Medical emergency?Emergency? Call 911. Nearest emergency roomsNearest ERs

Emergency Medicine

Thomas G. Nessler Iii, MD

Sees patients in Frisco, TX · Texas

Summary

Dr. Thomas G. Nessler Iii, MD is an emergency medicine doctor at 9205 Legacy Dr, Frisco, TX 75033. Phone: (972) 625-6020. May accept Medicare assignment. In 2024, Thomas G. Nessler Iii had 25 Original Medicare patients and 665 services. NPI 1730408279. Source: CMS National Downloadable File, updated October 2, 2026; CMS Medicare Physician & Other Practitioners, data year 2024.

  • Specialty: Emergency medicine doctor (Medicare lists Emergency Medicine)
  • Address: 9205 Legacy Dr, Frisco, TX 75033 · Directions
  • Phone: (972) 625‑6020
  • Medicare: May accept Medicare assignment
  • Group practice: Legacy Urgent Care PA
  • Medical school: Medical University Of South Carolina College Of Medicine · graduated 2010 (16 years since medical school)
  • Gender (as listed): Male

From official Medicare data

This page shows what Medicare's official clinician data says about Thomas G. Nessler Iii, joined by NPI number (data updated October 2, 2026). It is not a recommendation or a rating. Call the office or hospital to confirm before you go.

In a medical emergency, call 911.

Quick answers

Does Thomas G. Nessler Iii accept Medicare assignment?
Medicare's clinician data says Thomas G. Nessler Iii may accept Medicare assignment (as of October 2, 2026). Ask the office whether they accept it for your visit.
How many Medicare patients does Thomas G. Nessler Iii see?
In 2024, CMS data shows 25 Original Medicare patients and 665 services for Thomas G. Nessler Iii. This counts Original Medicare only and measures volume, not quality.
What is Thomas G. Nessler Iii's NPI number?
1730408279. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.

Medicare activity in 2024

Official CMS public-use data for Thomas G. Nessler Iii, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.

Original Medicare patients25
Services billed to Medicare665
Different services or procedures45
Participating Medicare providerYes
Average age of these patients70

Chronic conditions among these patients

Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).

  • High cholesterol75%
  • High blood pressure68%
  • Arthritis56%
  • Anxiety48%

Practice locations

Addresses where Thomas G. Nessler Iii is enrolled with Medicare (CMS data updated October 2, 2026).

Group practices

Medicare enrollment lists Thomas G. Nessler Iii as a member of this group (CMS data updated October 2, 2026).

  • Legacy Urgent Care PA159 clinicians in the group

Specialties

Find other Emergency Medicine doctors in Texas →

Other emergency medicine doctors in Frisco

Clinicians with the same Medicare primary specialty in Frisco, TX — not a recommendation.

All emergency medicine doctors in Frisco →

Other clinicians in Legacy Urgent Care PA

Medicare enrollment lists these clinicians in the same group practice — not a recommendation.

Clinician information

CredentialMD
Medical schoolMedical University Of South Carolina College Of Medicine
Graduation year2010 (16 years since medical school)
Gender (as listed)Male
Medicare assignmentMay accept for some services
NPI (National Provider Identifier)1730408279
CorrectionsReport an error or suggest an update →

Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.

Sources

  1. National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
  2. Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
  3. NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
  4. Medicare Care Compare — official Medicare tool to look up clinicians