Quick answers
- Does Anna Leszczynski accept Medicare assignment?
- Yes. Medicare's clinician data says Anna Leszczynski 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 Anna Leszczynski see?
- In 2024, CMS data shows 271 Original Medicare patients and 400 services for Anna Leszczynski. This counts Original Medicare only and measures volume, not quality.
- What is Anna Leszczynski's NPI number?
- 1942566732. 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 Anna Leszczynski, 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 | 271 |
|---|---|
| Services billed to Medicare | 400 |
| Different services or procedures | 32 |
| Participating Medicare provider | Yes |
| Average age of these patients | 74 |
Most frequent services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)68 services
- Moderate sedation services provided by the same physician or other qualified health care professional performing a gastrointestinal endoscopic service that sedation supports, requiring the presence of an independent trained observer to assist in the monito (G0500)57 services
- Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)46 services
- Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)36 services
- Biopsy of large bowel using a flexible endoscope (45380)32 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 pressure72%
- Arthritis47%
- Chronic kidney disease30%
- Anxiety29%
- Ischemic heart disease28%
Hospitals where Anna Leszczynski works
Medicare's Facility Affiliation Data lists Anna Leszczynski 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.
- Beth Israel Deaconess Medical CenterBoston, MA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 220086
- Lahey Hospital & Medical Center, BurlingtonBurlington, MA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 220171
- Northeast Hospital CorporationBeverly, MA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 220033
- Winchester HospitalWinchester, MA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 220105
Practice locations
Addresses where Anna Leszczynski is enrolled with Medicare (CMS data updated October 2, 2026).
- 29 Mall RdBurlington, MA 01805
- 41 Mall RdBurlington, MA 01805
Group practices
Medicare enrollment lists Anna Leszczynski as a member of this group (CMS data updated October 2, 2026).
- Lahey Clinic Inc1,381 clinicians in the group
Specialties
- Gastroenterologyprimary
Other gastroenterologists in Burlington
Clinicians with the same Medicare primary specialty in Burlington, MA — not a recommendation.
Other clinicians in Lahey Clinic Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | New York University School Of Medicine |
| Graduation year | 2012 (14 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1942566732 |
| 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