William F. Simmons, MD
Infectious Disease Physician · San Francisco, CA
William F. Simmons, MD is an infectious disease physician with a practice address in San Francisco, California, and NPI 1326537721, issued on May 2, 2018. Check the license (California A186895, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- William F. Simmons
- Credential
- MD
- Primary taxonomy
- Infectious Disease Physician 207RI0200X
- License number
- A186895 CA
Self-reported in NPPES; status is on the state search - Practice location
- 400 Parnassus Ave # 336, San Francisco, CA 94143
- Phone
- (415) 353-2626
- Enumerated
- May 2, 2018
- Record last updated
- Aug 7, 2023
- Fax
- (415) 353-3528
- Medicare enrollment
- Enrolled (PECOS I20230719003894); accepts Medicare assignment
- Medical or professional school
- Columbia University College Of Physicians And Surgeons, 2018
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest infectious disease physician records → All 1,119 in California → Look up another NPI →
Also registered at 400 Parnassus Ave # 336
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Katie HunterAcute Care Nurse Practitioner1619360203
Verify William F. Simmons in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A186895Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
65% fewer Medicare Part D claims than the average infectious disease physician in 2024
240 Medicare Part D claims for 64 beneficiaries, against an average of 689 among the 7,388 providers of this specialty who prescribed in Part D. Brand-name drugs were 9% of claims.
Most prescribed
- Doxycycline Hyclate21 claims
- Amoxicillin18 claims
- Sulfamethoxazole-Trimethoprim17 claims
- Fluconazole16 claims
- Minocycline Hcl13 claims
- Isoniazid12 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): 74.5 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 3 group practices
- Regents OF The University OF CaliforniaSan Francisco, CA
- Ucsf Medical Group Business ServicesBurlingame, CA
- University OF California San FranciscoSan Francisco, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
William F. Simmons among 1,119 infectious disease physician records in California
William F. Simmons, MD 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 2018, is newer than 90% of them.
- NPI issued2018 · 90% of these records are older, 8% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 66% of these records are
- Graduated2018 · median 2003 among the 735 with a school on file
- Record last updated2023 · 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 William F. Simmons, MD's NPI number?
William F. Simmons, MD's National Provider Identifier (NPI) is 1326537721, issued on May 2, 2018. An NPI identifies a provider in billing; it is not a license.
Where is William F. Simmons, MD located?
The NPPES record lists a practice address at 400 Parnassus Ave # 336, San Francisco, CA, 94143. Phone: (415) 353-2626. Providers update this record themselves, so call before visiting.
How can I verify William F. Simmons, MD's license?
NPPES lists California license number A186895, 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 William F. Simmons, MD prescribe under Medicare Part D?
In 2024, William F. Simmons, MD had 240 Medicare Part D claims for 64 beneficiaries; the average among infectious disease physician prescribers was 689. Part D covers Medicare prescriptions only.
What is William F. Simmons, MD's MIPS final score?
The 2023 MIPS final score is 74.5 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.