William Mullen, MD
Cardiovascular Disease Physician · Santa Clara, CA
William Mullen, MD is a cardiovascular disease physician with a practice address in Santa Clara, California, and NPI 1457362329, issued on Aug 10, 2006. Check the license (California A43317, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- William Mullen
- Credential
- MD
- Primary taxonomy
- Cardiovascular Disease Physician 207RC0000X
- License number
- A43317 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2441 Mission College Blvd, Santa Clara, CA 95054
- Phone
- (800) 478-8837
- Enumerated
- Aug 10, 2006
- Record last updated
- Oct 22, 2025
- Medicaid ID
- 145965100 WY
- Medicare enrollment
- Enrolled (PECOS I20040413000870); accepts Medicare assignment
- Medical or professional school
- Tulane University School Of Medicine, 1984
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest cardiovascular disease physician records → All 2,574 in California → Look up another NPI →
Also registered at 2441 Mission College Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Yvonne Lee, MDPediatrics Physician1972183507
Verify William Mullen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A43317Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
32% fewer Medicare Part D claims than the average cardiovascular disease physician in 2024
2,103 Medicare Part D claims for 368 beneficiaries, against an average of 3,078 among the 20,728 providers of this specialty who prescribed in Part D. Brand-name drugs were 28% of claims.
Most prescribed
- Metoprolol Succinate248 claims
- Atorvastatin Calcium209 claims
- Eliquis198 claims
- Losartan Potassium144 claims
- Rosuvastatin Calcium129 claims
- Repatha Sureclick106 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): 100 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
- Sutter Bay Medical FoundationSanta Clara, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
William Mullen among 2,574 cardiovascular disease physician records in California
William Mullen, MD 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
- Graduated1984 · median 1999 among the 1,742 with a school on file
- Record last updated2025 · 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 Santa Clara → Cardiovascular Disease Physician nationwide →
The 8 cardiovascular disease physician records with the nearest ZIP codes
- Sirtaz Adatya, M.D.Santa Clara, CA 950511861683559
- Farnaz Azarbal, M.D.Santa Clara, CA 950511316236078
- Kent Feng, MDSanta Clara, CA 950511073976478
- Jesse Fitzpatrick, M.D.Santa Clara, CA 950511871987784
- Viswanatha Lanka, M.D.Santa Clara, CA 950511558629675
- Philip Lee, MDSanta Clara, CA 950511578649406
- Da Ouyang, MDSanta Clara, CA 950511235549460
- Hemal Parekh, MDSanta Clara, CA 950511427137553
Common questions
What is William Mullen, MD's NPI number?
William Mullen, MD's National Provider Identifier (NPI) is 1457362329, issued on Aug 10, 2006. An NPI identifies a provider in billing; it is not a license.
Where is William Mullen, MD located?
The NPPES record lists a practice address at 2441 Mission College Blvd, Santa Clara, CA, 95054. Phone: (800) 478-8837. Providers update this record themselves, so call before visiting.
How can I verify William Mullen, MD's license?
NPPES lists California license number A43317, 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 Mullen, MD prescribe under Medicare Part D?
In 2024, William Mullen, MD had 2,103 Medicare Part D claims for 368 beneficiaries; the average among cardiovascular disease physician prescribers was 3,078. Part D covers Medicare prescriptions only.
What is William Mullen, MD's MIPS final score?
The 2023 MIPS final score is 100 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.