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Gwyneth Ellen Markowitz , PA

Physician Assistant β€’ Mentor, OH

Active NPI 1124904479 Individual Practitioner Female Practitioner Accepts Medicare assignment
Practice location in NPPES

9485 Mentor Ave
Mentor, OH 440604597

Call 4407016612 Location details and other listings
Medical Disclaimer

This profile restates public CMS/NPPES data; T-MedInfo gives no medical advice — consult a licensed professional, and call 911 for emergencies.

Practice Location & Contact Primary Location

Practice Address

9485 Mentor Ave

Mentor, OH 440604597

Telephone 4407016612
Organization at the Same NPPES Address or Phone
Mentor Surgery Center Ltd Facility NPI 1417958729

Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.

Other Listings in Public Data

CMS Doctors and Clinicians lists 1 group name: Lake Hospital System, Inc.. See the list

Source: CMS Doctors and Clinicians National Downloadable File, release date unavailable.

Listings do not confirm current availability, employment or a shared ownership network.

Medicare Profile & Education

Source: CMS Doctors and Clinicians National Downloadable File

Graduation Year

2025

Industry payments (Open Payments)

No Open Payments records are listed for this clinician for 2021–2025.

Guide: How to read an Open Payments record

Years since graduation

1 years (graduated 2025)

CMS Doctors and Clinicians data list 2025 as the year this clinician finished professional school.

What this does not show: Years since graduation

It is not the number of years in practice, and more years does not mean better care.

Source: CMS Doctors and Clinicians National Downloadable File.

NPI first issued

2025

The year this clinician's National Provider Identifier (NPI) was issued. An NPI is a unique 10-digit ID that US health care providers use for billing.

What this does not show: NPI first issued

NPIs have been issued only since 2005, so this year is not necessarily when the clinician started practicing.

Source: CMS NPPES NPI Registry.

Accepts Medicare assignment

CMS data list this clinician as accepting Medicare assignment. This means agreeing to take the Medicare-approved amount as full payment for covered services.

Medicare assignment applies to Original Medicare. It does not tell you whether the clinician is in a Medicare Advantage plan's network, accepts other insurance, or is taking new patients.

Source: CMS Doctors and Clinicians; Medicare.gov, β€œDoes your provider accept Medicare as full payment?”

Guide: What Medicare assignment means

No telehealth indicator

CMS shows this indicator only when recent Medicare claims include telehealth services. The clinician may still offer telehealth; ask the office.

Source: CMS, Telehealth Indicator on Medicare Care Compare (fact sheet, January 2023); CMS Doctors and Clinicians.

Guide: How Medicare covers telehealth

Enrolled in Medicare (PECOS)

Gwyneth Markowitz has a Medicare enrollment record in PECOS, the CMS system clinicians use to enroll so they can bill Medicare or order services for people with Medicare.

It does not show whether the clinician accepts assignment, is in your plan's network, or is taking new patients.

Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.

Guide: What Medicare enrollment (PECOS) means

Can order Medicare-covered services

CMS lists Gwyneth Markowitz as eligible to order or refer Medicare Part B clinical laboratory and imaging services, durable medical equipment (DME) and home health services for people with Medicare.

What this does not show: Can order Medicare-covered services

It does not mean the clinician offers these services directly.

Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.

Guide: What ordering and referring status means

Compared with the same specialty in Mentor and Ohio

18 active clinicians are listed under Physician Assistant with a practice address in Mentor, OH (5,329 in Ohio).

Addresses are self-reported to NPPES and may be out of date.

Telehealth indicator in Mentor

11.1% of these 18 clinicians have the CMS telehealth indicator.

66.7% of these 18 clinicians are listed by CMS as accepting Medicare assignment.

Sources: CMS Doctors and Clinicians, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.

Text: T-MedInfo Β· Report an error.

Specialties & License Numbers Reported to NPPES

Self-certified to NPPES: 2025-08-13
Physician Assistant Primary Specialty

NUCC Taxonomy Code: 363A00000X

A physician assistant is a person who has successfully completed an accredited education program for physician assistant, is licensed by the state and is practicing within the scope of that license. Physician assistants are formally trained to perform many of the routine, time-consuming tasks a physician can do. In some states, they may prescribe medications. They take medical histories, perform physical exams, order lab tests and x-rays, and give inoculations. Most states require that they work under the supervision of a physician.

Check License Status with the State Board License numbers are self-reported to NPPES; T-MedInfo does not confirm them against state records. Current status: State Medical Board of Ohio.
Look Up on State Board Site

Medicare (PECOS) Enrollment & Ordering Eligibility

Source: CMS PECOS
Medicare FFS Enrollment Status Medicare Enrollment on File
CMS Provider Specialty

PRACTITIONER - PHYSICIAN ASSISTANT

Medicare Enrollment ID

I20251007002560

Enrollment State Jurisdiction

OH

PECOS Control ID

7517464522

Medicare Order & Referring Eligibility
Clinical Lab & Imaging (Part B) Eligible
Durable Medical Equipment (DME) Eligible
Home Health Agency (HHA) Eligible
Power Mobility Devices (PMD) Eligible

Sources: CMS Provider Enrollment and Order and Referring. Medicare enrollment is a billing status, not an accreditation or quality rating.

Medicare Group Practice Enrollments

Source: CMS Doctors and Clinicians National Downloadable File

Lake Hospital System, Inc.

36500 Euclid Ave, Willoughby, OH 440944455

Phone: 4405160530

Lake Hospital System, Inc.

9485 Mentor Ave, Mentor, OH 440608723

Clinicians Sharing This Practice Address or Phone

Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.

12 listed
Dr. John Baniewicz , MD

Internal Medicine

NPI 1285740530

Doctor of Medicine (M.D.)

Dr. Stephen Baum , MD

Internal Medicine

NPI 1396847307

Doctor of Medicine (M.D.)

Dr. Patrick Boylan , MD

Physical Medicine & Rehabilitation - Pain Medicine

NPI 1386669810

Doctor of Medicine (M.D.)

Dr. Jacqueline Cerar , DDS

Dentist - General Practice

NPI 1144283227

Doctor of Dental Surgery

Kerry Chemnitz , AA

Anesthesiologist Assistant

NPI 1699031294
Dr. Nicholas Detore , MD

Internal Medicine

NPI 1942438197

Doctor of Medicine (M.D.)

Career & Practice History

NPI enumerated August 13, 2025.

No changes to the name, practice address, taxonomy or NPI status in this record have been observed in the monthly NPPES data files from September 2025 to August 2026.

No reviews have been published yet. Leave a review.

NPI Administrative Meta

NPI Number: 1124904479
Entity Type:
Individual Provider Physician, Nurse Practitioner, or Solo Healthcare Professional (Type 1 NPI)
Enumeration Date: August 13, 2025
Last Update: August 13, 2025
Sole Proprietor: No

Other Physician Assistants in Mentor

All Physician Assistants in Mentor

Mailing Address

135 Mill Run

Aurora, OH 442026707

Phone: 4406657129

About This Data NPPES fields (address, phone, specialty, license) are self-reported and may be outdated; Medicare fields follow the CMS dataset named in each section. Correct directly at NPPES.