Dr. Mark E. Ritter, MD
- Medicare services, 2024
- 541
- Medicare patients, 2024
- 221
- Part D claims, 2024
- 7,933
- MIPS score, 2024
- 91
- Hospital affiliations
- 3
- Practice address
- 85 East US Hwy 6, Valparaiso, IN 46383
- Practice phone
- Call (219) 983-8300
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Ritter'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. Mark E. Ritter is an internist in Valparaiso, Indiana
Dr. Ritter practices at Northwest Health - Porter in Valparaiso, Indiana, part of Community Health Systems.
Dr. Ritter's NPI, 1609939511, was assigned on December 19, 2006. Dr. Ritter graduated from Indiana University School of Medicine in 1986. Dr. Ritter holds Indiana license 01037402A.
- NPI
- 1609939511NPI Registry (opens in a new tab)
- Medicare PAC ID
- 4587799093
- NPI enumeration date
- December 19, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (219) 983-8300
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 66
- Medical school graduation
- 1986
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Mark E. Ritter practices at Northwest Health - Porter in Valparaiso, Indiana
Dr. Ritter's primary practice is Northwest Health - Porter, at 85 East US Hwy 6, Valparaiso, IN 46383 in Porter County. The practice phone is (219) 983-8300.
- Northwest Health - Porter85 East US Hwy 6, Valparaiso, IN 46383 · Porter CountyPhone(219) 983-8300
Source: Dmand AI Affiliation Data
Dr. Mark E. Ritter is affiliated with 6 sites of care and 1 medical group
Dr. Ritter's primary practice is Northwest Health - Porter in Valparaiso, Indiana, part of Community Health Systems. Dr. Ritter is also affiliated with St. Mary Medical Center. The medical group on file is Northwest Medical Group. Dmand AI also links Dr. Ritter to 1 more hospital, 2 home health agencies and 1 group practice or clinic, 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. Mark E. Ritter's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Ritter practices, 6 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Northwest Health - Porter | Available with a free account |
| +5 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Mark E. Ritter is one of 1,987 internists in Indiana
Internal medicine is Dr. Ritter's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Ritter is licensed in Indiana.
Specialties and state licenses
- Internal medicine, IndianaPrimary
Internists near Dr. Ritter
Counts of internists 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. Mark E. Ritter billed Medicare for 541 services in 2024
CMS data shows 541 Medicare services from Dr. Ritter across 6 procedure codes in 2024, for 221 Medicare patients. Medicare paid $48,133 for them. Every service was in an office.
Dr. Ritter's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 4362024: 4028%
- Other services
- 2023: 1132024: 13923%
- Tests and treatments
- 2023: 222024: 0100%
Dr. Ritter compared with the Indiana median for internists, 2024
- Dr. Ritter
- Indiana median
- Medicare services
- 541vs 520Close to median
- Medicare patients
- 221vs 212Close to median
- Part D claims
- 7,276vs 15945.8 times
Medians across 1,948 internists in Indiana with Dmand AI profiles that report each measure.
Dr. Ritter'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.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Ritter and other internists in Indiana.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Mark E. Ritter treated 221 Medicare patients in 2024, average age 74
CMS counts 221 Medicare patients who saw Dr. Ritter in 2024. The largest group is 65 to 74, with 109 patients. 75% of them have high cholesterol, and 73% have high blood pressure. Their average risk score is 1.11, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Ritter's median patient age at 69, with 40% women.
Dr. Ritter's Medicare patients by age, 2024
Dr. Ritter's Medicare patients by sex, 2024
- Women7936%
- Men14264%
Chronic conditions among Dr. Ritter's Medicare patients, 2024
- High cholesterol75%
- High blood pressure73%
- Arthritis39%
- Diabetes31%
- Ischemic heart disease30%
- Chronic kidney disease22%
- COPD20%
- Atrial fibrillation18%
Share of Medicare patients with each condition. A patient can have several.
Dr. Ritter'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
- Women40%
- Men59%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Mark E. Ritter wrote 7,933 Medicare Part D claims in 2024
In 2024, Dr. Ritter wrote 7,933 Medicare Part D claims for 698 patients. 87% of them were for generic drugs. CMS names the drug for 7,276 of them, across 106 drugs with 11 or more claims each, at $879,318 in total drug cost. In 2023, CMS named 6,559 claims across 100 drugs.
