Thomas Lee Horowitz, D.O.
Family Medicine Physician · Los Angeles, CA
Thomas Lee Horowitz, D.O. is a family medicine physician with a practice address in Los Angeles, California, and NPI 1538113444, issued on May 22, 2006. Check the license (California 20A4870, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Thomas Lee Horowitz
- Credential
- D.O.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 20A4870 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1300 N Vermont Ave, Los Angeles, CA 90027
- Phone
- (323) 666-5550
- Enumerated
- May 22, 2006
- Record last updated
- Jul 12, 2026
- Fax
- (323) 666-5552
- Medicaid ID
- 00AX48700 CA
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 17,133 in California → Look up another NPI →
Also registered at 1300 N Vermont Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Silverio Arano, MDFamily Medicine Physician1447229851
Verify Thomas Lee Horowitz in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A4870Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
93% fewer Medicare Part D claims than the average family medicine physician in 2024
251 Medicare Part D claims for 54 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D.
Most prescribed
- Amlodipine Besylate21 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.
Thomas Lee Horowitz among 17,133 family medicine physician records in California
Thomas Lee Horowitz, D.O. is one of 17,133 family medicine physician records with a practice address in California. 81% 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 6% of them.
- NPI issued2006 · 6% of these records are older, 59% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileNo · 62% of these records are
- Record last updated2026 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
829 family medicine physician records list a practice address in Los Angeles
They are 829 of the 69,537 NPPES records with a practice address in Los Angeles, and 17,133 family medicine physician records in California.
All 17,133 in California → Every provider in Los Angeles → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Silverio Arano, MDLos Angeles, CA 900271447229851
- Michael Burton, MDLos Angeles, CA 900271477513547
- Letitia Ho, MDLos Angeles, CA 900271922179837
- Scott Howell, DOLos Angeles, CA 900271831182591
- Tony Hwang, MDLos Angeles, CA 900271093886053
- Joanne Mogannam, MDLos Angeles, CA 900271124199005
- Anthony Morena, MDLos Angeles, CA 900271487725461
- Mercedes Narez, MDLos Angeles, CA 900271285705160
Common questions
What is Thomas Lee Horowitz, D.O.'s NPI number?
Thomas Lee Horowitz, D.O.'s National Provider Identifier (NPI) is 1538113444, issued on May 22, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Thomas Lee Horowitz, D.O. located?
The NPPES record lists a practice address at 1300 N Vermont Ave, Los Angeles, CA, 90027. Phone: (323) 666-5550. Providers update this record themselves, so call before visiting.
How can I verify Thomas Lee Horowitz, D.O.'s license?
NPPES lists California license number 20A4870, 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 Thomas Lee Horowitz, D.O. prescribe under Medicare Part D?
In 2024, Thomas Lee Horowitz, D.O. had 251 Medicare Part D claims for 54 beneficiaries; the average among family medicine physician prescribers was 3,544. 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.