Michael Sidney Horowitz, MD
Cardiovascular Disease Physician · Tiburon, CA
Michael Sidney Horowitz, MD is a cardiovascular disease physician with a practice address in Tiburon, California, and NPI 1275647174, issued on Aug 18, 2006. Check the license (California G22771, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Michael Sidney Horowitz
- Credential
- MD
- Primary taxonomy
- Cardiovascular Disease Physician 207RC0000X
- License number
- G22771 CA
Self-reported in NPPES; status is on the state search - Practice location
- 253 Trinidad Dr, Tiburon, CA 94920
- Phone
- (201) 563-2205
- Enumerated
- Aug 18, 2006
- Record last updated
- Oct 14, 2024
- Fax
- (973) 364-0101
- Entity
- Type 1 · individual
8 nearest cardiovascular disease physician records → All 2,574 in California → Look up another NPI →
Verify Michael Sidney Horowitz in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G22771Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
99% fewer Medicare Part D claims than the average cardiovascular disease physician in 2024
41 Medicare Part D claims, against an average of 3,078 among the 20,728 providers of this specialty who prescribed in Part D.
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.
Michael Sidney Horowitz among 2,574 cardiovascular disease physician records in California
Michael Sidney Horowitz, 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 fileNo · 68% of these records are
- Record last updated2024 · 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).
2 cardiovascular disease physician records list a practice address in Tiburon
They are 2 of the 69 NPPES records with a practice address in Tiburon, and 2,574 cardiovascular disease physician records in California.
All 2,574 in California → Every provider in Tiburon → Cardiovascular Disease Physician nationwide →
The 8 cardiovascular disease physician records with the nearest ZIP codes
- Shaun Coughlin, M.D., PH.D.Tiburon, CA 949201568667749
- Scott Adelman, MDSan Rafael, CA 949031396829362
- Alan Ament, MDSan Rafael, CA 949031871671354
- Bjoern Laurberg, MDSan Rafael, CA 949031487738464
- David Sulciner, MDSan Rafael, CA 949031053461939
- Andrew TaiSan Rafael, CA 949031902365760
- Rami Turk, MDSan Rafael, CA 949031619155900
- James Adams, M.D.Larkspur, CA 949391578553277
Common questions
What is Michael Sidney Horowitz, MD's NPI number?
Michael Sidney Horowitz, MD's National Provider Identifier (NPI) is 1275647174, issued on Aug 18, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Michael Sidney Horowitz, MD located?
The NPPES record lists a practice address at 253 Trinidad Dr, Tiburon, CA, 94920. Phone: (201) 563-2205. Providers update this record themselves, so call before visiting.
How can I verify Michael Sidney Horowitz, MD's license?
NPPES lists California license number G22771, 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 Michael Sidney Horowitz, MD prescribe under Medicare Part D?
In 2024, Michael Sidney Horowitz, MD had 41 Medicare Part D claims; the average among cardiovascular disease physician prescribers was 3,078. 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.