Dr. Ritter's Part D claims by kind of drug, 2024
- Generic6,887 claims87%
- Brand-name923 claims12%
- Other123 claims2%
Dr. Ritter'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. Ritter's Part D claims, 2024
- Opioids0%32 of 7,933 claims
- Antibiotics1%115 of 7,933 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: 6,5592024: 7,27611%
Drugs named by CMS: 106 in 2024, 100 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
Dr. Mark E. Ritter scored 91 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 91 out of 100 for Dr. Ritter for performance year 2024, reported through an alternative payment model (APM). Dr. Ritter accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Dr. Ritter's MIPS scores, performance year 2024
- 91of 100Final score
- 76.2of 100Quality
- 100of 100Promoting Interoperability
- 40of 100Improvement Activities
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026
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Dr. Mark E. Ritter received $827 in industry payments from 2016 to 2025
CMS Open Payments shows 35 general payments to Dr. Ritter from 14 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 100% of the total. Stryker Corporation paid the most, $194.
General payments to Dr. Ritter by program year, 2016 to 2025
Companies that paid Dr. Ritter 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. Mark E. Ritter graduated from Indiana University School of Medicine
Dr. Ritter graduated from Indiana University School of Medicine in 1986.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Mark E. Ritter'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)Clinician Public Reporting: Overall MIPS Performance (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 |
| 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. Ritter
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. Ritter's NPI number?
Dr. Mark E. Ritter's NPI number is 1609939511. It was assigned on December 19, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Mark E. Ritter?
Dr. Mark E. Ritter is an internist in Valparaiso, Indiana. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Mark E. Ritter practice?
Dr. Ritter practices at 85 East US Hwy 6, Valparaiso, IN 46383. Dr. Ritter's primary practice is Northwest Health - Porter in Valparaiso, Indiana, part of Community Health Systems. Dmand AI also links Dr. Ritter to 1 hospital, 2 home health agencies and 1 group practice or clinic.
What is Dr. Mark E. Ritter's office phone number?
The practice phone on file for Dr. Ritter is (219) 983-8300.
What is Dr. Mark E. Ritter's medical license number?
Dr. Ritter holds Indiana license 01037402A.
Which hospitals is Dr. Mark E. Ritter affiliated with?
Dr. Ritter practices at Northwest Health - Porter in Valparaiso, Indiana. Dr. Ritter is also affiliated with St. Mary Medical Center. Dmand AI links Dr. Ritter to 1 more hospital.
What medical group is Dr. Mark E. Ritter part of?
Dr. Ritter is linked to Northwest Medical Group.
Does Dr. Mark E. Ritter accept Medicare?
Yes. CMS data shows Dr. Ritter billed Medicare for 541 services in 2024, and Dr. Ritter accepts Medicare assignment.
What is Dr. Mark E. Ritter's MIPS score?
Dr. Ritter's MIPS final score for performance year 2024 is 91 out of 100, reported through an alternative payment model (APM).
How many Medicare patients does Dr. Mark E. Ritter see?
CMS counts 221 Medicare patients who saw Dr. Ritter in 2024, with an average age of 74.
Show 5 more questionsShow fewer questions
What services does Dr. Mark E. Ritter bill to Medicare?
In 2024, Dr. Ritter's most billed Medicare services were office visit, established patient (99214), medicare service (G0439) and care management and other visits (99443).
Where did Dr. Mark E. Ritter go to medical school?
Dr. Ritter graduated from Indiana University School of Medicine in 1986.
What drugs does Dr. Mark E. Ritter prescribe most?
In 2024 Medicare Part D data, Dr. Ritter's most prescribed drugs by claims were Atorvastatin Calcium, Amlodipine Besylate and Rosuvastatin Calcium.
Has Dr. Mark E. Ritter received payments from drug or device companies?
CMS Open Payments shows $827 in general payments to Dr. Ritter from 14 companies from 2016 to 2025. The largest total came from Stryker Corporation.
How long has Dr. Mark E. Ritter been practicing?
Dr. Ritter graduated from medical school in 1986, 40 years ago.
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