fontana, California.
Dr. Constantino's NPI, 1124246350, was assigned on April 23, 2007. Dr. Constantino graduated from University of the East College of Medicine in 1999. Dr. Constantino holds California license A89569.
- NPI
- 1124246350NPI Registry (opens in a new tab)
- Medicare PAC ID
- 8729172119
- NPI enumeration date
- April 23, 2007
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (909) 427-5000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 53
- Medical school graduation
- 1999
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Jonnel Ramos Constantino practices at Kaiser Permanente - Fontana Medical Center in Fontana, California
Dr. Constantino's primary practice is Kaiser Permanente - Fontana Medical Center, at 9965 Sierra Ave, Fontana, CA 92335 in San Bernardino County. The practice phone is (909) 427-5000.
- Kaiser Permanente - Fontana Medical Center9965 Sierra Ave, Fontana, CA 92335 · San Bernardino CountyPhone(909) 427-5000
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Jonnel Ramos Constantino is affiliated with 2 sites of care and 1 medical group
Dr. Constantino's primary practice is Kaiser Permanente - Fontana Medical Center in Fontana, California. Dr. Constantino 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. Jonnel Ramos Constantino's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Constantino practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Kaiser Permanente - Fontana 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. Jonnel Ramos Constantino is one of 3,186 hospitalists in California
Hospitalist is Dr. Constantino's primary specialty in the NPI Registry, under taxonomy code 208M00000X. Dr. Constantino is board certified in internal medicine by the American Board of Internal Medicine. Dr. Constantino is licensed in California.
Specialties and state licenses
- Hospitalist, CaliforniaPrimary
Clinical focus
Dmand AI lists seizures among the conditions Dr. Constantino treats.
Hospitalists near Dr. Constantino
Counts of hospitalists 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. Jonnel Ramos Constantino billed Medicare for 11 services in 2024
CMS data shows 11 Medicare services from Dr. Constantino across 1 procedure code in 2024, for 18 Medicare patients. Medicare paid $1,050 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Constantino compared with the California median for hospitalists, 2024
- Dr. Constantino
- California median
- Medicare services
- 11vs 43097% below
- Medicare patients
- 18vs 20191% below
- Part D claims
- 64vs 697% below
Medians across 2,991 hospitalists in California with Dmand AI profiles that report each measure.
Dr. Constantino's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for Dr. Constantino?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Constantino and other hospitalists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Jonnel Ramos Constantino treated 18 Medicare patients in 2024, average age 71
CMS counts 18 Medicare patients who saw Dr. Constantino in 2024. 75% of them have high blood pressure, and 72% have high cholesterol. Their average risk score is 3.86, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Constantino's median patient age at 69, with 55% women.
Chronic conditions among Dr. Constantino's Medicare patients, 2024
- High blood pressure75%
- High cholesterol72%
- Diabetes67%
Share of Medicare patients with each condition. A patient can have several.
Dr. Constantino's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 69
Patient panel by sex, all payers
- Women55%
- Men45%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Jonnel Ramos Constantino wrote 241 Medicare Part D claims in 2024
In 2024, Dr. Constantino wrote 241 Medicare Part D claims for 103 patients. 73% of them were for generic drugs. CMS names the drug for 64 of them, across 4 drugs with 11 or more claims each, at $4,031 in total drug cost. In 2023, CMS named 60 claims across 3 drugs.
Dr. Constantino's Part D claims by kind of drug, 2024
- Generic177 claims73%
- Brand-name and other64 claims27%
Dr. Constantino'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 Dr. Constantino's Part D claims, 2024
- Opioids5%12 of 241 claims
- Antibiotics14%33 of 241 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: 602024: 647%
Drugs named by CMS: 4 in 2024, 3 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. Jonnel Ramos Constantino takes part in Medicare
Dr. Constantino 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. Jonnel Ramos Constantino received $122 in industry payments in 2017
CMS Open Payments shows 1 general payment to Dr. Constantino from 1 drug or device company in 2017. Food and beverage make up the largest share, 100% of the total. Relypsa, Inc. paid the most, $122.
