Siamak Stephen Marzban, M.D.
Internal Medicine Physician · San Pedro, CA
Siamak Stephen Marzban, M.D. is an internal medicine physician with a practice address in San Pedro, California, and NPI 1164447959, issued on Jul 13, 2006. Check the license (California A48221, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Siamak Stephen Marzban
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A48221 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2403 S Moray Ave, San Pedro, CA 90732
- Phone
- (310) 832-2694
- Enumerated
- Jul 13, 2006
- Record last updated
- Feb 20, 2017 (not updated in 9 years: call before relying on the address or phone)
- Fax
- (310) 547-0140
- Medicaid ID
- 00A482211 CA
- Medicare enrollment
- Enrolled (PECOS I20120222000770); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 2403 S Moray Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Yvette El SayadPsychologist1164009007
- Hanh Tran, D.D.S.Dentist1154596880
Verify Siamak Stephen Marzban in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A48221Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
33% fewer Medicare Part D claims than the average internal medicine physician in 2024
2,126 Medicare Part D claims for 109 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 8% of claims. 210 claims were for opioids.
Most prescribed
- Atorvastatin Calcium160 claims
- Hydrocodone-Acetaminophen144 claims
- Lisinopril119 claims
- Amlodipine Besylate89 claims
- Levothyroxine Sodium77 claims
- Ibuprofen74 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Siamak Stephen Marzban among 17,696 internal medicine physician records in California
Siamak Stephen Marzban, M.D. is one of 17,696 internal medicine physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 5% of them.
- NPI issued2006 · 5% of these records are older, 56% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated1979 · median 2004 among the 11,065 with a school on file
- Record last updated2017 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
14 internal medicine physician records list a practice address in San Pedro
They are 14 of the 1,072 NPPES records with a practice address in San Pedro, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in San Pedro → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Binh Dang, MDSan Pedro, CA 907321558651000
- Jasmeet Kaur, DOSan Pedro, CA 907321245813252
- Phyllis Monroe, M.D.San Pedro, CA 907321790704799
- Crescenzo Pisano, M.D.San Pedro, CA 907321144336769
- Roopa Reddy, M.D.San Pedro, CA 907321821007709
- Peter Sliskovich, M.D.San Pedro, CA 907321811970015
- Stephen Taus, MDSan Pedro, CA 907321508896259
- Nudrat Usman, M.D.San Pedro, CA 907321144517327
Common questions
What is Siamak Stephen Marzban, M.D.'s NPI number?
Siamak Stephen Marzban, M.D.'s National Provider Identifier (NPI) is 1164447959, issued on Jul 13, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Siamak Stephen Marzban, M.D. located?
The NPPES record lists a practice address at 2403 S Moray Ave, San Pedro, CA, 90732. Phone: (310) 832-2694. Providers update this record themselves, so call before visiting.
How can I verify Siamak Stephen Marzban, M.D.'s license?
NPPES lists California license number A48221, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Siamak Stephen Marzban, M.D. prescribe under Medicare Part D?
In 2024, Siamak Stephen Marzban, M.D. had 2,126 Medicare Part D claims for 109 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.