Dr. Siamak Mehdizadehseraj, MD
- Medicare services, 2024
- 3,033
- Medicare patients, 2024
- 450
- Part D claims, 2024
- 5,663
- Hospital affiliations
- 1
- Industry payments
- $56
- Practice address
- 377 E Chapman Ave, Placentia, CA 92870
- Practice phone
- Call (415) 563-0565
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
San Francisco Healthcare & Wellness Center
Placentia, California
Find Dr. Mehdizadehseraj's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Siamak Mehdizadehseraj is an internist in Placentia, California
Dr. Mehdizadehseraj practices at San Francisco Healthcare & Wellness Center in Placentia, California.
Dr. Mehdizadehseraj's NPI, 1720460942, was assigned on June 24, 2015. Dr. Mehdizadehseraj graduated from Tehran University of Medical Sciences School of Medicine in 2011. Dr. Mehdizadehseraj's California license number on file is A152630.
- NPI
- 1720460942NPI Registry (opens in a new tab)
- NPI enumeration date
- June 24, 2015
- NPI status
- Active
- Practice phone
- (415) 563-0565
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 43
- Medical school graduation
- 2011
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Practice Data
Dr. Siamak Mehdizadehseraj practices at San Francisco Healthcare & Wellness Center in Placentia, California
Dr. Mehdizadehseraj's primary practice is San Francisco Healthcare & Wellness Center, at 377 E Chapman Ave, Placentia, CA 92870 in Orange County. The practice phone is (415) 563-0565.
- San Francisco Healthcare & Wellness Center377 E Chapman Ave, Placentia, CA 92870 · Orange CountyPhone(415) 563-0565
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Siamak Mehdizadehseraj is affiliated with 3 sites of care and 5 medical groups
Dr. Mehdizadehseraj's primary practice is San Francisco Healthcare & Wellness Center in Placentia, California. Dr. Mehdizadehseraj is also affiliated with San Joaquin General Hospital. The medical group on file is Sound Physicians. Dmand AI also links Dr. Mehdizadehseraj to 4 more medical groups and 1 community health center, 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 Mehdizadehseraj's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Mehdizadehseraj practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| San Francisco Healthcare & Wellness Center | Available with a free account |
| +2 more sites and 4 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Siamak Mehdizadehseraj is one of 16,751 internists in California
Internal medicine is Dr. Mehdizadehseraj's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Mehdizadehseraj is board certified in internal medicine by the American Board of Internal Medicine. Dmand AI has Dr. Mehdizadehseraj's licenses on file in 2 states: California and Massachusetts.
Specialties and state licenses
- Internal medicine, CaliforniaPrimary
- Massachusetts license
Clinical focus
Dmand AI lists acute diabetes, alzheimer's disease, anemia, aneurysm, atrial fibrillation and flutter, cardiac arrhythmia, cellulitis and cerebrovascular disease among the conditions Dr. Mehdizadehseraj treats.
Internists near Dr. Mehdizadehseraj
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 Mehdizadehseraj billed Medicare for 3,033 services in 2024
CMS data shows 3,033 Medicare services from Dr. Mehdizadehseraj across 7 procedure codes in 2024, for 450 Medicare patients. Medicare paid $258,223 for them.
Dr. Mehdizadehseraj's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 1,4082024: 3,033115%
Where Dr. Mehdizadehseraj's Medicare services took place, 2024
- In an office2,24774%
- In a facility78626%
Dr. Mehdizadehseraj compared with the California median for internists, 2024
- Dr. Mehdizadehseraj
- California median
- Medicare services
- 3,033vs 3618.4 times
- Medicare patients
- 450vs 1513.0 times
- Part D claims
- 4,945vs 42111.7 times
Medians across 15,815 internists in California with Dmand AI profiles that report each measure.
Dr. Mehdizadehseraj'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 Mehdizadehseraj treated 450 Medicare patients in 2024, average age 81
CMS counts 450 Medicare patients who saw Dr. Mehdizadehseraj in 2024. The largest group is 85 and over, with 187 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 71% are also on Medicaid. Their average risk score is 2.75, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Mehdizadehseraj's median patient age at 81, with 52% women.
Dr. Mehdizadehseraj's Medicare patients by age, 2024
Dr. Mehdizadehseraj's Medicare patients by sex, 2024
- Women24755%
- Men20345%
Chronic conditions among Dr. Mehdizadehseraj's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Diabetes59%
- Alzheimer's and dementia56%
- Arthritis51%
- Mood disorders51%
- Chronic kidney disease49%
- Depression47%
Share of Medicare patients with each condition. A patient can have several.
Dr. Mehdizadehseraj's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 81
Patient panel by sex, all payers
- Women52%
- Men46%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Siamak Mehdizadehseraj wrote 5,663 Medicare Part D claims in 2024
In 2024, Dr. Mehdizadehseraj wrote 5,663 Medicare Part D claims for 382 patients. 83% of them were for generic drugs. CMS names the drug for 4,945 of them, across 100 drugs with 11 or more claims each, at $294,356 in total drug cost. In 2023, CMS named 787 claims across 29 drugs.
