Alexi Zemsky, MD
NPI 1598944928 · Clinical Cardiac Electrophysiology Physician · Portland, OR
Enrolled with Medicare as Practitioner - Cardiac Electrophysiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Alexi Zemsky, MD is a Clinical Cardiac Electrophysiology Physician provider in Portland, OR (NPI 1598944928).
Provider details
- NPI number
- 1598944928
- Entity type
- Individual
- Primary specialty
- Clinical Cardiac Electrophysiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- MD126045 (OR)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
18 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
1,416 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Evaluation of Single, Dual, Multiple Lead Or Leadless Pacemaker System Or Implantable Defibrillator System, Remote Up to 90 Days93296 | 362 | $23 |
| Evaluation of Single, Dual, Or Multiple Lead Implantable Defibrillator System, Remote Up to 90 Days93295 | 225 | $36 |
| Evaluation of Single, Dual, Multiple Lead Or Leadless Pacemaker System, Remote Up to 90 Days93294 | 142 | $29 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 121 | $130 |
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Tracing93005 | 110 | $7 |
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report Only |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 19 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Apixabanbrand: Eliquis | 347 | 125 |
| Metoprolol Succinate | 290 | 107 |
| Flecainide Acetate | 247 | 94 |
| Sotalol Hclbrand: Sotalol | 238 | 82 |
| Amiodarone Hcl | 124 | 51 |
| Rivaroxabanbrand: Xarelto | 113 | 39 |
| Dofetilide | 109 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$6,472 across 34 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Additional practice locations (1)
- 1111 Ne 99th AveSuite 201Portland, OR 97220-9428Phone: (503) 962-1000Fax: (503) 962-1005
Registry dates
- Enumerated
- 2007-11-01
- Last updated
- 2023-06-20
- Certified
- 2023-06-20
Frequently asked questions
- What is Alexi Zemsky's NPI number?
- Alexi Zemsky's National Provider Identifier (NPI) is 1598944928, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Alexi Zemsky's specialty?
- Alexi Zemsky is listed in the NPPES registry with a primary specialty of Clinical Cardiac Electrophysiology Physician (Allopathic & Osteopathic Physicians).
- Where is Alexi Zemsky located?
- Alexi Zemsky's practice location on file with NPPES is 4400 Ne Halsey St Ste 102, Portland, OR 97213-1545.
- What is Alexi Zemsky's phone number?
- The practice phone number listed in the NPPES registry for Alexi Zemsky is (503) 962-1000.
- Does Alexi Zemsky accept Medicare?
- Alexi Zemsky is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Alexi Zemsky's NPI active?
- Yes — Alexi Zemsky's NPI (1598944928) is active in the NPPES registry as of the last update on 2023-06-20.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.