J Clin Gastroenterol
Anti-Infective AgentsClostridioides difficileDiarrhea
Dr. Mark E. Jonas, MD
NPI1144219957
- Medicare services, 2024
- 10,250
- Medicare patients, 2024
- 258
- Part D claims, 2024
- 2,184
- Publications
- 2
- Clinical trials
- 1
- Practice address
- 3000 Mack Road, Fairfield, OH 45014
- Practice phone
- Call (513) 870-7000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Jonas' professional email, personal email and mobile number
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Dr. Mark E. Jonas is a gastroenterologist in Fairfield, Ohio
Dr. Jonas practices at Mercy Health - Fairfield Hospital in Fairfield, Ohio, part of Bon Secours Mercy Health.
Dr. Jonas' NPI, 1144219957, was assigned on October 14, 2005. Dr. Jonas graduated from State University of New York at Stony Brook, School of Medicine in 1990. Dr. Jonas holds Ohio license 35074854.
NPI and contact details
- NPI
- 1144219957NPI Registry (opens in a new tab)
- NPI enumeration date
- October 14, 2005
- NPI status
- Active
- Practice phone
- (513) 870-7000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 62
- Medical school graduation
- 1990
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Dr. Mark E. Jonas practices at Mercy Health - Fairfield Hospital in Fairfield, Ohio
Dr. Jonas' primary practice is Mercy Health - Fairfield Hospital, at 3000 Mack Road, Fairfield, OH 45014 in Butler County. The practice phone is (513) 870-7000.
- Mercy Health - Fairfield Hospital3000 Mack Road, Fairfield, OH 45014 · Butler CountyPhone(513) 870-7000
Source: Dmand AI Affiliation Data
Dr. Mark E. Jonas is affiliated with 2 sites of care and 1 medical group
Dr. Jonas' primary practice is Mercy Health - Fairfield Hospital in Fairfield, Ohio, part of Bon Secours Mercy Health. The medical group on file is Ohio Gastroenterology & Liver Institute (Ohio GI). Dmand AI also links Dr. Jonas 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. Mark E. Jonas' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Jonas practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Mercy Health - Fairfield 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. Mark E. Jonas is one of 692 gastroenterologists in Ohio
Gastroenterology is Dr. Jonas' primary specialty in the NPI Registry, under taxonomy code 207RG0100X. Dr. Jonas is licensed in Ohio.
Specialties and state licenses
- Gastroenterology, OhioPrimary
Gastroenterologists near Dr. Jonas
Counts of gastroenterologists with a Dmand AI profile, by place and practice. Each opens the list.
692gastroenterologists in Ohio
4gastroenterologists in Fairfield
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Mark E. Jonas billed Medicare for 10,250 services in 2024
CMS data shows 10,250 Medicare services from Dr. Jonas across 7 procedure codes in 2024, for 258 Medicare patients. Medicare paid $197,382 for them. Every service was in an office.
Medicare services, 202410,250
Medicare patients258
Paid by Medicare$197,382
Procedure codes7
Dr. Jonas' Medicare services by type, 2023 to 2024
- 2023
- 2024
- Drugs given in the office
- 2023: 5,4002024: 9,90083%
- Office and hospital visits
- 2023: 2832024: 2743%
- Imaging
- 2023: 352024: 4220%
- Tests and treatments
- 2023: 182024: 3489%
Dr. Jonas compared with the Ohio median for gastroenterologists, 2024
- Dr. Jonas
- Ohio median
- Medicare services
- 10,250vs 40425.4 times
- Medicare patients
- 258vs 28810% below
- Part D claims
- 1,954vs 4024.9 times
Medians across 687 gastroenterologists in Ohio with Dmand AI profiles that report each measure.
Dr. Jonas' 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.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Jonas and other gastroenterologists in Ohio.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Mark E. Jonas treated 258 Medicare patients in 2024, average age 73
CMS counts 258 Medicare patients who saw Dr. Jonas in 2024. The largest group is 65 to 74, with 147 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 5% are also on Medicaid. Their average risk score is 1.45, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Jonas' median patient age at 48, with 50% women.
Medicare patients, 2024258
Average age73
Average risk score1.45
Also on Medicaid5%
Dr. Jonas' Medicare patients by age, 2024
Dr. Jonas' Medicare patients by sex, 2024
- Women16062%
- Men9838%
Chronic conditions among Dr. Jonas' Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis54%
- Diabetes31%
- Ischemic heart disease28%
- Mood disorders28%
- Anxiety27%
- Depression26%
Share of Medicare patients with each condition. A patient can have several.
Dr. Jonas' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 48
Patient panel by sex, all payers
- Women50%
- Men50%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Mark E. Jonas wrote 2,184 Medicare Part D claims in 2024
In 2024, Dr. Jonas wrote 2,184 Medicare Part D claims for 428 patients. 83% of them were for generic drugs. CMS names the drug for 1,954 of them, across 44 drugs with 11 or more claims each, at $991,898 in total drug cost. In 2023, CMS named 1,738 claims across 38 drugs.
Part D claims, 20242,184
Drugs named by CMS44
Total drug cost$991,898
Part D patients428
Dr. Jonas' Part D claims by kind of drug, 2024
- Generic1,822 claims83%
- Brand-name and other362 claims17%
Dr. Jonas' 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. Jonas' Part D claims, 2024
- Antibiotics5%117 of 2,184 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: 1,7382024: 1,95412%
Drugs named by CMS: 44 in 2024, 38 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
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Dr. Mark E. Jonas has 2 publications on record
Dmand AI links 2 papers to Dr. Jonas in 2011. Dr. Jonas' most frequent co-author is Guy W. Neff, MBA, MD.
Papers2
Dr. Jonas' most frequent co-authors
Recent publications by Dr. Jonas
See who Dr. Jonas researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Jonas works with, so you can find a warm path to the right gastroenterologists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Mark E. Jonas has worked on 1 clinical trial
Dmand AI links Dr. Jonas to 1 clinical trial. Conditions studied include Non-alcoholic Fatty Liver Disease and Fatty Liver.
Conditions in Dr. Jonas' trials
- Non-alcoholic Fatty Liver Disease
- Fatty Liver
Investigators on the most trials with Dr. Jonas
- Manal F. Abdelmalek, MD1 shared trial
- Stephen H. Caldwell1 shared trial
- Mary E. Rinella, MD1 shared trial
Recent clinical trials with Dr. Jonas
Non-alcoholic Fatty Liver DiseaseFatty LiverJKB-121: 10 mg twice dailyJKB-121: 5 mg twice daily
Sources: Dmand AI Research Linkage; and ClinicalTrials.gov (National Library of Medicine)
Dr. Mark E. Jonas received $10,292 in industry payments from 2016 to 2024
CMS Open Payments shows 728 general payments to Dr. Jonas from 36 drug and device companies from 2016 to 2024. Food and beverage make up the largest share, 97% of the total. Abbvie Inc. paid the most, $2,672.
General payments to Dr. Jonas by program year, 2016 to 2024
General payments to Dr. Jonas by kind, 2016 to 2024
$10.3Kin total
- Food and beverage$9,98097%
- Gifts$2202%
- Education$921%
Companies that paid Dr. Jonas the most, 2016 to 2024
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Mark E. Jonas graduated from State University of New York at Stony Brook, School of Medicine
Dr. Jonas graduated from State University of New York at Stony Brook, School of Medicine in 1990.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Mark E. Jonas'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) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Clinical trials and co-investigators | Dmand AI Research LinkageClinicalTrials.gov (National Library of Medicine) (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 |
| 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. Mark E. Jonas
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. Mark E. Jonas' NPI number?
Dr. Mark E. Jonas' NPI number is 1144219957. It was assigned on October 14, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. Mark E. Jonas?
Dr. Mark E. Jonas is a gastroenterologist in Fairfield, Ohio. The primary specialty in the NPI Registry is Gastroenterology Physician (taxonomy code 207RG0100X).
Where does Dr. Mark E. Jonas practice?
Dr. Jonas practices at 3000 Mack Road, Fairfield, OH 45014. Dr. Jonas' primary practice is Mercy Health - Fairfield Hospital in Fairfield, Ohio, part of Bon Secours Mercy Health. Dmand AI also links Dr. Jonas to 1 group practice or clinic.
What is Dr. Mark E. Jonas' office phone number?
The practice phone on file for Dr. Jonas is (513) 870-7000.
What is Dr. Mark E. Jonas' medical license number?
Dr. Jonas holds Ohio license 35074854.
Which hospitals is Dr. Mark E. Jonas affiliated with?
Dr. Jonas practices at Mercy Health - Fairfield Hospital in Fairfield, Ohio.
What medical group is Dr. Mark E. Jonas part of?
Dr. Jonas is linked to Ohio Gastroenterology & Liver Institute (Ohio GI).
Does Dr. Mark E. Jonas accept Medicare?
Yes. CMS data shows Dr. Jonas billed Medicare for 10,250 services in 2024.
How many Medicare patients does Dr. Mark E. Jonas see?
CMS counts 258 Medicare patients who saw Dr. Jonas in 2024, with an average age of 73.
What services does Dr. Mark E. Jonas bill to Medicare?
In 2024, Dr. Jonas' most billed Medicare services were injected or infused drug (J3380), office visit, established patient (99214) and office visit, established patient (99213).
Show 6 more questionsShow fewer questions
Where did Dr. Mark E. Jonas go to medical school?
Dr. Jonas graduated from State University of New York at Stony Brook, School of Medicine in 1990.
What drugs does Dr. Mark E. Jonas prescribe most?
In 2024 Medicare Part D data, Dr. Jonas' most prescribed drugs by claims were Pantoprazole Sodium, Ursodiol and Famotidine.
Has Dr. Mark E. Jonas received payments from drug or device companies?
CMS Open Payments shows $10,292 in general payments to Dr. Jonas from 36 companies from 2016 to 2024. The largest total came from Abbvie Inc.
How long has Dr. Mark E. Jonas been practicing?
Dr. Jonas graduated from medical school in 1990, 36 years ago.
Does Dr. Mark E. Jonas do research?
Dmand AI links 2 publications to Dr. Jonas. Dr. Jonas has worked on 1 clinical trial.
Who does Dr. Mark E. Jonas publish with?
Dr. Jonas' most frequent co-authors are Guy W. Neff, MBA, MD (2 shared papers).
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