Dr. Mark Kevin Horowitz , DO
Dermatology • Torrance, CA
23550 Hawthorne Blvd Ste 200
Torrance, CA 905054722
This profile restates public CMS/NPPES data; T-MedInfo gives no medical advice — consult a licensed professional, and call 911 for emergencies.
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NPI assigned on June 9, 2006; this date does not establish years in practice.
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Published CMS data list 634 Original Medicare Part B services in 2024.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024. Published rows only; this is not a quality measure.
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Published Part B service records, 2024:
- 17003 — Destruction of precancer skin growth, 2-14 growths: 293 service units.
- 99213 — Established patient outpatient office visit: 200 service units.
- 17000 — Destruction of precancer skin growth, 1 growth: 93 service units.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024. Units differ by code; these are not visits or a measure of quality.
CPT® only copyright 2023 American Medical Association. All rights reserved. Service names are shortened from CPT Consumer Friendly Descriptors (CMS data, 2024). CPT notice
See all 5 records in the table · Guide: How to read Medicare Part B data
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Published CMS data list 152 Medicare Part D prescriptions, including refills, in 2024.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024. Published rows only; this is not a quality measure.
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Published Part D records, 2024:
- Triamcinolone Acetonide — 41 prescription fills, including refills.
- Ketoconazole — 40 prescription fills, including refills.
- Ciclopirox — 30 prescription fills, including refills.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024. Drug names come from pharmacy claims. Listing a drug here is not an endorsement or a recommendation.
See all 6 records in the table · Guide: How to read Medicare Part D prescriber data
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Fewer Medicare Part B services than 80% of clinicians listed under Dermatology in Torrance, CA (2024, 24 clinicians with data). Median for this group: 1,859. Middle half: 950 to 4,148.
Fewer Medicare Part B services than 80% of clinicians listed under Dermatology in California (2024, 1,168 clinicians with data). Median for this group: 2,239. Middle half: 927 to 4,781.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024. Billing and prescribing volume is not a quality rating.
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Medicare Part B services went from 7,010 in 2020 to 634 in 2024.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2020–2024.
Practice Location & Contact Primary Location
23550 Hawthorne Blvd Ste 200
Torrance, CA 905054722
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
What Public CMS Data Show
Dermatology: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare patients
220 people with Original Medicare in 2024
It gives a sense of how many people with Medicare this clinician treated that year.
Source: CMS, Medicare Physician & Other Practitioners – by Provider, 2024.
Medicare-allowed amount
About $33,564 in 2024
The total amount Medicare approved for these services in 2024. It includes what Medicare paid and what patients or their other insurance owed, such as the deductible and coinsurance.
It shows the total cost of this clinician's Original Medicare services under Medicare's fee rules.
What this does not show: Medicare-allowed amount
This is not the clinician's income. Part of it can go to a clinic or group practice, staff, equipment or drugs. It is not the price you will pay.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024.
Paid by Medicare
About $19,254 in 2024
The part of the Medicare-allowed amount that Medicare itself paid in 2024, after patients' deductibles and coinsurance.
The gap between the allowed amount and this number is roughly what patients and their other insurance paid.
What this does not show: Paid by Medicare
This is not the clinician's income and not a measure of quality.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024.
30-day fills
163 standardized 30-day fills in 2024
CMS converts prescriptions to 30-day supplies so they can be compared. A 90-day prescription counts as about three 30-day fills.
What this does not show: 30-day fills
It is not a count of patients and not a measure of quality.
Part D drug cost
$3,309 in 2024
The total cost of these prescriptions in 2024, paid by Medicare drug plans, patients and other payers together.
It shows the total spending on drugs this clinician prescribed, not what any one patient paid.
What this does not show: Part D drug cost
A higher cost often reflects the type of medicines a specialty uses. It is not your out-of-pocket cost and not a measure of quality.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024.
Industry payments (Open Payments)
Fewer than 11 payment records totaling $13.12 in 2025
Drug and medical device companies must report certain payments to doctors and some other clinicians to CMS, such as meals, travel, speaking fees or research funding.
It shows reported financial ties between this clinician and companies. You can ask your clinician about them.
These records are submitted by drug and medical device companies, and a reported payment does not necessarily mean the financial relationship is improper.
