Quick answers
- Does Zachary R. Williams accept Medicare assignment?
- Yes. Medicare's clinician data says Zachary R. Williams accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Zachary R. Williams see?
- In 2024, CMS data shows 2,737 Original Medicare patients and 5,584 services for Zachary R. Williams. This counts Original Medicare only and measures volume, not quality.
- What is Zachary R. Williams's NPI number?
- 1134372584. 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 Zachary R. Williams, 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 patients | 2,737 |
|---|---|
| Services billed to Medicare | 5,584 |
| Different services or procedures | 47 |
| Participating Medicare provider | Yes |
| Average age of these patients | 77 |
Most frequent services
- Ultrasound of heart with color-depicted blood flow, rate, direction and valve function (93306)1,086 services
- Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only (93010)727 services
- Evaluation of single, dual, multiple lead or leadless pacemaker system, remote up to 90 days (93294)555 services
- Evaluation of single, dual, multiple lead or leadless pacemaker system or implantable defibrillator system, remote up to 90 days (93296)424 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)419 services
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 blood pressure75%
- High cholesterol75%
- Arthritis52%
- Ischemic heart disease52%
- Atrial fibrillation41%
- Chronic kidney disease34%
Hospitals where Zachary R. Williams works
Medicare's Facility Affiliation Data lists Zachary R. Williams at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Intermountain Health Cedar City HospitalCedar City, UT · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 460007
- Intermountain Health Garfield Memorial HospitalPanguitch, UT · Critical Access Hospital · Emergency services: listed by Medicare · CCN 461333
- Memorial HospitalBelleville, IL · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 140185
- St. George Regional HospitalSt George, UT · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 460021
Practice locations
Addresses where Zachary R. Williams is enrolled with Medicare (CMS data updated October 2, 2026). The first 5 of 6; the Medicare profile lists all.
- 1301 Bertha Howe Ave, Suite 6Mesquite, NV 89027 (435) 251‑2500
- 1380 E Medical Ctr Dr, Suite 1500St George, UT 84790 (435) 251‑2500
- 200 N 400, Garfield Memorial Hospital Physicians GroupPanguitch, UT 84759 (435) 676‑8842
- 2650 N Tenaya Way, Suite 201Las Vegas, NV 89128 (702) 736‑7154
- 4600 Memorial Dr, Suite W1Belleville, IL 62226 (618) 233‑3066
Group practices
Medicare enrollment lists Zachary R. Williams as a member of these groups (CMS data updated October 2, 2026).
- Ihc Health Services Inc3,960 clinicians in the group
- Fairview Heights Medical Group SC444 clinicians in the group
- Yavapai Regional Medical Center Physician Care LLC124 clinicians in the group
- Garfield County11 clinicians in the group
Specialties
Find other Cardiovascular Disease (Cardiology) doctors in Nevada →
Other cardiologists in Mesquite
Clinicians with the same Medicare primary specialty in Mesquite, NV — not a recommendation.
Other clinicians in Ihc Health Services Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Utah School Of Medicine |
| Graduation year | 2007 (19 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1134372584 |
| Corrections | Report 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
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians