ALEXI PAUL ZEMSKY MD
NPI 1598944928
Internal Medicine - Clinical Cardiac Electrophysiology in Portland, OR

Q: What is Alexi Zemsky's NPI number?

The NPI number for Alexi Zemsky is 1598944928. It was assigned to this individual provider in the NPPES registry on November 1, 2007.

Q: What is Alexi Zemsky's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Clinical Cardiac Electrophysiology, with taxonomy code 207RC0001X.

Q: When was this NPI record last updated?

The NPPES record for Alexi Zemsky was last updated on June 20, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since November 01, 2007PECOS EnrolledAccepts Medicare Assignment

4400 NE HALSEY ST STE 102, PORTLAND, OR 97213(503) 962-1000 Get Directions Write a Review

NPPES record last updated: June 20, 2023. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Jun 20, 2023, Mar 25, 2021, Feb 16, 2021 (3 updates tracked since 2021).

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About Alexi Paul Zemsky Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

ALEXI PAUL ZEMSKY MD (NPI 1598944928) is an individual clinical cardiac electrophysiology provider in Portland, Oregon, licensed in Oregon (MD126045) and active in the NPI registry since November 2007. He is enrolled in Medicare PECOS, is affiliated with Providence St Vincent Medical Center, and maintains a secondary practice location in Portland.

NPPES Registry Identity

NPI1598944928

Entity TypeIndividualMale

Primary Taxonomy207RC0001X

Provider Legal NameALEXI PAUL ZEMSKYCredential: MD

Location Address4400 NE HALSEY ST STE 102Portland, OR 97213-1545

Mailing AddressPo Box 3158Portland, OR 97208-3158 · (503) 215-6494

Phone(503) 962-1000

Sole ProprietorNo

Medical School CMSTulane University School Of MedicineGraduated 2002

Enumeration DateNovember 1, 2007

Last NPPES UpdateJune 20, 20233 updates tracked since enumeration

NPPES CertifiedJune 20, 2023

✔ NPI 1598944928 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal Medicine · Clinical Cardiac ElectrophysiologyAllopathic & Osteopathic Physicians

Taxonomy Code207RC0001X

License✔ Licensed in OR · MD126045

Definition

A field of special interest within the subspecialty of cardiovascular disease, specialty of Internal Medicine, which involves intricate technical procedures to evaluate heart rhythms and determine appropriate treatment for them.

Also ListedInternal Medicine · Cardiovascular DiseaseTaxonomy 207RC0000X · License MD126045 (OR)

4400 NE HALSEY ST STE 102, Portland, OR 97213

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Secondary Practice Location 1

Location 11111 NE 99th Ave, Suite 201Portland, OR 97220-9428 · Phone (503) 962-1000 · Fax (503) 962-1005

Other Identifiers 1

Medicaid500610656OR

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Providence Health Plan.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Alexi Paul Zemsky Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID3173677192

PECOS Enrollment IDI20090810000651

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

Medicare enrollment records show Alexi Zemsky reassigns Medicare billing to 7 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Providence Health & Services Oregon

Same address

Internal Medicine

4400 NE HALSEY ST
Portland, OR 97213

Reassigned Medicare billing, Oregon enrollment
1,501 clinicians in this Medicare group

NPI 1164623401 (503) 893-6524

Providence Health & Services - Oregon

0.5 mi

General Acute Care Hospital

4805 NE GLISAN ST
Portland, OR 97213

Reassigned Medicare billing, Oregon enrollment
676 clinicians in this Medicare group

NPI 1003991845 (503) 451-3000

Providence Health & Services Oregon

5.8 mi

General Acute Care Hospital

10150 SE 32ND AVE
Milwaukie, OR 97222

Reassigned Medicare billing, Oregon enrollment
229 clinicians in this Medicare group

NPI 1366536963 (503) 451-3000

Providence Health & Services - Oregon

7.6 mi

Clinic/Center

9205 SW BARNES RD, SUITE 20
Portland, OR 97225

Reassigned Medicare billing, Oregon enrollment
753 clinicians in this Medicare group

NPI 1235259532 (503) 216-2229

Providence Health & Services - Oregon

12 mi

Clinical Pathology

1500 DIVISION ST
Oregon City, OR 97045

Reassigned Medicare billing, Oregon enrollment
206 clinicians in this Medicare group

