Kenneth Bruce Horwitz, M.D.
Internal Medicine Physician · Anaheim, CA
Kenneth Bruce Horwitz, M.D. is an internal medicine physician with a practice address in Anaheim, California, and NPI 1225138829, issued on Sep 24, 2006. Check the license (California G59007, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Kenneth Bruce Horwitz
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- G59007 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1211 W LA Palma Ave, Anaheim, CA 92801
- Phone
- (714) 772-8282
- Enumerated
- Sep 24, 2006
- Record last updated
- Mar 7, 2023
- Fax
- (714) 772-6493
- Medicaid ID
- 00G590070 CA
- Entity
- Type 1 · individual
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Verify Kenneth Bruce Horwitz in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G59007Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
49% more Medicare Part D claims than the average internal medicine physician in 2024
4,717 Medicare Part D claims for 304 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 24% of claims.
Most prescribed
- Atorvastatin Calcium333 claims
- Amlodipine Besylate295 claims
- Rosuvastatin Calcium271 claims
- Losartan Potassium215 claims
- Ozempic200 claims
- Metoprolol Succinate199 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.
Industry payments in 2024: $1,398.83
53 payments; by number, the most common kind was food and beverage; the largest payer was AstraZeneca Pharmaceuticals LP. The 50,334 providers of this specialty with any payment received $1,303.06 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Kenneth Bruce Horwitz among 17,696 internal medicine physician records in California
Kenneth Bruce Horwitz, M.D. is one of 17,696 internal medicine 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 2006, is newer than 5% of them.
- NPI issued2006 · 5% of these records are older, 56% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 63% of these records are
- Record last updated2023 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
189 internal medicine physician records list a practice address in Anaheim
They are 189 of the 9,018 NPPES records with a practice address in Anaheim, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Anaheim → Internal Medicine Physician nationwide →
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Common questions
What is Kenneth Bruce Horwitz, M.D.'s NPI number?
Kenneth Bruce Horwitz, M.D.'s National Provider Identifier (NPI) is 1225138829, issued on Sep 24, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Kenneth Bruce Horwitz, M.D. located?
The NPPES record lists a practice address at 1211 W LA Palma Ave, Anaheim, CA, 92801. Phone: (714) 772-8282. Providers update this record themselves, so call before visiting.
How can I verify Kenneth Bruce Horwitz, M.D.'s license?
NPPES lists California license number G59007, 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 Kenneth Bruce Horwitz, M.D. prescribe under Medicare Part D?
In 2024, Kenneth Bruce Horwitz, M.D. had 4,717 Medicare Part D claims for 304 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.