Dr. Siamak Stephen Marzban, MD
- Medicare services, 2024
- 500
- Medicare patients, 2024
- 57
- Part D claims, 2024
- 2,126
- Hospital affiliations
- 2
- Industry payments
- $186
- Practice address
- 2403 S Moray Ave, San Pedro, CA 90732-4342
- Practice phone
- Call (310) 832-2694
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Siamak Marzban, MD
Physician office · San Pedro, California
Find Dr. Marzban'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 Stephen Marzban is an internist in San Pedro, California
Dr. Marzban practices at Siamak Marzban, MD in San Pedro, California.
Dr. Marzban's NPI, 1164447959, was assigned on July 13, 2006. Dr. Marzban holds California license A48221.
- NPI
- 1164447959NPI Registry (opens in a new tab)
- Medicare PAC ID
- 1153589171
- NPI enumeration date
- July 13, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (310) 832-2694
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 73
- Medical school graduation
- 1979
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Siamak Stephen Marzban practices at Siamak Marzban, MD in San Pedro, California
Dr. Marzban's primary practice is Siamak Marzban, MD, at 2403 S Moray Ave, San Pedro, CA 90732-4342. The practice phone is (310) 832-2694.
- Siamak Marzban, MD2403 S Moray Ave, San Pedro, CA 90732-4342Phone(310) 832-2694
Source: Dmand AI Affiliation Data
Dr. Siamak Stephen Marzban is affiliated with 5 sites of care
Dr. Marzban's primary practice is Siamak Marzban, MD in San Pedro, California. Dr. Marzban is also affiliated with Providence Little Company of Mary Medical Center San Pedro. Dmand AI also links Dr. Marzban to 1 more hospital and 2 home health agencies, each named with a free account.
Source: Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Siamak Stephen Marzban's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Marzban practices, 5 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Siamak Marzban, MD | Available with a free account |
| +4 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Siamak Stephen Marzban is one of 16,751 internists in California
Internal medicine is Dr. Marzban's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Marzban is licensed in California.
Specialties and state licenses
- Internal medicine, CaliforniaPrimary
Internists near Dr. Marzban
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 Stephen Marzban billed Medicare for 500 services in 2024
CMS data shows 500 Medicare services from Dr. Marzban across 4 procedure codes in 2024, for 57 Medicare patients. Medicare paid $50,536 for them. Every service was in an office.
Dr. Marzban's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 4222024: 47914%
- Surgery
- 2023: 142024: 2150%
- Other services
- 2023: 112024: 0100%
Dr. Marzban compared with the California median for internists, 2024
- Dr. Marzban
- California median
- Medicare services
- 500vs 36139% above
- Medicare patients
- 57vs 15162% below
- Part D claims
- 1,742vs 4214.1 times
Medians across 15,815 internists in California with Dmand AI profiles that report each measure.
Dr. Marzban'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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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Marzban and other internists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Siamak Stephen Marzban treated 57 Medicare patients in 2024, average age 70
CMS counts 57 Medicare patients who saw Dr. Marzban in 2024. The largest group is 65 to 74, with 39 patients. 72% of them have high cholesterol, and 70% have high blood pressure. 75% are also on Medicaid. Their average risk score is 1.12, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Marzban's median patient age at 57, with 51% women.
Dr. Marzban's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Marzban's Medicare patients by sex, 2024
- Women2951%
- Men2849%
Chronic conditions among Dr. Marzban's Medicare patients, 2024
- High cholesterol72%
- High blood pressure70%
- Arthritis54%
- Anxiety42%
- COPD40%
- Depression35%
- Mood disorders35%
- Atrial fibrillation33%
Share of Medicare patients with each condition. A patient can have several.
Dr. Marzban's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 57
Patient panel by sex, all payers
- Women51%
- Men49%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Siamak Stephen Marzban wrote 2,126 Medicare Part D claims in 2024
In 2024, Dr. Marzban wrote 2,126 Medicare Part D claims for 109 patients. 91% of them were for generic drugs. CMS names the drug for 1,742 of them, across 48 drugs with 11 or more claims each, at $59,640 in total drug cost. In 2023, CMS named 1,629 claims across 48 drugs.
Dr. Marzban's Part D claims by kind of drug, 2024
- Generic1,936 claims91%
- Brand-name175 claims8%
- Other15 claims1%
Dr. Marzban'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. Marzban's Part D claims, 2024
- Opioids10%210 of 2,126 claims
- Antibiotics8%165 of 2,126 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: 1,6292024: 1,7427%
Drugs named by CMS: 48 in 2024, 48 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
How Dr. Siamak Stephen Marzban takes part in Medicare
Dr. Marzban accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Siamak Stephen Marzban received $186 in industry payments from 2016 to 2020
CMS Open Payments shows 10 general payments to Dr. Marzban from 7 drug and device companies from 2016 to 2020. Food and beverage make up the largest share, 100% of the total. Pfizer Inc. paid the most, $62.
General payments to Dr. Marzban by program year, 2016 to 2020
Companies that paid Dr. Marzban the most, 2016 to 2020
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Siamak Stephen Marzban'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 | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation 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) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (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 Stephen Marzban
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 Stephen Marzban's NPI number?
Dr. Siamak Stephen Marzban's NPI number is 1164447959. It was assigned on July 13, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Siamak Stephen Marzban?
Dr. Siamak Stephen Marzban is an internist in San Pedro, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Siamak Stephen Marzban practice?
Dr. Marzban practices at 2403 S Moray Ave, San Pedro, CA 90732-4342. Dr. Marzban's primary practice is Siamak Marzban, MD in San Pedro, California. Dmand AI also links Dr. Marzban to 1 hospital and 2 home health agencies.
What is Dr. Siamak Stephen Marzban's office phone number?
The practice phone on file for Dr. Marzban is (310) 832-2694.
What is Dr. Siamak Stephen Marzban's medical license number?
Dr. Marzban holds California license A48221.
Which hospitals is Dr. Siamak Stephen Marzban affiliated with?
Dr. Marzban is affiliated with Providence Little Company of Mary Medical Center San Pedro. Dmand AI links Dr. Marzban to 1 more hospital.
Does Dr. Siamak Stephen Marzban accept Medicare?
Yes. CMS data shows Dr. Marzban billed Medicare for 500 services in 2024, and Dr. Marzban accepts Medicare assignment.
How many Medicare patients does Dr. Siamak Stephen Marzban see?
CMS counts 57 Medicare patients who saw Dr. Marzban in 2024, with an average age of 70.
What services does Dr. Siamak Stephen Marzban bill to Medicare?
In 2024, Dr. Marzban's most billed Medicare services were office visit, established patient (99214), office visit, established patient (99213) and office visit, established patient (99215).
What drugs does Dr. Siamak Stephen Marzban prescribe most?
In 2024 Medicare Part D data, Dr. Marzban's most prescribed drugs by claims were Atorvastatin Calcium, Hydrocodone-Acetaminophen and Lisinopril.
Has Dr. Siamak Stephen Marzban received payments from drug or device companies?
CMS Open Payments shows $186 in general payments to Dr. Marzban from 7 companies from 2016 to 2020. The largest total came from Pfizer Inc.
How long has Dr. Siamak Stephen Marzban been practicing?
Dr. Marzban graduated from medical school in 1979, 47 years ago.
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