NPI 1003368911 (503) 656-1631

Providence Hood River Memorial Hospital

48 mi

Urgent Care

14040 HIGHWAY 35
Mt Hood, OR 97041

Reassigned Medicare billing, Oregon enrollment
Medicare enrollment name: Providence Health & Services Oregon
Also billed through NPI 1255429338 (Oregon)
267 clinicians in this Medicare group

NPI 1437355955 (503) 337-2292

Providence Health & Services - Oregon

221 mi

Clinic/Center

1111 CRATER LAKE AVE
Medford, OR 97504

Reassigned Medicare billing, Oregon enrollment
311 clinicians in this Medicare group

NPI 1093976243 (541) 732-5250

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 21

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Evaluation of single, dual, multiple lead or leadless pacemaker system or implantable defibrillator system, remote up to 90 days 93296

This procedure involves remotely monitoring your pacemaker or implantable defibrillator system. Over a 90-day period, we check the device's performance and your heart's activity. This helps ensure the device is functioning properly and providing the best possible support for your heart health.

362 services318 patients

Evaluation of single, dual, or multiple lead implantable defibrillator system, remote up to 90 days 93295

This procedure involves remotely monitoring your implantable defibrillator system, which can have single, dual, or multiple leads. Over a period of up to 90 days, the system's performance is evaluated to ensure it's working properly and providing the necessary heart rhythm support.

225 services189 patients

Evaluation of single, dual, multiple lead or leadless pacemaker system, remote up to 90 days 93294

This procedure evaluates your pacemaker system remotely for up to 90 days. It checks whether single, dual, multiple lead, or leadless pacemakers are working properly. It's a safe, convenient way to ensure your heart device is functioning optimally.

142 services132 patients

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214

This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.

121 services113 patients

Routine electrocardiogram (ecg) using at least 12 leads with tracing 93005

An Electrocardiogram (ECG) is a simple, painless test that records the heart's electrical activity. Using 12 leads attached to your skin, it generates a tracing of your heart rhythm. It helps detect any heart problems by showing the timing and strength of electrical signals passing through each part of your heart.

110 services105 patients

Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only 93010

A routine electrocardiogram (ECG) with 12 leads is a simple, non-invasive test that records the electrical activity of your heart. It helps in identifying heart conditions by detecting irregularities in your heart rhythms. The results are interpreted and a report is provided.

99 services87 patients

New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more 99205

This is a first-time patient visit where a healthcare professional spends 60-74 minutes with you. It involves a comprehensive evaluation, including your medical history and current health condition. They'll also advise on preventive health measures and formulate a treatment plan if needed.

65 services65 patients

Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report 93000

An electrocardiogram (ECG) is a non-invasive test that records your heart's electrical activity. Using 12 leads attached to your body, it captures data to help identify heart conditions. A doctor interprets the results and provides a report.

37 services36 patients

Programming of dual lead pacemaker system 93280

Programming of a dual lead pacemaker system is a procedure to adjust your heart's pacemaker settings. This process involves a small device, called a programmer, that communicates with your pacemaker to ensure it's working optimally for your heart's needs.

36 services31 patients

Insertion of pacemaker and upper and lower heart chamber electrode 33208

A pacemaker insertion is a procedure where a small device, called a pacemaker, is implanted under your skin. This device uses electrical pulses to prompt the heart to beat at a normal rate. Electrodes are placed in the upper and lower chambers of your heart to help regulate your heartbeat.

29 services29 patients

Programming of multiple lead implantable defibrillator system 93284

Programming of a multiple lead implantable defibrillator system involves adjusting settings on your implanted device to help control irregular heart rhythms. The process is non-invasive and helps ensure optimal device performance for maintaining heart health.

28 services23 patients

Comprehensive electrophysiologic evaluation with catheter destruction of abnormality causing atrial fibrillation (uncoordinated contraction of upper chambers of heart) by pulmonary vein isolation 93656

This is a procedure to treat atrial fibrillation, a condition causing irregular heartbeats. It involves a detailed heart evaluation using electrophysiology. A catheter is then used to destroy the problematic area causing the issue. Specifically, isolation of the pulmonary vein is done to regulate the heartbeat.

