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Edit this profileAt a glance
- 21 East 90Th St, New York, NY 10128
About Dr. Horowitz
Based in New York, NY, Mark D. Horowitz, MD is listed in the NPI registry under internal medicine. Mark graduated from Northeastern Ohio University College of Medicine in 1983. Mark is also listed as specializing in rheumatology. According to Medicare claims data, Mark cared for 1,742 Medicare patients across 4,528 services. The services billed most often include established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more, established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more, and insertion of needle into vein for collection of blood sample. NPI 1154490530 identifies this record in the national registry.
Factual summary compiled by Guide.md from public records; not written by this provider.
Education & Training
Specialty
Credentials & Licensing
Medicare information
Exactly as CMS reports it (National Downloadable File, Opt-Out Affidavits, Order & Referring). Not an insurance directory; confirm coverage with the office.
Contact Information
- (212) 860-3077
- Email not available
Practice Locations
21 EAST 90TH ST
New York, NY 10128
Conditions Commonly Evaluated or Treated
Within Internal Medicine generally. Availability varies by clinician, training and location — this profile has not been claimed, so nothing here is a personal claim by the provider.
Conditions
Most searched conditions
- Allergies
- Diabetes
- Flu
- Hypothyroidism
- Strep throat
- UTI
Cardiometabolic
Digestive and liver
Endocrine, blood, and bone
Infectious disease
Kidney and urinary
Respiratory
Blood & Circulation
Blood disorders
Brain & Nerves
Brain and nerves
Cardiac and vascular
Digestive
Heart & Circulation
Infections
Kidney & Bladder
Lungs & Breathing
Mental Health
Neurologic and behavioral
Pain
Rheumatologic and pain
Procedures & services
Most searched procedures
- Annual physical
- Blood test
- Flu shot
- Medicare wellness visit
- Sick visit
- TB test
- Well-woman exam
Preventive and evaluation
- Medication management
- Post-hospital transitional care
Screening and diagnostic testing
Bones & Joints
Brain and nerves
Cancer screening
- Colon Cancer Screening Referral
- Mammogram Referral
Digestive
Exams & Consultations
Heart & Circulation
Heart health
- Cardiac Stress Test Referral
Imaging referral
- Abdominal Ultrasound Referral
Immunizations
Lab tests
Lungs & Breathing
- At-Home Sleep Study Order
Metabolic & Weight
- Weight Loss Injections and Medication
Minor procedures
Office procedures
Office Procedures
- Skin Tag and Mole Removal
- Vitamin B12 Injections
- Wart Removal
Pain management
Preventive & Routine Care
Screenings & Diagnostics
Sexual health
Procedures Most Often Billed to Medicare
4,528 services · 1,742 patients · 13 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Insertion of needle into vein for collection of blood sample | Procedure | 36415 |
645 | More than most peers in Internal Medicine |
| Aspiration and/or injection of fluid from large joint | Procedure | 20610 |
32 | As often as other peers in Internal Medicine |
| Test to measure expiratory airflow and volume changes before and after medication administration | Treatment | 94060 |
238 | More than most peers in Internal Medicine |
| Ultrasound study of arm and leg arteries | Treatment | 93922 |
210 | More than most peers in Internal Medicine |
| Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report | Treatment | 93000 |
161 | More often than most peers in Internal Medicine |
| Influenza vaccine, trivalent derived from cell cultures | Treatment | 90661 |
78 | More often than most peers in Internal Medicine |
| Administration of vaccine | Treatment | 90471 |
64 | More than most peers in Internal Medicine |
| Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more | Office visit | 99214 |
2,050 | More than most peers in Internal Medicine |
| Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more | Office visit | 99215 |
824 | More than most peers in Internal Medicine |
| Administration of influenza virus vaccine | Billing code | G0008 |
79 | More often than most peers in Internal Medicine |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Related specialists at this location 1
Clinically related specialties at the same address — the people this provider most likely works alongside.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
Other internists in New York 8
Same specialty, same city.
More connections — 24 related providers in 3 groups
Trained at Northeastern Ohio University College of Medicine 8
Other providers in the same specialty who trained at the same institution.
Class of 1983 at Northeastern Ohio University College of Medicine 8
Providers who graduated from the same medical school in the same year.
Also performs Insertion of needle into vein for collection of blood sample 8
Providers in NY who bill this service to Medicare most often.
Common questions
What kind of doctor is Dr. Horowitz?
Dr. Horowitz is an internist in New York, NY. That is the designation recorded for this NPI in the federal registry, where it is listed as “Internal Medicine”.
NPI registry
What is Dr. Horowitz's address?
Dr. Horowitz is listed at 21 East 90Th St, New York, NY 10128. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How can I make an appointment with Dr. Horowitz?
The number on file is (212) 860-3077. Contact the office directly to confirm availability and scheduling.
NPI registry
What is Dr. Horowitz's NPI number?
Dr. Horowitz's National Provider Identifier is 1154490530. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
Where did Dr. Horowitz train?
Dr. Horowitz attended Northeastern Ohio University College of Medicine, graduating in 1983. This comes from the CMS National Downloadable File.
CMS public data
How long has Dr. Horowitz been practicing?
Dr. Horowitz has 43 years experience. Calculated from a graduation year of 1983, reported in the CMS National Downloadable File.
CMS public data
What procedures does Dr. Horowitz perform?
According to Medicare billing data, Dr. Horowitz performs procedures including insertion of needle into vein for collection of blood sample and aspiration and/or injection of fluid from large joint; provides treatments such as test to measure expiratory airflow and volume changes before and after medication administration and ultrasound study of arm and leg arteries, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has Dr. Horowitz confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Horowitz. If this is you, claiming it is free.
Guide.md
Guide.md listings do not constitute medical advice or an endorsement.