Quick answers
- Does Stephen J. Portz accept Medicare assignment?
- Yes. Medicare's clinician data says Stephen J. Portz 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 Stephen J. Portz see?
- In 2024, CMS data shows 589 Original Medicare patients and 1,733 services for Stephen J. Portz. This counts Original Medicare only and measures volume, not quality.
- What is Stephen J. Portz's NPI number?
- 1811933500. 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 Stephen J. Portz, 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 | 589 |
|---|---|
| Services billed to Medicare | 1,733 |
| Different services or procedures | 17 |
| Participating Medicare provider | Yes |
| Average age of these patients | 77 |
Most frequent services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)773 services
- Routine electrocardiogram (ecg) using at least 12 leads with tracing (93005)201 services
- Injection, regadenoson, 0.1 mg (J2785)156 services
- Ultrasound of heart with color-depicted blood flow, rate, direction and valve function (93306)128 services
- Technetium tc-99m sestamibi, diagnostic, per study dose (A9500)126 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%
- Ischemic heart disease53%
- Arthritis47%
- Diabetes35%
- Chronic kidney disease28%
Practice locations
Addresses where Stephen J. Portz is enrolled with Medicare (CMS data updated October 2, 2026).
- 3131 La Canada St, Suite 200Las Vegas, NV 89169 (702) 369‑5582
Group practices
Medicare enrollment lists Stephen J. Portz as a member of this group (CMS data updated October 2, 2026).
- Intermountain Medical Holdings Nevada Inc313 clinicians in the group
Specialties
Find other Cardiovascular Disease (Cardiology) doctors in Nevada →
Other cardiologists in Las Vegas
Clinicians with the same Medicare primary specialty in Las Vegas, NV — not a recommendation.
Other clinicians in Intermountain Medical Holdings Nevada Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Kansas School Of Med (kc/wich/sal) |
| Graduation year | 1982 (44 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1811933500 |
| 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
- 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