Mark Kevin Horowitz, DO
Dermatology Physician · Torrance, CA
Mark Kevin Horowitz, DO is a dermatology physician with a practice address in Torrance, California, and NPI 1669413878, issued on Jun 9, 2006. Check the license (California 20A7642, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Mark Kevin Horowitz
- Credential
- DO
- Primary taxonomy
- Dermatology Physician 207N00000X
- License number
- 20A7642 CA
Self-reported in NPPES; status is on the state search - Practice location
- 23550 Hawthorne Blvd Ste 200, Torrance, CA 90505
- Phone
- (310) 373-2636
- Enumerated
- Jun 9, 2006
- Record last updated
- Jan 17, 2014 (not updated in 12 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest dermatology physician records → All 2,083 in California → Look up another NPI →
Also registered at 23550 Hawthorne Blvd Ste 200
A shared address usually means a shared clinic or building; it does not show who employs whom.
- David HorowitzDermatology Physician1285675538
- Michael Kassardjian, D.O.Dermatology Physician1740567981
- Divya Sachdev, MDDermatology Physician1316204936
Verify Mark Kevin Horowitz in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A7642Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
71% fewer Medicare Part D claims than the average dermatology physician in 2024
229 Medicare Part D claims for 100 beneficiaries, against an average of 797 among the 12,802 providers of this specialty who prescribed in Part D.
Most prescribed
- Triamcinolone Acetonide41 claims
- Ketoconazole40 claims
- Ciclopirox30 claims
- Valacyclovir15 claims
- Fluocinonide13 claims
- Fluorouracil13 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): 77.9 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).
Industry payments in 2024: $71.06
3 payments; by number, the most common kind was food and beverage; the largest payer was Janssen Biotech, Inc. The 10,250 providers of this specialty with any payment received $8,544.61 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.
Mark Kevin Horowitz among 2,083 dermatology physician records in California
Mark Kevin Horowitz, DO is one of 2,083 dermatology 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 6% of them.
- NPI issued2006 · 6% of these records are older, 56% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileNo · 70% of these records are
- Record last updated2014 · 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 207N00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Dermatology Physician providers in California
There are 2,083 dermatology physician records in California.
All 2,083 in California → Every provider in Torrance → Dermatology Physician nationwide →
The 8 dermatology physician records with the nearest ZIP codes
- Ronald Algra, MDTorrance, CA 905051669588695
- Melissa Camouse, D.O.Torrance, CA 905051689885279
- Noah Craft, M.D.Torrance, CA 905051750351193
- Susan Goodlerner, M.D.Torrance, CA 905051588710834
- David HorowitzTorrance, CA 905051285675538
- Julie Iwasaki, M.D.Torrance, CA 905051548416019
- Shirlene Jay, MDTorrance, CA 905051730158197
- Sree Karukonda, MDTorrance, CA 905051548318322
Common questions
What is Mark Kevin Horowitz, DO's NPI number?
Mark Kevin Horowitz, DO's National Provider Identifier (NPI) is 1669413878, issued on Jun 9, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mark Kevin Horowitz, DO located?
The NPPES record lists a practice address at 23550 Hawthorne Blvd Ste 200, Torrance, CA, 90505. Phone: (310) 373-2636. Providers update this record themselves, so call before visiting.
How can I verify Mark Kevin Horowitz, DO's license?
NPPES lists California license number 20A7642, 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 Mark Kevin Horowitz, DO prescribe under Medicare Part D?
In 2024, Mark Kevin Horowitz, DO had 229 Medicare Part D claims for 100 beneficiaries; the average among dermatology physician prescribers was 797. Part D covers Medicare prescriptions only.
What is Mark Kevin Horowitz, DO's MIPS final score?
The 2023 MIPS final score is 77.9 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.