Siamak Heydarian, M.D.
NPI 1225072077 · Internal Medicine Physician · Woodbridge, VA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Siamak Heydarian, M.D. is a Internal Medicine Physician provider in Woodbridge, VA (NPI 1225072077).
Provider details
- NPI number
- 1225072077
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 0101048248 (VA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
1,689 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 728 | $83 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 231 | $116 |
| Advance Care Planning, First 30 Minutes99497 | 180 | $74 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 173 | $117 |
| Annual Depression Screening, 5 to 15 MinutesG0444 | 172 | $17 |
| Administration of Influenza Virus VaccineG0008 | 51 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 92 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 512 | 152 |
| Amlodipine Besylate | 461 | 135 |
| Rosuvastatin Calcium | 262 | 74 |
| Metoprolol Succinate | 192 | 56 |
| Levothyroxine Sodium | 186 | 51 |
| Hydralazine Hcl | 180 | 54 |
| Metformin Hcl |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$1,196 across 50 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-06-15
- Last updated
- 2008-01-16
Frequently asked questions
- What is Siamak Heydarian's NPI number?
- Siamak Heydarian's National Provider Identifier (NPI) is 1225072077, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Siamak Heydarian's specialty?
- Siamak Heydarian is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Siamak Heydarian located?
- Siamak Heydarian's practice location on file with NPPES is 2200 Opitz Blvd, Woodbridge, VA 22191-3321.
- What is Siamak Heydarian's phone number?
- The practice phone number listed in the NPPES registry for Siamak Heydarian is (703) 497-6700.
- Does Siamak Heydarian accept Medicare?
- Siamak Heydarian is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Siamak Heydarian's NPI active?
- Yes — Siamak Heydarian's NPI (1225072077) is active in the NPPES registry as of the last update on 2008-01-16.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.