Siamak Heydarian, MD

Medicare activity in 2024

Official CMS public-use data for Siamak Heydarian, 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.

Most frequent services

1. Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)728 services
2. Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)231 services
3. Advance care planning, first 30 minutes (99497)180 services
4. Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit (G0439)173 services
5. Annual depression screening, 5 to 15 minutes (G0444)172 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%
• Diabetes41%
• Chronic kidney disease37%
• Arthritis35%
• Ischemic heart disease32%

Hospitals where Siamak Heydarian works

Medicare's Facility Affiliation Data lists Siamak Heydarian 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.

• Inova Mount Vernon HospitalAlexandria, VA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 490122
• Mary Washington HospitalFredericksburg, VA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 490022
• Sentara Northern Virginia Medical CenterWoodbridge, VA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 490113

Practice locations

Addresses where Siamak Heydarian is enrolled with Medicare (CMS data updated October 2, 2026).

• 2200 Opitz Blvd, Suite 350Woodbridge, VA 22191 (703) 497‑6700

Specialties

• Internal Medicineprimary

Find other Internal Medicine doctors in Virginia →

Other internal medicine doctors in Woodbridge

Clinicians with the same Medicare primary specialty in Woodbridge, VA — not a recommendation.

• Khadija I. Alvi, MD
• Khodiadad Basharmal, MD
• Anis Rehman, MD
• Tatek Teshome, MD
• Monsurul H. Khan, MD
• Bassam Farah, MD
• Meetal Mehta, MD
• Elena Short, MD

All internal medicine doctors in Woodbridge →

Clinician information

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. Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
2. Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
3. National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
4. Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
5. NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
6. Medicare Care Compare — official Medicare tool to look up clinicians