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JON WILLIAM MARES D.O.
NPI 1023375300
Internal Medicine - Nephrology in Covington, LA

Active since April 11, 2012PECOS EnrolledAccepts Medicare Assignment
1970 N HIGHWAY 190, COVINGTON, LA 70433(985) 867-8585(985) 867-3644 Get Directions Write a Review

NPPES record last updated: September 17, 2025. Verified against the NPPES registry weekly; last sync: August 09, 2026.

Record update history: Sep 17, 2025, Mar 30, 2016 (2 updates tracked since 2016).

About Jon William Mares D.o. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

JON WILLIAM MARES D.O. (NPI 1023375300) is an individual nephrology provider in Covington, Louisiana, licensed in Illinois (036.151545) and active in the NPI registry since April 2012. He is enrolled in Medicare PECOS, is affiliated with North Oaks Medical Center, and is a graduate of Kansas City University Of Physicians And Surgeons (2012).

NPPES Registry Identity

NPI1023375300
Entity TypeIndividualMale
Primary Taxonomy207RN0300X
Provider Legal NameJON WILLIAM MARESCredential: D.O.
Location Address1970 N HIGHWAY 190Covington, LA 70433-5364
Mailing AddressPo Box 3370Covington, LA 70434-3370 · (985) 867-8585 · Fax (985) 867-3644
Phone(985) 867-8585
Fax(985) 867-3644
Sole ProprietorNo
Medical School CMSKansas City University Of Physicians And SurgeonsGraduated 2012
Enumeration DateApril 11, 2012
Last NPPES UpdateSeptember 17, 20252 updates tracked since enumeration
NPPES CertifiedSeptember 17, 2025
✔ NPI 1023375300 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal Medicine · NephrologyAllopathic & Osteopathic Physicians
Taxonomy Code207RN0300X
License✔ Licensed in IL · 036.151545
Definition
An internist who treats disorders of the kidney, high blood pressure, fluid and mineral balance and dialysis of body wastes when the kidneys do not function. This specialist consults with surgeons about kidney transplantation.
Also ListedInternal MedicineTaxonomy 207R00000X · License Q6769 (TX)
1970 N HIGHWAY 190, Covington, LA 70433
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Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter from Arkansas Health & Wellness, Ambetter from Louisiana Healthcare Connections, Ambetter from Magnolia Health and more.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Jon William Mares D.o. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID9234440736
PECOS Enrollment IDI20210713001349
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Areas of Expertise CMS Part B claims 4

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Dialysis services, 4 or more physician visits per month (20 years or older) 90960
Dialysis is a treatment that filters and purifies your blood using a machine. It helps keep your fluids and electrolytes in balance when the kidneys can't do their job. This service includes 4 or more visits per month with a physician to monitor your health and adjust your treatment as needed.
73 services28 patients
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes 99232
Follow-up hospital inpatient care involves daily check-ups while you're admitted in the hospital. Typically, a healthcare provider spends about 25 minutes each day reviewing your condition, adjusting treatment if needed, and answering any questions you might have.
39 services19 patients
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes 99233
Follow-up hospital inpatient care per day typically involves a 35-minute check-up by your healthcare provider. This service includes monitoring your health progress, adjusting your treatment plan if needed, and answering any questions you may have about your condition or care.
33 services15 patients
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes 99223
Initial hospital inpatient care per day, typically 70 minutes, refers to the daily medical service provided to patients admitted to the hospital. This includes a comprehensive evaluation, diagnosis, treatment plan, and monitoring of your health condition. It ensures your well-being during your hospital stay.
12 services11 patients

Hospital Affiliations CMS Care Compare

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

North Oaks Medical Center

Acute Care Hospitals · Hammond, LA
2/5 CMS rating
OwnershipGovernment - Hospital District or Authority
CMS Certification Number190015
Location15790 Paul Vega MD DriveHammond, LA 70403 · Tangipahoa County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 70433 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$124.60 typical visit price
range $53.43 – $164.73
Typical copayment $31.15 (range $13.35 – $41.18)
Most-billed visit code 99204
Established Patient
$95.09 typical visit price
range $16.64 – $133.62
Typical copayment $23.77 (range $4.16 – $33.40)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

SLR HOLDINGS LLC
Internal Medicine
1970 N HIGHWAY 190
COVINGTON, LA 70433
St. Tammany Parish (985) 256-5599
KATY SCHULTHESS APRN-FNP
Nurse Practitioner (Family)
1970 N HIGHWAY 190
COVINGTON, LA 70433
St. Tammany Parish (985) 867-8585
FRANK J ARENA MD, APMC
Internal Medicine (Cardiovascular Disease)
1970 N HIGHWAY 190, SUITE 100
COVINGTON, LA 70433
St. Tammany Parish (985) 867-8585
MRS. CHELSEA JAIDE WOOD FNP
Nurse Practitioner (Family)
1970 N HIGHWAY 190
COVINGTON, LA 70433
St. Tammany Parish (985) 867-8585
BRITTANY LOUPE FNP
Nurse Practitioner (Family)
1970 N HIGHWAY 190
COVINGTON, LA 70433
St. Tammany Parish (985) 867-8585
KRYSTAL BOSIO APRN
Nurse Practitioner (Family)
1970 N HIGHWAY 190
COVINGTON, LA 70433
St. Tammany Parish (985) 867-8585
PETER VAN MD
Internal Medicine (Nephrology)
1970 N HIGHWAY 190, SUITE 100
COVINGTON, LA 70433
St. Tammany Parish (985) 867-8585
KASSIDY B WALL FNP
Nurse Practitioner (Family)
1970 N HIGHWAY 190
COVINGTON, LA 70433
St. Tammany Parish (985) 400-5988

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Jon Mares's NPI number?

The NPI number for Jon Mares is 1023375300. It was assigned to this individual provider in the NPPES registry on April 11, 2012.

Where is Jon Mares located?

Jon Mares practices at 1970 N Highway 190, Covington, LA 70433. The listed phone number is (985) 867-8585.

What is Jon Mares's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Nephrology, with taxonomy code 207RN0300X.

Is Jon Mares enrolled in Medicare?

Yes. Jon Mares is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

What insurance does Jon Mares accept?

Health plans from Ambetter from Arkansas Health & Wellness, Ambetter from Louisiana Healthcare Connections, Ambetter from Magnolia Health, Ambetter from Superior HealthPlan and Blue Cross and Blue Shield of Louisiana and 2 other insurers list Jon Mares as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

Is Jon Mares affiliated with any hospitals?

According to CMS data, Jon Mares is affiliated with North Oaks Medical Center.

When was this NPI record last updated?

The NPPES record for Jon Mares was last updated on September 17, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 10 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.