Quick answers
- Does Ronald A. Mastouri accept Medicare assignment?
- Yes. Medicare's clinician data says Ronald A. Mastouri accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Ronald A. Mastouri see?
- In 2024, CMS data shows 1,285 Original Medicare patients and 2,130 services for Ronald A. Mastouri. This counts Original Medicare only and measures volume, not quality.
- What is Ronald A. Mastouri's NPI number?
- 1134389968. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Ronald A. Mastouri, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 1,285 |
|---|---|
| Services billed to Medicare | 2,130 |
| Different services or procedures | 39 |
| Participating Medicare provider | Yes |
| Average age of these patients | 70 |
Most frequent services
- Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only (93010)849 services
- Ultrasound of heart with color-depicted blood flow, rate, direction and valve function (93306)510 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)94 services
- Exercise or drug-induced heart stress test with electrocardiogram (ecg) with review by physician (93018)91 services
- Exercise or drug-induced heart stress test with electrocardiogram (ecg) with supervision by physician (93016)70 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High blood pressure75%
- High cholesterol73%
- Diabetes46%
- Arthritis45%
- Ischemic heart disease44%
- Chronic kidney disease43%
Hospitals where Ronald A. Mastouri works
Medicare's Facility Affiliation Data lists Ronald A. Mastouri at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Eskenazi HealthIndianapolis, IN · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 150024
- Hancock Regional HospitalGreenfield, IN · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 150037
- Indiana University HealthIndianapolis, IN · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 150056
- Johnson Memorial HospitalFranklin, IN · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 150001
- Union Hospital IncTerre Haute, IN · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 150023
Practice locations
Addresses where Ronald A. Mastouri is enrolled with Medicare (CMS data updated October 2, 2026).
- 1125 W Jefferson StFranklin, IN 46131 (317) 346‑3858
- 1701 N Senate Ave, Heart Station A1089Indianapolis, IN 46202 (317) 924‑8447
- 1701 N Senate BlvdIndianapolis, IN 46202 (888) 484‑3258
- 720 Eskenazi AveIndianapolis, IN 46202 (317) 880‑0000
Group practices
Medicare enrollment lists Ronald A. Mastouri as a member of these groups (CMS data updated October 2, 2026).
- IU Health Medical Group LLC4,462 clinicians in the group
- The Health and Hospital Corporation of Marion County236 clinicians in the group
- Johnson Memorial Hospital39 clinicians in the group
- Indiana University Health Inc37 clinicians in the group
Specialties
Other internal medicine doctors in Franklin
Clinicians with the same Medicare primary specialty in Franklin, IN — not a recommendation.
Other clinicians in IU Health Medical Group LLC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1999 (27 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1134389968 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians