Mark David Horowitz, MD
Internal Medicine Physician · New York, NY
Mark David Horowitz, MD is an internal medicine physician with a practice address in New York, New York, and NPI 1154490530, issued on Nov 7, 2006. Check the license (New York 1613581, as entered in NPPES) on the NYS Education Department, Office of the Professions; the Medicare figures below come from public CMS files.
- Name
- Mark David Horowitz
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 1613581 NY
Self-reported in NPPES; status is on the state search - Practice location
- 21 East 90TH St, New York, NY 10128
- Phone
- (212) 860-3077
- Enumerated
- Nov 7, 2006
- Record last updated
- Sep 11, 2025
- Fax
- (212) 410-7410
- Medicare enrollment
- Enrolled (PECOS I20110517000475); accepts Medicare assignment
- Medical or professional school
- Northeastern Ohio University College Of Medicine, 1983
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 12,067 in New York → Look up another NPI →
Verify Mark David Horowitz in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNYS Education Department, Office of the Professions
Search for license 1613581Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
6% fewer Medicare Part D claims than the average internal medicine physician in 2024
2,971 Medicare Part D claims for 316 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 14% of claims. 30 claims were for opioids.
Most prescribed
- Levothyroxine Sodium226 claims
- Atorvastatin Calcium202 claims
- Rosuvastatin Calcium108 claims
- Azithromycin94 claims
- Prednisone92 claims
- Amlodipine Besylate80 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 MIPS final score for 2023 (Medicare payment program): 13.1 of 100
The Merit-based Incentive Payment System score is reported for this clinician. 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; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $1,455.72
47 payments; by number, the most common kind was food and beverage; the largest payer was Amgen Inc. 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.
Mark David Horowitz among 12,067 internal medicine physician records in New York
Mark David Horowitz, MD is one of 12,067 internal medicine physician records with a practice address in New York. 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 8% of them.
- NPI issued2006 · 8% of these records are older, 53% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated1983 · median 2002 among the 7,221 with a school on file
- Record last updated2025 · 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 New York practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
2,434 internal medicine physician records list a practice address in New York
They are 2,434 of the 98,468 NPPES records with a practice address in New York, and 12,067 internal medicine physician records in New York.
All 12,067 in New York → Every provider in New York → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
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- Anna Lef, MDNew York, NY 101281659477321
- Vicki Lopachin, M.D.New York, NY 101281922079748
Common questions
What is Mark David Horowitz, MD's NPI number?
Mark David Horowitz, MD's National Provider Identifier (NPI) is 1154490530, issued on Nov 7, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mark David Horowitz, MD located?
The NPPES record lists a practice address at 21 East 90TH St, New York, NY, 10128. Phone: (212) 860-3077. Providers update this record themselves, so call before visiting.
How can I verify Mark David Horowitz, MD's license?
NPPES lists New York license number 1613581, as entered by the provider. Search the NYS Education Department, Office of the Professions at https://www.op.nysed.gov/services/verifications/online-verification-searches. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Mark David Horowitz, MD prescribe under Medicare Part D?
In 2024, Mark David Horowitz, MD had 2,971 Medicare Part D claims for 316 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Mark David Horowitz, MD's MIPS final score?
The 2023 MIPS final score is 13.1 of 100. 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.