Quick answers
- Does Mary A. Stefanyszyn accept Medicare assignment?
- Yes. Medicare's clinician data says Mary A. Stefanyszyn 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 Mary A. Stefanyszyn see?
- In 2024, CMS data shows 399 Original Medicare patients and 10,264 services for Mary A. Stefanyszyn. This counts Original Medicare only and measures volume, not quality.
- What is Mary A. Stefanyszyn's NPI number?
- 1245239318. 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 Mary A. Stefanyszyn, 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 | 399 |
|---|---|
| Services billed to Medicare | 10,264 |
| Different services or procedures | 46 |
| Participating Medicare provider | Yes |
| Average age of these patients | 75 |
Most frequent services
- Injection, incobotulinumtoxin a, 1 unit (J0588)9,200 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)341 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)238 services
- Injection of chemical for paralysis of nerve muscles on side of face (64612)92 services
- Photography of content of eyes (92285)52 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 cholesterol75%
- High blood pressure63%
- Arthritis58%
- Osteoporosis34%
- Anxiety32%
- Depression23%
Practice locations
Addresses where Mary A. Stefanyszyn is enrolled with Medicare (CMS data updated October 2, 2026).
- 100 E Lancaster Ave, Suite 54Wynnewood, PA 19096 (610) 649‑1970
- 840 Walnut StPhiladelphia, PA 19107 (610) 649‑1970
Group practices
Medicare enrollment lists Mary A. Stefanyszyn as a member of this group (CMS data updated October 2, 2026).
- Annesley Flanagan Fischer Stefanyszyn and Associates5 clinicians in the group
Specialties
Other ophthalmologists in Wynnewood
Clinicians with the same Medicare primary specialty in Wynnewood, PA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Harvard Medical School |
| Graduation year | 1978 (48 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1245239318 |
| 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
- 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