Companies that paid Dr. Constantino the most, 2017 to 2017
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Jonnel Ramos Constantino graduated from University of the East College of Medicine
Dr. Constantino graduated from University of the East College of Medicine in 1999.
- Medical school
- Board certified in internal medicine
Source: Dmand AI Professional Profile Data
Dr. Jonnel Ramos Constantino accepts plans from 4 insurance carriers
Dr. Constantino is in network with 4 carriers, including Kaiser Permanente, Blue Cross Blue Shield of Massachusetts and HCSC. Medicare plans come from the most carriers, 3. Check the plan with the practice before a visit.
- Kaiser Permanente
- Blue Cross Blue Shield of Massachusetts
- HCSC
- CMS Medicare
Plan types Dr. Constantino accepts, by number of carriers
- Medicare3
- PPO2
- EPO1
- HMO1
- POS1
Source: Dmand AI Insurance Network Data
Sources for Dr. Jonnel Ramos Constantino'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 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) |
| 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. Jonnel Ramos Constantino
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. Jonnel Ramos Constantino's NPI number?
Dr. Jonnel Ramos Constantino's NPI number is 1124246350. It was assigned on April 23, 2007, and it is active in the NPI Registry.
What kind of doctor is Dr. Jonnel Ramos Constantino?
Dr. Jonnel Ramos Constantino is a hospitalist in Fontana, California. The primary specialty in the NPI Registry is Hospitalist Physician (taxonomy code 208M00000X).
Where does Dr. Jonnel Ramos Constantino practice?
Dr. Constantino practices at 9965 Sierra Ave, Fontana, CA 92335. Dr. Constantino's primary practice is Kaiser Permanente - Fontana Medical Center in Fontana, California.
What is Dr. Jonnel Ramos Constantino's office phone number?
The practice phone on file for Dr. Constantino is (909) 427-5000.
What is Dr. Jonnel Ramos Constantino's medical license number?
Dr. Constantino holds California license A89569.
Which hospitals is Dr. Jonnel Ramos Constantino affiliated with?
Dr. Constantino is affiliated with Fontana Medical Center.
What medical group is Dr. Jonnel Ramos Constantino part of?
Dr. Constantino is linked to Southern California Permanente Medical Group.
Does Dr. Jonnel Ramos Constantino accept Medicare?
Yes. CMS data shows Dr. Constantino billed Medicare for 11 services in 2024, and Dr. Constantino accepts Medicare assignment.
How many Medicare patients does Dr. Jonnel Ramos Constantino see?
CMS counts 18 Medicare patients who saw Dr. Constantino in 2024, with an average age of 71.
Is Dr. Jonnel Ramos Constantino board certified?
Yes. Dr. Constantino is board certified in internal medicine by the American Board of Internal Medicine.
Show 6 more questionsShow fewer questions
What services does Dr. Jonnel Ramos Constantino bill to Medicare?
In 2024, Dr. Constantino's most billed Medicare services were hospital inpatient care (99222).
Where did Dr. Jonnel Ramos Constantino go to medical school?
Dr. Constantino graduated from University of the East College of Medicine in 1999.
What drugs does Dr. Jonnel Ramos Constantino prescribe most?
In 2024 Medicare Part D data, Dr. Constantino's most prescribed drugs by claims were Furosemide, Solu-Medrol and Pradaxa.
Has Dr. Jonnel Ramos Constantino received payments from drug or device companies?
CMS Open Payments shows $122 in general payments to Dr. Constantino from 1 company from 2017 to 2017. The largest total came from Relypsa, Inc.
How long has Dr. Jonnel Ramos Constantino been practicing?
Dr. Constantino graduated from medical school in 1999, 27 years ago.
What insurance does Dr. Jonnel Ramos Constantino accept?
Dr. Constantino is in network with 4 carriers, including Kaiser Permanente, Blue Cross Blue Shield of Massachusetts and HCSC. Medicare plans come from the most carriers, 3. Check the plan with the practice before a visit.
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