General: payments not tied to research, such as meals, travel, consulting or speaking fees.
A reported payment does not necessarily mean the financial relationship is improper. Research payments can go to a hospital or university for a study the clinician leads, not to the clinician personally. Clinicians can dispute records with the company that reported them.
Source: CMS Open Payments, program year 2025.
NPI first issued
2006
The year this clinician's National Provider Identifier (NPI) was issued. An NPI is a unique 10-digit ID that US health care providers use for billing.
What this does not show: NPI first issued
NPIs have been issued only since 2005, so this year is not necessarily when the clinician started practicing.
Source: CMS NPPES NPI Registry.
Medicare assignment not listed
CMS data do not show whether this clinician accepts Medicare assignment. This does not mean they do not accept Medicare. Ask the office.
Medicare assignment applies to Original Medicare. It does not tell you whether the clinician is in a Medicare Advantage plan's network, accepts other insurance, or is taking new patients.
Source: CMS Doctors and Clinicians; Medicare.gov, “Does your provider accept Medicare as full payment?”
No telehealth indicator
CMS shows this indicator only when recent Medicare claims include telehealth services. The clinician may still offer telehealth; ask the office.
Source: CMS, Telehealth Indicator on Medicare Care Compare (fact sheet, January 2023); CMS Doctors and Clinicians.
Enrolled in Medicare (PECOS)
Dr. Horowitz has a Medicare enrollment record in PECOS, the CMS system clinicians use to enroll so they can bill Medicare or order services for people with Medicare.
It does not show whether the clinician accepts assignment, is in your plan's network, or is taking new patients.
Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.
Can order Medicare-covered services
CMS lists Dr. Horowitz as eligible to order or refer Medicare Part B clinical laboratory and imaging services, durable medical equipment (DME) and home health services for people with Medicare.
Medicare pays for these items and services only when they are ordered by an eligible clinician.
What this does not show: Can order Medicare-covered services
It does not mean the clinician offers these services directly.
Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.
Compared with the same specialty in Torrance and California
Billing and prescribing volume is not a quality rating.
Medicare Part B services
Fewer Medicare Part B services than 80% of clinicians listed under Dermatology in Torrance, CA (2024, 24 clinicians with data). Median for this group: 1,859. Middle half: 950 to 4,148.
Fewer Medicare Part B services than 80% of clinicians listed under Dermatology in California (2024, 1,168 clinicians with data). Median for this group: 2,239. Middle half: 927 to 4,781.
Medicare-allowed amount
A lower Medicare-allowed amount than 85% of clinicians listed under Dermatology in Torrance, CA (2024, 24 clinicians with data). Median for this group: $117,775. Middle half: $56,656 to $307,356.
A lower Medicare-allowed amount than 85% of clinicians listed under Dermatology in California (2024, 1,168 clinicians with data). Median for this group: $174,429. Middle half: $66,277 to $372,447.
Paid by Medicare
A lower Medicare payment amount than 85% of clinicians listed under Dermatology in Torrance, CA (2024, 24 clinicians with data). Median for this group: $85,888. Middle half: $38,841 to $218,111.
A lower Medicare payment amount than 85% of clinicians listed under Dermatology in California (2024, 1,168 clinicians with data). Median for this group: $125,261. Middle half: $46,635 to $274,791.
Medicare Part D prescriptions
Fewer Part D prescriptions than 75% of clinicians listed under Dermatology in Torrance, CA (2024, 27 clinicians with data). Median for this group: 566. Middle half: 173 to 1,138.
Fewer Part D prescriptions than 75% of clinicians listed under Dermatology in California (2024, 1,474 clinicians with data). Median for this group: 461. Middle half: 180 to 904.
Part D drug cost
A lower Part D drug cost than 80% of clinicians listed under Dermatology in Torrance, CA (2024, 27 clinicians with data). Median for this group: $58,380. Middle half: $4,072 to $185,310.
A lower Part D drug cost than 80% of clinicians listed under Dermatology in California (2024, 1,474 clinicians with data). Median for this group: $65,584. Middle half: $5,909 to $248,782.
37 active clinicians are listed under Dermatology with a practice address in Torrance, CA (2,084 in California).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Torrance
10.8% of these 37 clinicians have the CMS telehealth indicator.
