William S. Breall, M.D.
Cardiovascular Disease Physician · San Francisco, CA
William S. Breall, M.D. is a cardiovascular disease physician with a practice address in San Francisco, California, and NPI 1124042635, issued on Jul 27, 2006. Check the license (California A16635, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- William S. Breall
- Credential
- M.D.
- Primary taxonomy
- Cardiovascular Disease Physician 207RC0000X
- License number
- A16635 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2250 Hayes St, San Francisco, CA 94117
- Phone
- (415) 933-9100
- Enumerated
- Jul 27, 2006
- Record last updated
- Apr 25, 2008 (not updated in 18 years: call before relying on the address or phone)
- Fax
- (415) 933-9133
- Medicaid ID
- 00A166350 CA
- Medicare enrollment
- Enrolled (PECOS I20070322000530); accepts Medicare assignment
- Medical or professional school
- Oregon Health Sciences University School Of Medicine, 1954
- Entity
- Type 1 · individual
8 nearest cardiovascular disease physician records → All 2,574 in California → Look up another NPI →
Also registered at 2250 Hayes St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Pedro Aceves-Casillas, M.D.Internal Medicine Physician1144252396
- Kwok Chan, M.D.Internal Medicine Physician1063413714
- James Chun, M.D.Cardiovascular Disease Physician1134143506
- Joel Clark, DPMPodiatrist1093773681
- Peter Curran, MDCardiovascular Disease Physician1366422347
- Kenneth Fechtner, M.D.Physical Medicine & Rehabilitation Physician1396748893
Verify William S. Breall in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A16635Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
83% fewer Medicare Part D claims than the average cardiovascular disease physician in 2024
513 Medicare Part D claims for 44 beneficiaries, against an average of 3,078 among the 20,728 providers of this specialty who prescribed in Part D. Brand-name drugs were 9% of claims.
Most prescribed
- Atorvastatin Calcium54 claims
- Spironolactone-Hctz46 claims
- Metoprolol Succinate40 claims
- Carvedilol30 claims
- Finasteride26 claims
- Tamsulosin Hcl26 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): 94.3 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
- Cardiovascular Medical GroupSan Francisco, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
William S. Breall among 2,574 cardiovascular disease physician records in California
William S. Breall, M.D. is one of 2,574 cardiovascular disease 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 2006, is newer than 10% of them.
- NPI issued2006 · 10% of these records are older, 45% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 68% of these records are
- Graduated1954 · median 1999 among the 1,742 with a school on file
- Record last updated2008 · 63% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RC0000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Cardiovascular Disease Physician providers in California
There are 2,574 cardiovascular disease physician records in California.
All 2,574 in California → Every provider in San Francisco → Cardiovascular Disease Physician nationwide →
The 8 cardiovascular disease physician records with the nearest ZIP codes
- Sergio Bello, MDSan Francisco, CA 941171407868367
- James Chun, M.D.San Francisco, CA 941171134143506
- Peter Curran, MDSan Francisco, CA 941171366422347
- Gary Huang, M.D.San Francisco, CA 941171356633341
- Garrett Lee, MDSan Francisco, CA 941171760466981
- Albert Lee, M.D.San Francisco, CA 941171053335505
- Dana McGlothlin, M.D.San Francisco, CA 941171346285996
- Remo Morelli, MDSan Francisco, CA 941171932240595
Common questions
What is William S. Breall, M.D.'s NPI number?
William S. Breall, M.D.'s National Provider Identifier (NPI) is 1124042635, issued on Jul 27, 2006. An NPI identifies a provider in billing; it is not a license.
Where is William S. Breall, M.D. located?
The NPPES record lists a practice address at 2250 Hayes St, San Francisco, CA, 94117. Phone: (415) 933-9100. Providers update this record themselves, so call before visiting.
How can I verify William S. Breall, M.D.'s license?
NPPES lists California license number A16635, 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 S. Breall, M.D. prescribe under Medicare Part D?
In 2024, William S. Breall, M.D. had 513 Medicare Part D claims for 44 beneficiaries; the average among cardiovascular disease physician prescribers was 3,078. Part D covers Medicare prescriptions only.
What is William S. Breall, M.D.'s MIPS final score?
The 2023 MIPS final score is 94.3 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.