Ma Somsouk, M.D.
Gastroenterology Physician · San Francisco, CA
Ma Somsouk, M.D. is a gastroenterology physician with a practice address in San Francisco, California, and NPI 1437296431, issued on Jan 31, 2007. Check the license (California A84310, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Ma Somsouk
- Credential
- M.D.
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- A84310 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1001 Potrero Ave # 3D-2, San Francisco, CA 94110
- Phone
- (415) 206-8823
- Enumerated
- Jan 31, 2007
- Record last updated
- Nov 6, 2014 (not updated in 12 years: call before relying on the address or phone)
- Fax
- (415) 641-0745
- Medicare enrollment
- Enrolled (PECOS I20070925000361); accepts Medicare assignment
- Medical or professional school
- Harvard Medical School, 2002
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 2,140 in California → Look up another NPI →
Verify Ma Somsouk in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A84310Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
95% fewer Medicare Part D claims than the average gastroenterology physician in 2024
42 Medicare Part D claims for 18 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 26% of claims.
Most prescribed
- Pantoprazole Sodium15 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 91.9 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- University OF California Sfgh Medical GroupSan Francisco, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Ma Somsouk among 2,140 gastroenterology physician records in California
Ma Somsouk, M.D. is one of 2,140 gastroenterology physician records with a practice address in California. 83% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 52% of them.
- NPI issued2007 · 52% of these records are older, 37% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 72% of these records are
- Graduated2002 · median 2002 among the 1,538 with a school on file
- Record last updated2014 · 60% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0100X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gastroenterology Physician providers in California
There are 2,140 gastroenterology physician records in California.
All 2,140 in California → Every provider in San Francisco → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- James Allison, MDSan Francisco, CA 941101265535777
- Patrick AvilaSan Francisco, CA 941101114365699
- Jeffrey Baumgardner, MDSan Francisco, CA 941101851533574
- Sun-Chuan Dai, MDSan Francisco, CA 941101811157050
- Colin FeuilleSan Francisco, CA 941101851718118
- Stanley Goldberg, MDSan Francisco, CA 941101366545865
- Mandana Khalili, MDSan Francisco, CA 941101184727687
- Jacquelyn Maher, MDSan Francisco, CA 941101457454951
Common questions
What is Ma Somsouk, M.D.'s NPI number?
Ma Somsouk, M.D.'s National Provider Identifier (NPI) is 1437296431, issued on Jan 31, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Ma Somsouk, M.D. located?
The NPPES record lists a practice address at 1001 Potrero Ave # 3D-2, San Francisco, CA, 94110. Phone: (415) 206-8823. Providers update this record themselves, so call before visiting.
How can I verify Ma Somsouk, M.D.'s license?
NPPES lists California license number A84310, 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 Ma Somsouk, M.D. prescribe under Medicare Part D?
In 2024, Ma Somsouk, M.D. had 42 Medicare Part D claims for 18 beneficiaries; the average among gastroenterology physician prescribers was 811. Part D covers Medicare prescriptions only.
What is Ma Somsouk, M.D.'s MIPS final score?
The 2023 MIPS final score is 91.9 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.