21 services21 patients

Comprehensive electrophysiologic evaluation with catheter destruction of abnormality of upper chamber of heart causing supraventricular tachycardia (rapid heart rate) 93653

This procedure is a detailed study of your heart's electrical activity. A thin tube (catheter) is inserted into your heart to identify and eliminate the area causing a fast heart rate. This helps restore normal heart rhythm, specifically targeting the upper chamber of the heart.

19 services19 patients

Programming of dual lead implantable defibrillator system 93283

Programming of a dual lead implantable defibrillator system involves adjusting settings on a device implanted in your chest. This device monitors your heart rhythm and delivers electrical pulses to correct irregular heartbeats, helping maintain a healthy heart rhythm.

18 services13 patients

Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more 99215

This service involves a follow-up appointment for existing patients, lasting between 40 to 54 minutes. During this time, your healthcare provider will assess your current health status, discuss any changes or concerns, review your treatment plan, and answer any questions you may have.

17 services16 patients

Heart rhythm recording of continous external ekg over 8-15 days 93246

A heart rhythm recording is a non-invasive procedure where a small device, attached externally, monitors your heart's electrical activity for 8-15 days. It helps detect irregular heart rhythms, assess heart rate, and guide treatment decisions. It's safe, painless, and can be done during normal daily activities.

16 services16 patients

Heart rhythm review and interpretation of continous external ekg over 8-15 days 93248

This service involves wearing a device for 8-15 days that continuously records your heart's electrical activity. It helps in identifying irregular heart rhythms. The recorded data is then reviewed and interpreted by a healthcare professional for any abnormalities.

16 services16 patients

Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only 93010

15 services15 patients

Evaluation of cardiac rhythm monitor system, remote up to 30 days 93298

This procedure involves remotely monitoring your heart rhythm for up to 30 days. A small device will record your heart's activity, which can be accessed by your healthcare team. This aids in diagnosing any irregularities or issues with your heart function.

14 services11 patients

Programming of heart rhythm stimulation after drug infusion 93623

Programming of heart rhythm stimulation after drug infusion is a process to regulate your heartbeat. After a medication is administered into your body, a device is programmed to monitor and correct irregular heart rhythms, ensuring your heart functions optimally.

14 services14 patients

Programming of single lead implantable defibrillator system 93282

Programming of a single lead implantable defibrillator system involves setting up and adjusting a device implanted in your body. This device helps regulate your heartbeat. It can detect irregular heart rhythms and provide corrective electric shocks to restore a normal heartbeat.

12 services11 patients

Hospital Affiliations CMS Care Compare 5

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Providence St Vincent Medical Center

Acute Care Hospitals · Portland, OR

4/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number380004

Location9205 SW Barnes RoadPortland, OR 97225 · Washington County

Emergency services Birthing friendly

Providence Willamette Falls Medical Center

Acute Care Hospitals · Oregon City, OR

4/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number380038

Location1500 Division StreetOregon City, OR 97045 · Clackamas County

Emergency services Birthing friendly

Providence Portland Medical Center

Acute Care Hospitals · Portland, OR

3/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number380061

Location4805 NE Glisan StreetPortland, OR 97213 · Multnomah County

Emergency services Birthing friendly

Providence Milwaukie Hospital

Acute Care Hospitals · Milwaukie, OR

4/5 CMS rating

OwnershipVoluntary non-profit - Church

CMS Certification Number380082

Location10150 SE 32nd AvenueMilwaukie, OR 97222 · Clackamas County

Providence Hood River Memorial Hospital

Critical Access Hospitals · Hood River, OR

4/5 CMS rating

OwnershipVoluntary non-profit - Church

CMS Certification Number381318

Location810 12th StreetHood River, OR 97031 · Hood River County

Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 97213 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$134.16 typical visit price

range $58.99 – $176.88

Typical copayment $33.54 (range $14.74 – $44.22)

Most-billed visit code 99204

Established Patient

$103.51 typical visit price

range $19.32 – $144.79

Typical copayment $25.87 (range $4.83 – $36.19)

Most-billed visit code 99214

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

CINDY M FULTON PA-C

Physician Assistant