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Deactivated NPI 1669453544 Deactivated / Inactive NPI Female Practitioner

Dr. Helene Markus , DMD

Dentist • Kennett Square, PA

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Notice of NPI Deactivation & Inactive Practice Status

According to official public domain records published by CMS (Centers for Medicare & Medicaid Services) in the National Provider Identifier (NPPES) Registry, Dr. Helene Markus has officially deactivated this NPI record and ceased active healthcare practice.

Registration / Start Date November 08, 2005
NPI Deactivation Date May 21, 2026
Total Practice Duration ~21 Years of Practice (2005 – 2026)

Professional Overview & Biography Verified Profile Summary

Dr. Helene Markus, DMD was a registered Dentist practicing in Kennett Square, PA. Throughout an active medical career spanning 21 years, Dr. Markus provided care at the practice location at 1107 E BALTIMORE PIKE until profile deactivation on 2026-05-21.

Practice Location & Contact Primary Location

Practice Address

1107 E Baltimore Pike

Kennett Square, PA 193482366

Telephone 6103885500
Fax 4842590200
Associated Practice Facility / Clinic
🏢 Kendal-Crosslands Communities Facility NPI 1518948405

Specialty Benchmarks & Practice Insights

Comparative analytics for Dentist in Kennett Square, PA

Active Practitioner
Practitioner Clinical Experience
Active
City Avg: 10.5 Yrs
State Avg: 18.0 Yrs
Regional Practice Density
9 Specialists

Practicing in Kennett Square, PA (3554 Statewide)

Telehealth Adoption Rate
0.0% Regional Adoption

In-Person Office Visits Only

Medicare Pricing Discount
67.4% Avg Savings

Under CMS Medicare Fee Schedule vs Standard Submitted Charges

Medical Specialties & State Licenses

Dentist Primary Specialty

NUCC Taxonomy Code: 122300000X

State License PA DS024700L

A dentist is a person qualified by a doctorate in dental surgery (D.D.S.) or dental medicine (D.M.D.), licensed by the state to practice dentistry, and practicing within the scope of that license. There is no difference between the two degrees: dentists who have a DMD or DDS have the same education. Universities have the prerogative to determine what degree is awarded. Both degrees use the same curriculum requirements set by the American Dental Association's Commission on Dental Accreditation. Generally, three or more years of undergraduate education plus four years of dental school is required to graduate and become a general dentist. State licensing boards accept either degree as equivalent, and both degrees allow licensed individuals to practice the same scope of general dentistry. Additional post-graduate training is required to become a dental specialist.

Practice Associates & Co-Workers

Healthcare professionals and specialists practicing at this location or sharing practice phone/fax

1 Associated Practitioners
James Herlihey , MPT

Physical Therapist - Geriatrics

NPI 1003031774

Master of Physical Therapy

Career & Practice History Timeline

Chronological log of verified NPI updates, location relocations, credentials, and registry changes

7 Historical Events
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NPI Profile Deactivated May 21, 2026

Record deactivated on May 21, 2026

NPI Profile Active July 08, 2007

NPI status registered as active in NPPES database

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Updated Practice Location July 08, 2007

Registered at 1107 E BALTIMORE PIKE, KENNETT SQUARE, PA 193482366 (Tel: 6103885500)

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Updated Business Mailing Address July 08, 2007

Registered at 1517 THORNBERRY RD, WYNCOTE, PA 190952310 (Tel: 2158874536)

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Provider Name / Credentials Updated July 08, 2007

Recorded as HELENE MARKUS, DMD

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Medical Taxonomy / Specialty Registered (Primary Specialty) July 08, 2007

Dentist (License #DS024700L in PA)

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Initial NPI Registration & Enumeration November 08, 2005

First registered as active Individual Practitioner in NPPES Database.

Patient & Community Reviews

Verified patient ratings, medical care experiences, and facility photos

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NPI Administrative Meta

NPI Number: 1669453544
Entity Type:
Individual Provider Physician, Nurse Practitioner, or Solo Healthcare Professional (Type 1 NPI)
Enumeration Date: November 08, 2005
Last Update: July 08, 2007
Deactivation Date: May 21, 2026

Mailing Address

1517 Thornberry Rd

Wyncote, PA 190952310

Phone: 2158874536

Public Domain Record This profile contains public domain information published by CMS and NPPES under the Freedom of Information Act (FOIA).
⚠️ Medical Disclaimer

This directory listing is for informational purposes only and does not constitute medical advice, diagnosis, or physician endorsement. If you are experiencing a medical emergency, please call 911 immediately.