Quick answers
- Does Lou Mastrine accept Medicare assignment?
- Yes. Medicare's clinician data says Lou Mastrine 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 Lou Mastrine see?
- In 2024, CMS data shows 970 Original Medicare patients and 2,859 services for Lou Mastrine. This counts Original Medicare only and measures volume, not quality.
- What is Lou Mastrine's NPI number?
- 1891955308. 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 Lou Mastrine, 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 | 970 |
|---|---|
| Services billed to Medicare | 2,859 |
| Different services or procedures | 66 |
| Participating Medicare provider | Yes |
| Average age of these patients | 75 |
Most frequent services
- Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only (93010)594 services
- Evaluation of single, dual, multiple lead or leadless pacemaker system or implantable defibrillator system, remote up to 90 days (93296)502 services
- Evaluation of single, dual, multiple lead or leadless pacemaker system, remote up to 90 days (93294)348 services
- Evaluation of implantable heart and blood vessel monitoring system, remote up to 30 days (93297)294 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)199 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 cholesterol75%
- Arthritis53%
- Ischemic heart disease53%
- Atrial fibrillation42%
- Heart failure41%
Hospitals where Lou Mastrine works
Medicare's Facility Affiliation Data lists Lou Mastrine 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.
- Chan Soon- Shiong Medical Center at WindberWindber, PA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 390112
- Conemaugh Memorial Medical CenterJohnstown, PA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 390110
- Conemaugh Meyersdale Medical CenterMeyersdale, PA · Critical Access Hospital · Emergency services: listed by Medicare · CCN 391302
Practice locations
Addresses where Lou Mastrine is enrolled with Medicare (CMS data updated October 2, 2026).
- 1 Tech Park DrJohnstown, PA 15901 (814) 475‑8700
- 1086 Franklin StJohnstown, PA 15905 (814) 534‑9812
Group practices
Medicare enrollment lists Lou Mastrine as a member of this group (CMS data updated October 2, 2026).
- DLP Conemaugh Physician Practices LLC293 clinicians in the group
Specialties
Find other Cardiovascular Disease (Cardiology) doctors in Pennsylvania →
Other cardiologists in Johnstown
Clinicians with the same Medicare primary specialty in Johnstown, PA — not a recommendation.
Other clinicians in DLP Conemaugh Physician Practices LLC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | DO |
|---|---|
| Graduation year | 2007 (19 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1891955308 |
| 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