Dr. Jon William Mares, DO
- Medicare services, 2024
- 157
- Medicare patients, 2024
- 65
- Part D claims, 2024
- 132
- Hospital affiliations
- 2
- Industry payments
- $102,624
- Practice address
- 1202 S Tyler Street, Covington, LA 70433
- Practice phone
- Call (985) 898-4000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Mares' 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. Jon William Mares is a nephrologist in Covington, Louisiana
Dr. Mares practices at St. Tammany Parish Hospital in Covington, Louisiana, part of St. Tammany Health System.
Dr. Mares' NPI, 1023375300, was assigned on April 11, 2012. Dr. Mares graduated from Kansas City University of Medicine and Biosciences College of Osteopathic Medicine in 2012. Dr. Mares holds Illinois license 036.151545.
- NPI
- 1023375300NPI Registry (opens in a new tab)
- Medicare PAC ID
- 9234440736
- NPI enumeration date
- April 11, 2012
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (985) 898-4000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 40
- Medical school graduation
- 2012
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Jon William Mares practices at St. Tammany Parish Hospital in Covington, Louisiana
Dr. Mares' primary practice is St. Tammany Parish Hospital, at 1202 S Tyler Street, Covington, LA 70433 in St. Tammany Parish. The practice phone is (985) 898-4000.
- St. Tammany Parish Hospital1202 S Tyler Street, Covington, LA 70433 · St. Tammany ParishPhone(985) 898-4000
Source: Dmand AI Affiliation Data
Dr. Jon William Mares is affiliated with 8 sites of care and 5 medical groups
Dr. Mares' primary practice is St. Tammany Parish Hospital in Covington, Louisiana, part of St. Tammany Health System. Dr. Mares is also affiliated with North Oaks Medical Center. The medical group on file is Northlake Nephrology Institute. Dmand AI also links Dr. Mares to 4 more group practices and clinics, 4 medical groups, 1 clinical lab and 1 dialysis center, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Jon William Mares' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Mares practices, 8 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| St. Tammany Parish Hospital | Available with a free account |
| +7 more sites and 4 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across St. Tammany Health System and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Jon William Mares is one of 196 nephrologists in Louisiana
Nephrology is Dr. Mares' primary specialty in the NPI Registry, under taxonomy code 207RN0300X. Dr. Mares is board certified in internal medicine by the American Board of Internal Medicine. Dmand AI has Dr. Mares' licenses on file in 2 states: Illinois and Texas.
Specialties and state licenses
- Nephrology, IllinoisPrimary
- Internal medicine, Texas
Clinical focus
Dmand AI lists acute kidney failure and chronic kidney disease among the conditions Dr. Mares treats.
Nephrologists near Dr. Mares
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. Jon William Mares billed Medicare for 157 services in 2024
CMS data shows 157 Medicare services from Dr. Mares across 4 procedure codes in 2024, for 65 Medicare patients. Medicare paid $25,987 for them.
Dr. Mares' Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 2332024: 8464%
- Tests and treatments
- 2023: 802024: 739%
Where Dr. Mares' Medicare services took place, 2024
- In an office7346%
- In a facility8454%
Dr. Mares compared with the Louisiana median for nephrologists, 2024
- Dr. Mares
- Louisiana median
- Medicare services
- 157vs 61675% below
- Medicare patients
- 65vs 21269% below
- Part D claims
- 33vs 76996% below
Medians across 192 nephrologists in Louisiana with Dmand AI profiles that report each measure.
Dr. Mares' 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. Mares?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Mares and other nephrologists in Louisiana.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Jon William Mares treated 65 Medicare patients in 2024, average age 66
CMS counts 65 Medicare patients who saw Dr. Mares in 2024. The largest group is under 65, with 24 patients. 75% of them have chronic kidney disease, and 75% have high blood pressure. 49% are also on Medicaid. Their average risk score is 6.96, 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. Mares' median patient age at 66, with 41% women.
Dr. Mares' Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Mares' Medicare patients by sex, 2024
- Women2742%
- Men3858%
Chronic conditions among Dr. Mares' Medicare patients, 2024
- Chronic kidney disease75%
- High blood pressure75%
- High cholesterol74%
- Heart failure66%
- Arthritis55%
- Diabetes51%
- Ischemic heart disease51%
- Atrial fibrillation40%
Share of Medicare patients with each condition. A patient can have several.
Dr. Mares' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 66
Patient panel by sex, all payers
- Women41%
- Men59%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Jon William Mares wrote 132 Medicare Part D claims in 2024
In 2024, Dr. Mares wrote 132 Medicare Part D claims for 31 patients. 99% of them were for generic drugs. CMS names the drug for 33 of them, across 2 drugs with 11 or more claims each, at $376 in total drug cost. In 2023, CMS named 69 claims across 4 drugs.
Dr. Mares' Part D claims by kind of drug, 2024
- Generic131 claims99%
- Brand-name and other1 claims1%
Dr. Mares' 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.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 692024: 3352%
Drugs named by CMS: 2 in 2024, 4 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. Jon William Mares takes part in Medicare
Dr. Mares 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. Jon William Mares received $102,624 in industry payments from 2016 to 2025
CMS Open Payments shows 172 general payments to Dr. Mares from 18 drug and device companies from 2016 to 2025. Speaker and faculty fees make up the largest share, 91% of the total. Bayer HealthCare Pharmaceuticals Inc. paid the most, $100,565.