70.3% of these 37 clinicians are listed by CMS as accepting Medicare assignment.
CMS data by year
Changes may reflect reporting, coverage or privacy limits, not changes in care quality.
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Medicare Part B services
Medicare Part B services decreased 91% from 7,010 in 2020 to 634 in 2024.
- 2020: 7,010
- 2021: 5,204
- 2022: 2,927
- 2023: 3,848
- 2024: 634
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Medicare-allowed amount
Medicare-allowed amount decreased 95% from $691,437 in 2020 to $33,564 in 2024.
- 2020: $691,437
- 2021: $502,216
- 2022: $190,565
- 2023: $360,926
- 2024: $33,564
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Paid by Medicare
Paid by Medicare decreased 96% from $516,819 in 2020 to $19,254 in 2024.
- 2020: $516,819
- 2021: $377,950
- 2022: $130,820
- 2023: $265,737
- 2024: $19,254
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Medicare Part D prescriptions
Medicare Part D prescriptions decreased 82% from 847 in 2020 to 152 in 2024.
- 2020: 847
- 2021: 748
- 2022: 406
- 2023: 356
- 2024: 152
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30-day fills
30-day fills decreased 82% from 906 in 2020 to 163 in 2024.
- 2020: 906
- 2021: 826
- 2022: 429
- 2023: 380
- 2024: 163
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Part D drug cost
Part D drug cost decreased 98% from $138,646 in 2020 to $3,309 in 2024.
- 2020: $138,646
- 2021: $70,428
- 2022: $15,981
- 2023: $10,908
- 2024: $3,309
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Industry payments (Open Payments)
Industry payments (Open Payments) went from $104.77 in 2021 to $13.12 in 2025.
- 2021: $104.77
- 2022: $25.70
- 2023: $52.29
- 2024: $71.06
- 2025: $13.12
Sources: CMS Medicare Physician & Other Practitioners (2024), CMS Medicare Part D Prescribers (2024), CMS Open Payments (2025), CMS Doctors and Clinicians, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.
Text: T-MedInfo · Report an error.
Pharma & Medical Device Financial Disclosures
Payments and other transfers of value that drug and medical device companies reported to CMS Open Payments
Program year 2025 (payments made January 1 – December 31, 2025): fewer than 11 records totaling $13.12.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| Organon LLC |
Food and Beverage
In-kind items and services
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VTAMA | General | $13.12 |
Source: CMS Open Payments, program year 2025, released June 30, 2026.
Performed Procedures & Service Volume
CPT® is a registered trademark of the American Medical Association. CPT codes, descriptions and other data only are copyright 2016–2023 American Medical Association. All rights reserved. Applicable FARS/HHSARS apply. Descriptions of CPT codes are the AMA's CPT Consumer Friendly Descriptors as published by CMS in the Medicare Physician & Other Practitioners – by Provider and Service data, 2017–2024; they are plain-language summaries, not for clinical coding or documentation. HCPCS Level II codes and descriptions are from CMS. Fee schedules, relative value units, conversion factors and/or related components are not assigned by the AMA, are not part of CPT, and the AMA is not recommending their use. The AMA does not directly or indirectly practice medicine or dispense medical services. The AMA assumes no liability for data contained or not contained herein.
| HCPCS Code | Services | Patients | Submitted Charge | Medicare Allowed |
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17003
Destruction of precancer skin growth, 2-14 growths
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293 | 69 | $15.00 | $7.60 |
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99213
Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more
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200 | 197 | $197.00 | $98.62 |
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17000
Destruction of precancer skin growth, 1 growth
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93 | 91 | $151.00 | $67.84 |
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11102
Biopsy of related skin growth, first growth
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31 | 29 | $227.00 | $102.33 |
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17110
Destruction of skin growth, 1-14 growths
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17 | 17 | $259.00 | $125.41 |
Source: CMS Part B by Provider and Service, 2024; services under 11 beneficiaries omitted by CMS. Privacy limits
Submitted charges are billed amounts, not a price quote for your visit.
