Quick answers
- Does Mary K. Halloran accept Medicare assignment?
- Yes. Medicare's clinician data says Mary K. Halloran 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 K. Halloran see?
- In 2024, CMS data shows 139 Original Medicare patients and 467 services for Mary K. Halloran. This counts Original Medicare only and measures volume, not quality.
- What is Mary K. Halloran's NPI number?
- 1396989059. 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 K. Halloran, 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 | 139 |
|---|---|
| Services billed to Medicare | 467 |
| Different services or procedures | 24 |
| Participating Medicare provider | Yes |
| Average age of these patients | 81 |
Most frequent services
- Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes (99231)99 services
- Hospital discharge day management, 30 minutes or less (99238)79 services
- Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)63 services
- Subsequent nursing facility care with straightforward level of medical decision making, per day, if using time, 20 minutes or more (99308)50 services
- Nursing facility discharge day management, 30 minutes or less (99315)46 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 cholesterol63%
- Arthritis47%
- Heart failure44%
- Chronic kidney disease42%
- Atrial fibrillation42%
Hospitals where Mary K. Halloran works
Medicare's Facility Affiliation Data lists Mary K. Halloran 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.
- Adirondack Medical Center - Saranac LakeSaranac Lake, NY · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 330079
- Elizabethtown Community HospitalElizabethtown, NY · Critical Access Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 331302
- The University of Vermont Health Network - ChamplPlattsburgh, NY · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 330250
- University of Vermont - Fletcher Allen Health CareBurlington, VT · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 470003
Practice locations
Addresses where Mary K. Halloran is enrolled with Medicare (CMS data updated October 2, 2026).
- 75 Park StElizabethtown, NY 12932 (518) 673‑6377
Group practices
Medicare enrollment lists Mary K. Halloran as a member of this group (CMS data updated October 2, 2026).
- Elizabethtown Community Hospital59 clinicians in the group
Specialties
- Family Practiceprimary
Other family doctors in New York
Clinicians with the same Medicare primary specialty in New York — not a recommendation.
Other clinicians in Elizabethtown Community Hospital
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Pennsylvania State University College Of Medicine |
| Graduation year | 2009 (17 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1396989059 |
| 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