Catherine Koss, M.D.
Infectious Disease Physician · San Francisco, CA
Catherine Koss, M.D. is an infectious disease physician with a practice address in San Francisco, California, and NPI 1861727950, issued on Oct 8, 2009. Check the license (California A115493, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Catherine Koss
- Credential
- M.D.
- Primary taxonomy
- Infectious Disease Physician 207RI0200X
- License number
- A115493 CA
Self-reported in NPPES; status is on the state search - Practice location
- Ucsf Department OF Medicine, San Francisco, CA 94143
- Phone
- (415) 476-1528
- Enumerated
- Oct 8, 2009
- Record last updated
- May 13, 2026
- Entity
- Type 1 · individual
8 nearest infectious disease physician records → All 1,119 in California → Look up another NPI →
Also registered at Ucsf Department OF Medicine
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Mary JameStudent in an Organized Health Care Education/Training Program1801230149
- Claudia See, MD, MBAStudent in an Organized Health Care Education/Training Program1609627454
- Tho Tran, MDStudent in an Organized Health Care Education/Training Program1164273231
Verify Catherine Koss in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A115493Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
87% more Medicare Part D claims than the average infectious disease physician in 2024
1,290 Medicare Part D claims for 39 beneficiaries, against an average of 689 among the 7,388 providers of this specialty who prescribed in Part D. 83 claims were for opioids.
Most prescribed
- Atorvastatin Calcium86 claims
- Tivicay77 claims
- Descovy58 claims
- Metoprolol Succinate46 claims
- Gabapentin43 claims
- Ibuprofen43 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.
Catherine Koss among 1,119 infectious disease physician records in California
Catherine Koss, M.D. is one of 1,119 infectious disease 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 2009, is newer than 66% of them.
- NPI issued2009 · 66% of these records are older, 31% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 66% of these records are
- Record last updated2026 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RI0200X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Infectious Disease Physician providers in California
There are 1,119 infectious disease physician records in California.
All 1,119 in California → Every provider in San Francisco → Infectious Disease Physician nationwide →
The 8 infectious disease physician records with the nearest ZIP codes
- Cameron Ashbaugh, MDSan Francisco, CA 941431114900537
- Oliver Bacon, M.D.San Francisco, CA 941431497863146
- Huyen Cao, MDSan Francisco, CA 941431700842234
- Peter Chin-Hong, MDSan Francisco, CA 941431215988563
- John Fangman, MDSan Francisco, CA 941431881645737
- Timothy Henrich, M.D.San Francisco, CA 941431902831902
- Vivek Jain, M.D.San Francisco, CA 941431093747248
- Jane Koehler, MDSan Francisco, CA 941431689632747
Common questions
What is Catherine Koss, M.D.'s NPI number?
Catherine Koss, M.D.'s National Provider Identifier (NPI) is 1861727950, issued on Oct 8, 2009. An NPI identifies a provider in billing; it is not a license.
Where is Catherine Koss, M.D. located?
The NPPES record lists a practice address at Ucsf Department OF Medicine, San Francisco, CA, 94143. Phone: (415) 476-1528. Providers update this record themselves, so call before visiting.
How can I verify Catherine Koss, M.D.'s license?
NPPES lists California license number A115493, 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 Catherine Koss, M.D. prescribe under Medicare Part D?
In 2024, Catherine Koss, M.D. had 1,290 Medicare Part D claims for 39 beneficiaries; the average among infectious disease physician prescribers was 689. 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.