Mark E. Ritter, M.D.
Internal Medicine Physician · Chesterton, IN
Mark E. Ritter, M.D. is an internal medicine physician with a practice address in Chesterton, Indiana, and NPI 1609939511, issued on Dec 19, 2006. Check the license (Indiana 01037402A, as entered in NPPES) on the Medical Licensing Board of Indiana; the Medicare figures below come from public CMS files.
- Name
- Mark E. Ritter
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 01037402A IN
Self-reported in NPPES; status is on the state search - Practice location
- 2022 Kelle Dr, Chesterton, IN 46304
- Phone
- (219) 395-2200
- Enumerated
- Dec 19, 2006
- Record last updated
- Sep 14, 2020 (not updated in 6 years: call before relying on the address or phone)
- Fax
- (219) 983-1837
- Medicare enrollment
- Enrolled (PECOS I20100322000763); accepts Medicare assignment
- Medical or professional school
- Indiana University School Of Medicine, 1986
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,109 in Indiana → Look up another NPI →
Also registered at 2022 Kelle Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Angela Wheeler, M.D.Sports Medicine (Family Medicine) Physician1932262847
Verify Mark E. Ritter in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Licensing Board of Indiana
Search for license 01037402ACheck the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.5 times the Medicare Part D claims of the average internal medicine physician in 2024
7,933 Medicare Part D claims for 698 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 12% of claims. 32 claims were for opioids.
Most prescribed
- Atorvastatin Calcium653 claims
- Amlodipine Besylate575 claims
- Rosuvastatin Calcium532 claims
- Lisinopril382 claims
- Pantoprazole Sodium285 claims
- Metformin Hcl283 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The MIPS final score for 2023 (Medicare payment program): 88 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $38.15
1 payment: food and beverage; the largest payer was Stryker Corporation. The 50,334 providers of this specialty with any payment received $1,303.06 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through 2 group practices
- Chesterton Physical Therapy IncChesterton, IN
- Porter Physician Services LLCChesterton, IN
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mark E. Ritter among 2,109 internal medicine physician records in Indiana
Mark E. Ritter, M.D. is one of 2,109 internal medicine physician records with a practice address in Indiana. 85% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 13% of them.
- NPI issued2006 · 13% of these records are older, 54% newer
- In a Medicare fileYes · 85% of these records are
- In the CMS Doctors and Clinicians fileYes · 69% of these records are
- Graduated1986 · median 2005 among the 1,448 with a school on file
- Record last updated2020 · 43% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Indiana practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
5 internal medicine physician records list a practice address in Chesterton
They are 5 of the 570 NPPES records with a practice address in Chesterton, and 2,109 internal medicine physician records in Indiana.
All 2,109 in Indiana → Every provider in Chesterton → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Jamie Chin-Theodorou, MDChesterton, IN 463041326439241
- Sumedha Dhar, M.DChesterton, IN 463041811204266
- Anne Hollingsworth, DOChesterton, IN 463041902891542
- Prasanthi Tummuru, M.D.Chesterton, IN 463041386889921
- Jose Agusti, M.D.Winfield, IN 463071033192604
- Hayssam Kadah, M.D.Crown Point, IN 463071427167584
- Bernardo Lucena, MDCrown Point, IN 463071356391676
- Anastas Mukoski, MDCrown Point, IN 463071144334301
Common questions
What is Mark E. Ritter, M.D.'s NPI number?
Mark E. Ritter, M.D.'s National Provider Identifier (NPI) is 1609939511, issued on Dec 19, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mark E. Ritter, M.D. located?
The NPPES record lists a practice address at 2022 Kelle Dr, Chesterton, IN, 46304. Phone: (219) 395-2200. Providers update this record themselves, so call before visiting.
How can I verify Mark E. Ritter, M.D.'s license?
NPPES lists Indiana license number 01037402A, as entered by the provider. Search the Medical Licensing Board of Indiana at https://www.in.gov/pla/professions/physicians-home/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Mark E. Ritter, M.D. prescribe under Medicare Part D?
In 2024, Mark E. Ritter, M.D. had 7,933 Medicare Part D claims for 698 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Mark E. Ritter, M.D.'s MIPS final score?
The 2023 MIPS final score is 88 of 100. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.