Medicare Part D Prescribing Profile & Medications
Medicare Part D prescriptions filled, including refills, in 2024.
| Brand Name | Generic Name | Prescriptions | Day Supply | Total Cost | Patients |
|---|---|---|---|---|---|
| Triamcinolone Acetonide | Triamcinolone Acetonide | 41 | 1,280 | $245.03 | 35 |
| Ketoconazole | Ketoconazole | 40 | 1,320 | $452.71 | 12 |
| Ciclopirox | Ciclopirox | 30 | 880 | $1,031.61 | 11 |
| Valacyclovir | Valacyclovir Hcl | 15 | 109 | $179.10 | — |
| Fluocinonide | Fluocinonide | 13 | 375 | $461.01 | — |
| Fluorouracil | Fluorouracil | 13 | 390 | $939.63 | 13 |
Source: CMS Part D by Provider and Drug, 2024; rows below 11 claims omitted by CMS; volume isn’t quality. Privacy limits
Specialties & License Numbers Reported to NPPES
NUCC Taxonomy Code: 207N00000X
A dermatologist is trained to diagnose and treat pediatric and adult patients with benign and malignant disorders of the skin, mouth, external genitalia, hair and nails, as well as a number of sexually transmitted diseases. The dermatologist has had additional training and experience in the diagnosis and treatment of skin cancers, melanomas, moles and other tumors of the skin, the management of contact dermatitis and other allergic and nonallergic skin disorders, and in the recognition of the skin manifestations of systemic (including internal malignancy) and infectious diseases. Dermatologists have special training in dermatopathology and in the surgical techniques used in dermatology. They also have expertise in the management of cosmetic disorders of the skin such as hair loss and scars and the skin changes associated with aging.
NUCC Taxonomy Code: 207ND0101X
The highly-trained surgeons that perform Mohs Micrographic Surgery are specialists both in dermatology and pathology. With their extensive knowledge of the skin and unique pathological skills, they are able to remove only diseased tissue, preserving healthy tissue and minimizing the cosmetic impact of the surgery. Mohs surgeons who belong to the American College of Mohs Surgery (ACMS) have completed a minimum of one year of fellowship training at one of the ACMS-approved training centers in the U.S.
NUCC Taxonomy Code: 207ND0900X
A dermatopathologist has the expertise to diagnose and monitor diseases of the skin including infectious, immunologic, degenerative and neoplastic diseases. This entails the examination and interpretation of specially prepared tissue sections, cellular scrapings and smears of skin lesions by means of routine and special (electron and fluorescent) microscopes.
NUCC Taxonomy Code: 207NI0002X
A dermatologist who utilizes various specialized laboratory procedures to diagnose disorders characterized by defective responses of the body's immune system. Immunodermatologists also may provide consultation in the management of these disorders and administer specialized forms of therapy for these diseases.
NUCC Taxonomy Code: 207NP0225X
A pediatric dermatologist has, through additional special training, developed expertise in the treatment of specific skin disease categories with emphasis on those diseases which predominate in infants, children and adolescents.
NUCC Taxonomy Code: 207NS0135X
Procedural Dermatology, a subspecialty of Dermatology, encompassing a wide variety of surgical procedures and methods to remove or modify skin tissue for health or cosmetic benefit. These methods include scalpel surgery, laser surgery, chemical surgery, cryosurgery (liquid nitrogen), electrosurgery, aspiration surgery, liposuction, injection of filler substances, and Mohs micrographic controlled surgery (a special technique for the removal of growths, especially skin cancers).
Additional State Medicaid & Healthcare Payer Identifiers
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - DERMATOLOGY
I20050405001320
CA
6305893959
Sources: CMS Provider Enrollment and Order and Referring. Medicare enrollment is a billing status, not an accreditation or quality rating.
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Dermatology
Dermatology
Doctor of Medicine (M.D.)
Career & Practice History
NPI enumerated June 09, 2006.
No changes to the name, practice address, taxonomy or NPI status in this record have been observed in the monthly NPPES data files from January 2017 to August 2026.
NPI Administrative Meta
Other Dermatology Specialists in Torrance
- Dr. Vernon Wilson, MD
- Dr. Noah Craft, MD
- Dr. Yasmin Qaseem, MD
- David Horowitz
- Dr. Sree Karukonda, MD
- Dr. Shirlene Jay, MD
Mailing Address
23550 Hawthorne Blvd., #200
Torrance, CA 905054722
Phone: 3105349131