General payments to Dr. Mares by program year, 2016 to 2025
General payments to Dr. Mares by kind, 2016 to 2025
- Speaker and faculty fees$93,46591%
- Food and beverage$6,7467%
- Travel and lodging$2,2042%
- Education$2080%
Companies that paid Dr. Mares the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Jon William Mares graduated from Kansas City University of Medicine and Biosciences College of Osteopathic Medicine
Dr. Mares graduated from Kansas City University of Medicine and Biosciences College of Osteopathic Medicine in 2012.
- Medical school
- Board certified in internal medicine
- Board certified in nephrology
- Board certified in 2020 - 2023
- Board certified in 2013 - 2015
- Board certified in 2019 - 2025
- Board certified in 2019 - 2021
- Board certified in 2015 - 2027
Source: Dmand AI Professional Profile Data
Dr. Jon William Mares accepts plans from 19 insurance carriers
Dr. Mares is in network with 19 carriers, including Aetna, Blue Cross Blue Shield of Michigan and United Healthcare. PPO plans come from the most carriers, 13. Check the plan with the practice before a visit.
- Aetna
- Blue Cross Blue Shield of Michigan
- United Healthcare
- Elevance
- HCSC
- Alliant Health Plans
- Aspirus Health Plan
- Blue Cross Blue Shield of Massachusetts
- +11 more carriersWith a free account
Plan types Dr. Mares accepts, by number of carriers
- PPO13
- Medicare8
- HMO7
- POS5
- EPO4
- Medicaid1
Source: Dmand AI Insurance Network Data
Sources for Dr. Jon William Mares'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) |
| 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. Jon William Mares
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. Jon William Mares' NPI number?
Dr. Jon William Mares' NPI number is 1023375300. It was assigned on April 11, 2012, and it is active in the NPI Registry.
What kind of doctor is Dr. Jon William Mares?
Dr. Jon William Mares is a nephrologist in Covington, Louisiana. The primary specialty in the NPI Registry is Nephrology Physician (taxonomy code 207RN0300X).
Where does Dr. Jon William Mares practice?
Dr. Mares practices at 1202 S Tyler Street, Covington, LA 70433. Dr. Mares' primary practice is St. Tammany Parish Hospital in Covington, Louisiana, part of St. Tammany Health System. Dmand AI also links Dr. Mares to 4 group practices and clinics, 4 medical groups, 1 clinical lab and 1 dialysis center.
What is Dr. Jon William Mares' office phone number?
The practice phone on file for Dr. Mares is (985) 898-4000.
What is Dr. Jon William Mares' medical license number?
Dr. Mares holds Illinois license 036.151545, one of the licenses on file in 2 states.
Which states has Dr. Jon William Mares been licensed in?
Dmand AI has state licenses on file for Dr. Mares in Illinois and Texas.
Which hospitals is Dr. Jon William Mares affiliated with?
Dr. Mares practices at St. Tammany Parish Hospital in Covington, Louisiana. Dr. Mares is also affiliated with North Oaks Medical Center.
What medical group is Dr. Jon William Mares part of?
Dr. Mares is linked to Northlake Nephrology Institute. Dmand AI links Dr. Mares to 4 more medical groups.
Does Dr. Jon William Mares accept Medicare?
Yes. CMS data shows Dr. Mares billed Medicare for 157 services in 2024, and Dr. Mares accepts Medicare assignment.
How many Medicare patients does Dr. Jon William Mares see?
CMS counts 65 Medicare patients who saw Dr. Mares in 2024, with an average age of 66.
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Is Dr. Jon William Mares board certified?
Yes. Dr. Mares is board certified in internal medicine by the American Board of Internal Medicine.
What services does Dr. Jon William Mares bill to Medicare?
In 2024, Dr. Mares' most billed Medicare services were dialysis (90960), hospital inpatient care (99232) and hospital inpatient care (99233).
Where did Dr. Jon William Mares go to medical school?
Dr. Mares graduated from Kansas City University of Medicine and Biosciences College of Osteopathic Medicine in 2012.
What drugs does Dr. Jon William Mares prescribe most?
In 2024 Medicare Part D data, Dr. Mares' most prescribed drugs by claims were Amlodipine Besylate and Olmesartan Medoxomil.
Has Dr. Jon William Mares received payments from drug or device companies?
CMS Open Payments shows $102,624 in general payments to Dr. Mares from 18 companies from 2016 to 2025. The largest total came from Bayer HealthCare Pharmaceuticals Inc.
How long has Dr. Jon William Mares been practicing?
Dr. Mares graduated from medical school in 2012, 14 years ago.
What insurance does Dr. Jon William Mares accept?
Dr. Mares is in network with 19 carriers, including Aetna, Blue Cross Blue Shield of Michigan and United Healthcare. PPO plans come from the most carriers, 13. Check the plan with the practice before a visit.
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