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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

DR. MARSHALL LAWRENCE HORWITZ D.D.S.
NPI 1750374468
Dentist in Worcester, MA

Active since August 27, 2005PECOS Enrolled
111 ELM ST, SUITE 101, WORCESTER, MA 01609(508) 799-4626(508) 791-4288 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: August 02, 2026.

About Dr. Marshall Lawrence Horwitz D.d.s. NPPES

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

DR. MARSHALL LAWRENCE HORWITZ D.D.S. (NPI 1750374468) is an individual dentist in Worcester, Massachusetts, licensed in Massachusetts (13920) and active in the NPI registry since August 2005. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1750374468
Entity TypeIndividualMale
Primary Taxonomy122300000X
Provider Legal NameDR. MARSHALL LAWRENCE HORWITZCredential: D.D.S.
Location Address111 ELM ST, SUITE 101Worcester, MA 01609-1967
Mailing Address111 Elm St, Suite 101Worcester, MA 01609-1967 · (508) 799-4626 · Fax (508) 791-4288
Phone(508) 799-4626
Fax(508) 791-4288
Sole ProprietorNo
Enumeration DateAugust 27, 2005
Last NPPES UpdateJuly 13, 2026
✔ NPI 1750374468 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyDentistDental Providers
Taxonomy Code122300000X
License✔ Licensed in MA · 13920
Definition
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.
111 ELM ST, Worcester, MA 01609
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Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Anthem Blue Cross and Blue Sheld, Blue Cross and Blue Shield of Montana, Blue Cross and Blue Shield of Oklahoma and more.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Marshall Lawrence Horwitz D.d.s. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

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.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 01609 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
$90.70 typical visit price
range $58.86 – $177.36
Typical copayment $22.67 (range $14.71 – $44.34)
Most-billed visit code 99203
Established Patient
$73.22 typical visit price
range $19.11 – $144.84
Typical copayment $18.30 (range $4.77 – $36.21)
Most-billed visit code 99213
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 15

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

DR. TATIANA ANNA HAMAWI M.D.
Pediatrics
111 ELM ST, SUITE 201
WORCESTER, MA 01609
Worcester County (508) 753-7700
ELM PARK PHYSICAL THERAPY LLC
Physical Therapist
111 ELM ST, SUITE 103
WORCESTER, MA 01609
Worcester County (508) 799-6538
ELLIOT W SALLOWAY DMD INC
Dentist (Periodontics)
111 ELM ST, STE 203
WORCESTER, MA 01609
Worcester County (508) 752-1302
MS. TARA MICHELLE TIVNAN LMHC
Counselor (Mental Health)
111 ELM ST, SUITE 102
WORCESTER, MA 01609
Worcester County (508) 756-3750
ROBERT SADOWSKI PT
Physical Therapist
111 ELM ST, SUITE 103
WORCESTER, MA 01609
Worcester County (508) 799-6538
MS. SUSAN B. HORWITZ M.A.,CCC
Speech-Language Pathologist
111 ELM ST, SUITE 101
WORCESTER, MA 01609
Worcester County (508) 799-6278
COMMON PARK DENTAL
Dentist
111 ELM ST, SUITE 203
WORCESTER, MA 01609
Worcester County (508) 502-7881
RON HSIN
Dentist
111 ELM ST, SUITE 203
WORCESTER, MA 01609
Worcester County (508) 926-8633

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Marshall Horwitz's NPI number?

The NPI number for Marshall Horwitz is 1750374468. It was assigned to this individual provider in the NPPES registry on August 27, 2005.

Where is Marshall Horwitz located?

Marshall Horwitz practices at 111 Elm St Suite 101, Worcester, MA 01609. The listed phone number is (508) 799-4626.

What is Marshall Horwitz's specialty?

The primary specialty registered for this NPI is Dentist with taxonomy code 122300000X.

Is Marshall Horwitz enrolled in Medicare?

Yes. Marshall Horwitz is registered in the Medicare PECOS enrollment system.

What insurance does Marshall Horwitz accept?

Health plans from Anthem Blue Cross and Blue Sheld, Blue Cross and Blue Shield of Montana, Blue Cross and Blue Shield of Oklahoma and Blue Cross and Blue Shield of Texas list Marshall Horwitz as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

When was this NPI record last updated?

The NPPES record for Marshall Horwitz was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 25 days 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.