Dr. Mehdizadehseraj's Part D claims by kind of drug, 2024
- Generic4,725 claims83%
- Brand-name and other938 claims17%
Dr. Mehdizadehseraj'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. Mehdizadehseraj's Part D claims, 2024
- Opioids4%206 of 5,663 claims
- Antibiotics3%197 of 5,663 claims
- Antipsychotics, patients 65 and over2%111 of 5,663 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: 7872024: 4,945528%
Drugs named by CMS: 100 in 2024, 29 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 Mehdizadehseraj received $56 in industry payments from 2018 to 2023
CMS Open Payments shows 3 general payments to Dr. Mehdizadehseraj from 3 drug and device companies from 2018 to 2023. Food and beverage make up the largest share, 100% of the total. UCB, Inc. paid the most, $27.
General payments to Dr. Mehdizadehseraj by program year, 2018 to 2023
Companies that paid Dr. Mehdizadehseraj the most, 2018 to 2023
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Siamak Mehdizadehseraj graduated from Tehran University of Medical Sciences School of Medicine
Dr. Mehdizadehseraj graduated from Tehran University of Medical Sciences School of Medicine in 2011.
- Medical school
- Board certified in internal medicine
Source: Dmand AI Professional Profile Data
Dr. Siamak Mehdizadehseraj accepts plans from 14 insurance carriers
Dr. Mehdizadehseraj is in network with 14 carriers, including United Healthcare, Elevance and Aetna. PPO plans come from the most carriers, 8. Check the plan with the practice before a visit.
- United Healthcare
- Elevance
- Aetna
- Blue Cross Blue Shield of Massachusetts
- Blue Cross Blue Shield of Michigan
- HCSC
- Alliant Health Plans
- Aspirus Health Plan
- +6 more carriersWith a free account
Plan types Dr. Mehdizadehseraj accepts, by number of carriers
- PPO8
- HMO7
- EPO3
- Medicare3
- POS2
Source: Dmand AI Insurance Network Data
Sources for Dr. Siamak Mehdizadehseraj'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) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network Data |
| 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 Mehdizadehseraj
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 Mehdizadehseraj's NPI number?
Dr. Siamak Mehdizadehseraj's NPI number is 1720460942. It was assigned on June 24, 2015, and it is active in the NPI Registry.
What kind of doctor is Dr. Siamak Mehdizadehseraj?
Dr. Siamak Mehdizadehseraj is an internist in Placentia, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Siamak Mehdizadehseraj practice?
Dr. Mehdizadehseraj practices at 377 E Chapman Ave, Placentia, CA 92870. Dr. Mehdizadehseraj's primary practice is San Francisco Healthcare & Wellness Center in Placentia, California. Dmand AI also links Dr. Mehdizadehseraj to 4 medical groups and 1 community health center.
What is Dr. Siamak Mehdizadehseraj's office phone number?
The practice phone on file for Dr. Mehdizadehseraj is (415) 563-0565.
What is Dr. Siamak Mehdizadehseraj's medical license number?
Dr. Mehdizadehseraj's California license number on file is A152630, one of the licenses on file in 2 states.
Which states has Dr. Siamak Mehdizadehseraj been licensed in?
Dmand AI has state licenses on file for Dr. Mehdizadehseraj in California (2017 to 2025) and Massachusetts (2023 to 2026).
Which hospitals is Dr. Siamak Mehdizadehseraj affiliated with?
Dr. Mehdizadehseraj is affiliated with San Joaquin General Hospital.
What medical group is Dr. Siamak Mehdizadehseraj part of?
Dr. Mehdizadehseraj is linked to Sound Physicians. Dmand AI links Dr. Mehdizadehseraj to 4 more medical groups.
Does Dr. Siamak Mehdizadehseraj accept Medicare?
Yes. CMS data shows Dr. Mehdizadehseraj billed Medicare for 3,033 services in 2024.
How many Medicare patients does Dr. Siamak Mehdizadehseraj see?
CMS counts 450 Medicare patients who saw Dr. Mehdizadehseraj in 2024, with an average age of 81.
Show 7 more questionsShow fewer questions
Is Dr. Siamak Mehdizadehseraj board certified?
Yes. Dr. Mehdizadehseraj is board certified in internal medicine by the American Board of Internal Medicine.
What services does Dr. Siamak Mehdizadehseraj bill to Medicare?
In 2024, Dr. Mehdizadehseraj's most billed Medicare services were nursing facility care (99308), nursing facility care (99309) and hospital inpatient care (99232).
Where did Dr. Siamak Mehdizadehseraj go to medical school?
Dr. Mehdizadehseraj graduated from Tehran University of Medical Sciences School of Medicine in 2011.
What drugs does Dr. Siamak Mehdizadehseraj prescribe most?
In 2024 Medicare Part D data, Dr. Mehdizadehseraj's most prescribed drugs by claims were Atorvastatin Calcium, Amlodipine Besylate and Eliquis.
Has Dr. Siamak Mehdizadehseraj received payments from drug or device companies?
CMS Open Payments shows $56 in general payments to Dr. Mehdizadehseraj from 3 companies from 2018 to 2023. The largest total came from UCB, Inc.
How long has Dr. Siamak Mehdizadehseraj been practicing?
Dr. Mehdizadehseraj graduated from medical school in 2011, 15 years ago.
What insurance does Dr. Siamak Mehdizadehseraj accept?
Dr. Mehdizadehseraj is in network with 14 carriers, including United Healthcare, Elevance and Aetna. PPO plans come from the most carriers, 8. Check the plan with the practice before a visit.
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