Quick answers
- Does Anastasia Grebeck accept Medicare assignment?
- Yes. Medicare's clinician data says Anastasia Grebeck 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 Anastasia Grebeck see?
- In 2024, CMS data shows 325 Original Medicare patients and 414 services for Anastasia Grebeck. This counts Original Medicare only and measures volume, not quality.
- What is Anastasia Grebeck's NPI number?
- 1972081164. 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 Anastasia Grebeck, 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 | 325 |
|---|---|
| Services billed to Medicare | 414 |
| Different services or procedures | 11 |
| Participating Medicare provider | Yes |
| Average age of these patients | 75 |
Most frequent services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)149 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)147 services
- New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)61 services
- New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more (99203)34 services
- Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more (99212)11 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 pressure69%
- Arthritis54%
- Ischemic heart disease34%
- Anxiety28%
- Osteoporosis28%
Hospitals where Anastasia Grebeck works
Medicare's Facility Affiliation Data lists Anastasia Grebeck 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.
- Bryn Mawr HospitalBryn Mawr, PA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 390139
- Chester County HospitalWest Chester, PA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 390179
- Paoli HospitalPaoli, PA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 390153
- Riddle Memorial HospitalMedia, PA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 390222
Practice locations
Addresses where Anastasia Grebeck is enrolled with Medicare (CMS data updated October 2, 2026).
- 100 E Lancaster Ave, Suite 252Wynnewood, PA 19096 (610) 896‑7360
- 2112 Harrisburg Pike, Suite 202Lancaster, PA 17601 (717) 869‑4600
- 650 Carnegie Blvd, Suite 100Malvern, PA 19355 (610) 644‑6755
Group practices
Medicare enrollment lists Anastasia Grebeck as a member of this group (CMS data updated October 2, 2026).
- Regional Gastroenterology Associates of Lancaster, Ltd.244 clinicians in the group
Specialties
- Physician Assistantprimary
Other physician assistants in Wynnewood
Clinicians with the same Medicare primary specialty in Wynnewood, PA — not a recommendation.
Other clinicians in Regional Gastroenterology Associates of Lancaster, Ltd.
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | PA |
|---|---|
| Graduation year | 2018 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1972081164 |
| 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