Siri E. Loken, MD
Family Medicine Physician · San Francisco, CA
Siri E. Loken, MD is a family medicine physician with a practice address in San Francisco, California, and NPI 1578212692, issued on Mar 23, 2022. Check the license (California A202758, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Siri E. Loken
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- A202758 CA
Self-reported in NPPES; status is on the state search - Practice location
- 899 Valencia St, San Francisco, CA 94110
- Phone
- (415) 600-5400
- Enumerated
- Mar 23, 2022
- Record last updated
- Jan 16, 2026
- Medicare enrollment
- Enrolled (PECOS I20251117001419); accepts Medicare assignment
- Medical or professional school
- University Of California, Irvine, California College Of Medicine, 2022
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 17,133 in California → Look up another NPI →
Also registered at 899 Valencia St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Jonathan Lee, MDFamily Medicine Physician1174617963
- Katarina Velardez, NPAdult Health Nurse Practitioner1023845872
Verify Siri E. Loken in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A202758Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
90% fewer Medicare Part D claims than the average family medicine physician in 2024
343 Medicare Part D claims for 40 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D.
Most prescribed
- Atorvastatin Calcium25 claims
- Levothyroxine Sodium24 claims
- Gabapentin22 claims
- Meloxicam18 claims
- Omeprazole15 claims
- Rosuvastatin Calcium15 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.
Bills Medicare through one group practice
- Sutter Bay Medical FoundationSan Francisco, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Siri E. Loken among 17,133 family medicine physician records in California
Siri E. Loken, MD is one of 17,133 family medicine physician records with a practice address in California. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2022, is newer than 94% of them.
- NPI issued2022 · 94% of these records are older, 3% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated2022 · median 2005 among the 10,652 with a school on file
- Record last updated2026 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Family Medicine Physician providers in California
There are 17,133 family medicine physician records in California.
All 17,133 in California → Every provider in San Francisco → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Joaquin Barahona, M. D.San Francisco, CA 941101205895133
- Luis Bonilla, MDSan Francisco, CA 941101629019708
- Christopher Bositis, MDSan Francisco, CA 941101427054493
- Romilda Foresti-Lorente, MDSan Francisco, CA 941101164455374
- Steven Lawton, MDSan Francisco, CA 941101366486748
- Todd May, MDSan Francisco, CA 941101679528335
- Pooja Mittal, DOSan Francisco, CA 941101215916200
- David Nidorf, MDSan Francisco, CA 941101336186121
Common questions
What is Siri E. Loken, MD's NPI number?
Siri E. Loken, MD's National Provider Identifier (NPI) is 1578212692, issued on Mar 23, 2022. An NPI identifies a provider in billing; it is not a license.
Where is Siri E. Loken, MD located?
The NPPES record lists a practice address at 899 Valencia St, San Francisco, CA, 94110. Phone: (415) 600-5400. Providers update this record themselves, so call before visiting.
How can I verify Siri E. Loken, MD's license?
NPPES lists California license number A202758, 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 Siri E. Loken, MD prescribe under Medicare Part D?
In 2024, Siri E. Loken, MD had 343 Medicare Part D claims for 40 beneficiaries; the average among family medicine physician prescribers was 3,544. 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.