Dr. Siamak Heydarian, MD
- Medicare services, 2024
- 1,689
- Medicare patients, 2024
- 257
- Part D claims, 2024
- 5,986
- Hospital affiliations
- 3
- Industry payments
- $7,021
- Practice address
- 2200 Opitz Blvd, Woodbridge, VA 22191
- Practice phone
- Call (845) 426-6864
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Adult Primary Care Center
Woodbridge, Virginia
Find Dr. Heydarian's professional email, personal email and mobile number
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Dr. Siamak Heydarian is an internist in Woodbridge, Virginia
Dr. Heydarian practices at Adult Primary Care Center in Woodbridge, Virginia.
Dr. Heydarian's NPI, 1225072077, was assigned on June 15, 2006. Dr. Heydarian holds Virginia license 0101048248.
- NPI
- 1225072077NPI Registry (opens in a new tab)
- Medicare PAC ID
- 7416113659
- NPI enumeration date
- June 15, 2006
- NPI status
- Active
- Practice phone
- (845) 426-6864
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 65
- Medical school graduation
- 1987
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Practice Data
Dr. Siamak Heydarian practices at Adult Primary Care Center in Woodbridge, Virginia
Dr. Heydarian's primary practice is Adult Primary Care Center, at 2200 Opitz Blvd, Woodbridge, VA 22191 in Prince William County. The practice phone is (845) 426-6864.
- Adult Primary Care Center2200 Opitz Blvd, Woodbridge, VA 22191 · Prince William CountyPhone(845) 426-6864
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Siamak Heydarian is affiliated with 7 sites of care
Dr. Heydarian's primary practice is Adult Primary Care Center in Woodbridge, Virginia. Dr. Heydarian is also affiliated with Sentara Northern Virginia Medical Center. Dmand AI also links Dr. Heydarian to 2 more hospitals, 2 home health agencies and 1 physician office, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Siamak Heydarian's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Heydarian practices, 6 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Adult Primary Care Center | Available with a free account |
| +6 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Siamak Heydarian is one of 3,339 internists in Virginia
Internal medicine is Dr. Heydarian's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Heydarian is licensed in Virginia.
Specialties and state licenses
- Internal medicine, VirginiaPrimary
Internists near Dr. Heydarian
Counts of internists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Siamak Heydarian billed Medicare for 1,689 services in 2024
CMS data shows 1,689 Medicare services from Dr. Heydarian across 12 procedure codes in 2024, for 257 Medicare patients. Medicare paid $102,913 for them. Every service was in an office.
Dr. Heydarian's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 1,3972024: 1,26110%
- Other services
- 2023: 5002024: 41118%
- Tests and treatments
- 2023: 1002024: 1783%
Dr. Heydarian compared with the Virginia median for internists, 2024
- Dr. Heydarian
- Virginia median
- Medicare services
- 1,689vs 6072.8 times
- Medicare patients
- 257vs 246Close to median
- Part D claims
- 5,393vs 22424.1 times
Medians across 3,182 internists in Virginia with Dmand AI profiles that report each measure.
Dr. Heydarian's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Siamak Heydarian treated 257 Medicare patients in 2024, average age 76
CMS counts 257 Medicare patients who saw Dr. Heydarian in 2024. The largest group is 65 to 74, with 96 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 12% are also on Medicaid. Their average risk score is 1.14, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Heydarian's median patient age at 62, with 48% women.
Dr. Heydarian's Medicare patients by age, 2024
Dr. Heydarian's Medicare patients by sex, 2024
- Women14356%
- Men11444%
Chronic conditions among Dr. Heydarian's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Diabetes41%
- Chronic kidney disease37%
- Arthritis35%
- Ischemic heart disease32%
- Atrial fibrillation19%
- Cancer19%
Share of Medicare patients with each condition. A patient can have several.
Dr. Heydarian's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 62
Patient panel by sex, all payers
- Women48%
- Men50%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Siamak Heydarian wrote 5,986 Medicare Part D claims in 2024
In 2024, Dr. Heydarian wrote 5,986 Medicare Part D claims for 355 patients. 86% of them were for generic drugs. CMS names the drug for 5,393 of them, across 92 drugs with 11 or more claims each, at $571,780 in total drug cost. In 2023, CMS named 4,331 claims across 80 drugs.
Dr. Heydarian's Part D claims by kind of drug, 2024
- Generic5,175 claims86%
- Brand-name761 claims13%
- Other50 claims1%
Dr. Heydarian's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Heydarian's Part D claims, 2024
- Opioids0%18 of 5,986 claims
- Antibiotics2%135 of 5,986 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 4,3312024: 5,39325%
Drugs named by CMS: 92 in 2024, 80 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
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Dr. Siamak Heydarian received $7,021 in industry payments from 2016 to 2025
CMS Open Payments shows 316 general payments to Dr. Heydarian from 27 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 100% of the total. AstraZeneca Pharmaceuticals LP paid the most, $1,632.
General payments to Dr. Heydarian by program year, 2016 to 2025
General payments to Dr. Heydarian by kind, 2016 to 2025
- Food and beverage$6,992100%
- Education$290%
Companies that paid Dr. Heydarian the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Siamak Heydarian's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Siamak Heydarian
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Siamak Heydarian's NPI number?
Dr. Siamak Heydarian's NPI number is 1225072077. It was assigned on June 15, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Siamak Heydarian?
Dr. Siamak Heydarian is an internist in Woodbridge, Virginia. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Siamak Heydarian practice?
Dr. Heydarian practices at 2200 Opitz Blvd, Woodbridge, VA 22191. Dr. Heydarian's primary practice is Adult Primary Care Center in Woodbridge, Virginia. Dmand AI also links Dr. Heydarian to 2 hospitals, 2 home health agencies and 1 physician office.
What is Dr. Siamak Heydarian's office phone number?
The practice phone on file for Dr. Heydarian is (845) 426-6864.
What is Dr. Siamak Heydarian's medical license number?
Dr. Heydarian holds Virginia license 0101048248.
Which hospitals is Dr. Siamak Heydarian affiliated with?
Dr. Heydarian is affiliated with Sentara Northern Virginia Medical Center. Dmand AI links Dr. Heydarian to 2 more hospitals.
Does Dr. Siamak Heydarian accept Medicare?
Yes. CMS data shows Dr. Heydarian billed Medicare for 1,689 services in 2024.
How many Medicare patients does Dr. Siamak Heydarian see?
CMS counts 257 Medicare patients who saw Dr. Heydarian in 2024, with an average age of 76.
What services does Dr. Siamak Heydarian bill to Medicare?
In 2024, Dr. Heydarian's most billed Medicare services were office visit, established patient (99213), office visit, established patient (99214) and care management and other visits (99497).
What drugs does Dr. Siamak Heydarian prescribe most?
In 2024 Medicare Part D data, Dr. Heydarian's most prescribed drugs by claims were Atorvastatin Calcium, Amlodipine Besylate and Rosuvastatin Calcium.
Has Dr. Siamak Heydarian received payments from drug or device companies?
CMS Open Payments shows $7,021 in general payments to Dr. Heydarian from 27 companies from 2016 to 2025. The largest total came from AstraZeneca Pharmaceuticals LP.
How long has Dr. Siamak Heydarian been practicing?
Dr. Heydarian graduated from medical school in 1987, 39 years ago.
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