Quick answers
- Does Alexi P. Zemsky accept Medicare assignment?
- Yes. Medicare's clinician data says Alexi P. Zemsky 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 Alexi P. Zemsky see?
- In 2024, CMS data shows 794 Original Medicare patients and 1,619 services for Alexi P. Zemsky. This counts Original Medicare only and measures volume, not quality.
- What is Alexi P. Zemsky's NPI number?
- 1598944928. 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 Alexi P. Zemsky, 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 | 794 |
|---|---|
| Services billed to Medicare | 1,619 |
| Different services or procedures | 70 |
| Participating Medicare provider | Yes |
| Average age of these patients | 76 |
Most frequent services
- Evaluation of single, dual, multiple lead or leadless pacemaker system or implantable defibrillator system, remote up to 90 days (93296)362 services
- Evaluation of single, dual, or multiple lead implantable defibrillator system, remote up to 90 days (93295)225 services
- Evaluation of single, dual, multiple lead or leadless pacemaker system, remote up to 90 days (93294)142 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)121 services
- Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only (93010)114 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%
- Atrial fibrillation69%
- Heart failure61%
- Ischemic heart disease47%
- Arthritis38%
Hospitals where Alexi P. Zemsky works
Medicare's Facility Affiliation Data lists Alexi P. Zemsky 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.
- Providence Hood River Memorial HospitalHood River, OR · Critical Access Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 381318
- Providence Milwaukie HospitalMilwaukie, OR · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: not listed by Medicare · CCN 380082
- Providence Portland Medical CenterPortland, OR · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 380061
- Providence St Vincent Medical CenterPortland, OR · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 380004
- Providence Willamette Falls Medical CenterOregon City, OR · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 380038
Practice locations
Addresses where Alexi P. Zemsky is enrolled with Medicare (CMS data updated October 2, 2026). The first 5 of 12; the Medicare profile lists all.
- 1003 N Providence Dr, Suite 325Newberg, OR 97132 (503) 216‑1661
- 1321 NE 99th Ave, Suite 200Portland, OR 97220 (503) 215‑4250
- 1510 Division StOregon City, OR 97045
- 200 S Hazel Dell WayCanby, OR 97013 (203) 263‑9500
- 440 NW Division StGresham, OR 97030 (503) 215‑9500
Group practices
Medicare enrollment lists Alexi P. Zemsky as a member of these groups (CMS data updated October 2, 2026).
- Providence Health and Services Oregon1,433 clinicians in the group
- Providence Health and Services - Oregon208 clinicians in the group
- Providence Health and Services - Oregon191 clinicians in the group
Specialties
Other cardiac electrophysiologists in Oregon
Clinicians with the same Medicare primary specialty in Oregon — not a recommendation.
Other clinicians in Providence Health and Services Oregon
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Tulane University School Of Medicine |
| Graduation year | 2002 (24 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1598944928 |
| 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