Siena Gabrielle Marcos Simmons, MD
Student in an Organized Health Care Education/Training Program · Los Angeles, CA
Siena Gabrielle Marcos Simmons, MD is a student in an organized health care education/training program with a practice address in Los Angeles, California, and NPI 1871297804, issued on Mar 27, 2023. Check the license with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Siena Gabrielle Marcos Simmons
- Credential
- MD
- Primary taxonomy
- Student in an Organized Health Care Education/Training Program 390200000X
- Practice location
- 1200 N State St., Los Angeles, CA 90033
- Phone
- (808) 366-8301
- Enumerated
- Mar 27, 2023
- Record last updated
- Mar 27, 2023
- Entity
- Type 1 · individual
8 nearest student in an organized health care education/training program records → All 40,652 in California → Look up another NPI →
Also registered at 1200 N State St.
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Kristi AgariDentist1255834560
- Zaira Chavez Jimenez, MDStudent in an Organized Health Care Education/Training Program1467155465
- Denaly ChenStudent in an Organized Health Care Education/Training Program1780188342
- Savanah GallegosStudent in an Organized Health Care Education/Training Program1326741869
- Alexander Gong, MDInternal Medicine Physician1346784865
- Alexis HaysStudent in an Organized Health Care Education/Training Program1831993856
Verify Siena Gabrielle Marcos Simmons in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this professionCheck the board
- 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
88% fewer Medicare Part D claims than the average student in an organized health care education/training program in 2024
23 Medicare Part D claims for 17 beneficiaries, against an average of 185 among the 59,748 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of 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.
Siena Gabrielle Marcos Simmons among 40,652 student in an organized health care education/training program records in California
Siena Gabrielle Marcos Simmons, MD is one of 40,652 student in an organized health care education/training program records with a practice address in California. 16% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2023, is newer than 42% of them.
- NPI issued2023 · 42% of these records are older, 47% newer
- In a Medicare fileYes · 16% of these records are
- In the CMS Doctors and Clinicians fileNo · 6% of these records are
- Record last updated2023 · 26% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 390200000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
6,770 student in an organized health care education/training program records list a practice address in Los Angeles
They are 6,770 of the 69,537 NPPES records with a practice address in Los Angeles, and 40,652 student in an organized health care education/training program records in California.
All 40,652 in California → Every provider in Los Angeles → Student in an Organized Health Care Education/Training Program nationwide →
The 8 student in an organized health care education/training program records with the nearest ZIP codes
- Wipapat Apichairuk, M.D.Los Angeles, CA 900331679739601
- Nicole EllisLos Angeles, CA 900331053555995
- Maria Gonzalez, LVNLos Angeles, CA 900331588836910
- John JimenezLos Angeles, CA 900331730313388
- Aarti Kaushik, MDLos Angeles, CA 900331740486323
- Martina Kennedy, D.O.Los Angeles, CA 900331417191073
- Seran Kim, MDLos Angeles, CA 900331083897573
- Megan Kordyak, M.D.Los Angeles, CA 900331235373200
Common questions
What is Siena Gabrielle Marcos Simmons, MD's NPI number?
Siena Gabrielle Marcos Simmons, MD's National Provider Identifier (NPI) is 1871297804, issued on Mar 27, 2023. An NPI identifies a provider in billing; it is not a license.
Where is Siena Gabrielle Marcos Simmons, MD located?
The NPPES record lists a practice address at 1200 N State St., Los Angeles, CA, 90033. Phone: (808) 366-8301. Providers update this record themselves, so call before visiting.
How can I verify Siena Gabrielle Marcos Simmons, MD's license?
Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Siena Gabrielle Marcos Simmons, MD prescribe under Medicare Part D?
In 2024, Siena Gabrielle Marcos Simmons, MD had 23 Medicare Part D claims for 17 beneficiaries; the average among student in an organized health care education/training program prescribers was 185. 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.