Quick answers
- Does Siamak Rassadi accept Medicare assignment?
- Yes. Medicare's clinician data says Siamak Rassadi 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 Siamak Rassadi see?
- In 2024, CMS data shows 457 Original Medicare patients and 4,400 services for Siamak Rassadi. This counts Original Medicare only and measures volume, not quality.
- What is Siamak Rassadi's NPI number?
- 1457500613. 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 Siamak Rassadi, 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 | 457 |
|---|---|
| Services billed to Medicare | 4,400 |
| Different services or procedures | 66 |
| Participating Medicare provider | Yes |
| Average age of these patients | 75 |
Most frequent services
- Subsequent nursing facility care with moderate level of medical decision making, per day, if using time, at least 30 minutes (99309)1,092 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)700 services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)274 services
- Evaluation of single, dual, multiple lead or leadless pacemaker system, remote up to 90 days (93294)266 services
- Injection, regadenoson, 0.1 mg (J2785)265 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%
- Arthritis47%
- Ischemic heart disease46%
- Atrial fibrillation46%
- Diabetes45%
Hospitals where Siamak Rassadi works
Medicare's Facility Affiliation Data lists Siamak Rassadi 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.
- Cobre Valley Regional Medical CenterGlobe, AZ · Critical Access Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 031314
- Honor Health John C. Lincoln Medical CenterPhoenix, AZ · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 030014
- St Josephs Hospital and Medical CenterPhoenix, AZ · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 030024
Practice locations
Addresses where Siamak Rassadi is enrolled with Medicare (CMS data updated October 2, 2026).
- 1514 W Thomas RdPhoenix, AZ 85015 (602) 283‑5732
- 285 N Broad StGlobe, AZ 85501 (602) 989‑0725
- 6502 N 35th AvePhoenix, AZ 85017 (602) 989‑0725
- 9200 N Central Ave, Suite 2Phoenix, AZ 85020 (480) 999‑4954
Group practices
Medicare enrollment lists Siamak Rassadi as a member of these groups (CMS data updated October 2, 2026).
- Unomed LLC12 clinicians in the group
- American Family Medicine LLC9 clinicians in the group
Specialties
Find other Cardiovascular Disease (Cardiology) doctors in Arizona →
Other cardiologists in Phoenix
Clinicians with the same Medicare primary specialty in Phoenix, AZ — not a recommendation.
Other clinicians in Unomed LLC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1998 (28 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1457500613 |
| 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