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

THOMAS MICHAEL LEONARD D.M.D.
NPI 1003817727
Dentist - General Practice in Arlington, MA

Q: What is Thomas Leonard's NPI number?

The NPI number for Thomas Leonard is 1003817727. It was assigned to this individual provider in the NPPES registry on August 3, 2005.

Q: What is Thomas Leonard's specialty?

The primary specialty registered for this NPI is Dentist, specializing in General Practice, with taxonomy code 1223G0001X.

Q: When was this NPI record last updated?

The NPPES record for Thomas Leonard 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 27 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.

Active since August 03, 2005PECOS Enrolled

366 MASS AVE, SUITE 301, ARLINGTON, MA 02474(781) 646-8609 Get Directions Write a Review

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

On this page

About Thomas Michael Leonard D.m.d. NPPES

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

THOMAS MICHAEL LEONARD D.M.D. (NPI 1003817727) is an individual general practice provider in Arlington, Massachusetts, licensed in Massachusetts (12586) and active in the NPI registry since August 2005. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1003817727

Entity TypeIndividualMale

Primary Taxonomy1223G0001X

Provider Legal NameTHOMAS MICHAEL LEONARDCredential: D.M.D.

Location Address366 MASS AVE, SUITE 301Arlington, MA 02474-6733

Mailing Address366 Mass Ave, Suite 301Arlington, MA 02474-6733 · (781) 646-8609

Phone(781) 646-8609

Sole ProprietorNo

Enumeration DateAugust 3, 2005

Last NPPES UpdateJuly 13, 2026

✔ NPI 1003817727 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyDentist · General PracticeDental Providers

Taxonomy Code1223G0001X

License✔ Licensed in MA · 12586

Definition

A general dentist is the primary dental care provider for patients of all ages. The general dentist is responsible for the diagnosis, treatment, management and overall coordination of services related to patients' oral health needs.

366 MASS AVE, Arlington, MA 02474

Open in Google Maps ↗

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Blue Cross and Blue Shield of Montana, Blue Cross and Blue Shield of Oklahoma, Blue Cross and Blue Shield of Texas.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)

Thomas Michael Leonard D.m.d. 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 02474 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

$97.64 typical visit price

range $63.72 – $189.86

Typical copayment $24.41 (range $15.93 – $47.46)

Most-billed visit code 99203

Established Patient

$78.84 typical visit price

range $21.07 – $155.29

Typical copayment $19.71 (range $5.26 – $38.82)

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

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

MS. ULRIKE DETTLING M.A., L.M.F.T.

Marriage & Family Therapist

366 MASS AVE, #304
ARLINGTON, MA 02474

Middlesex County (781) 648-9334

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 Thomas Leonard's NPI number?

The NPI number for Thomas Leonard is 1003817727. It was assigned to this individual provider in the NPPES registry on August 3, 2005.

Where is Thomas Leonard located?

Thomas Leonard practices at 366 Mass Ave Suite 301, Arlington, MA 02474. The listed phone number is (781) 646-8609.

What is Thomas Leonard's specialty?

The primary specialty registered for this NPI is Dentist, specializing in General Practice, with taxonomy code 1223G0001X.

Is Thomas Leonard enrolled in Medicare?

Yes. Thomas Leonard is registered in the Medicare PECOS enrollment system.

What insurance does Thomas Leonard accept?

Health plans from Blue Cross and Blue Shield of Montana, Blue Cross and Blue Shield of Oklahoma and Blue Cross and Blue Shield of Texas list Thomas Leonard 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 Thomas Leonard 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 27 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.