Karen M. Kostroff, MD

Medicare activity in 2024

Official CMS public-use data for Karen M. Kostroff, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.

Most frequent services

1. Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)1,044 services
2. New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more (99205)61 services
3. New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)49 services
4. Partial removal of breast (19301)39 services
5. Biopsy or removal of deep lymph nodes of underarm (38525)24 services

Chronic conditions among these patients

Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).

• High cholesterol75%
• Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)75%
• High blood pressure66%
• Arthritis48%
• Osteoporosis41%
• Anxiety26%

Hospitals where Karen M. Kostroff works

Medicare's Facility Affiliation Data lists Karen M. Kostroff at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.

• Boca Raton Regional HospitalBoca Raton, FL · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 100168
• Long Island Jewish Medical CenterNew Hyde Park, NY · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 330195
• North Shore University HospitalManhasset, NY · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 330106
• St Francis Hospital - The Heart CenterRoslyn, NY · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 330182

Practice locations

Addresses where Karen M. Kostroff is enrolled with Medicare (CMS data updated October 2, 2026).

• 2001 Marcus Ave, Suite West270New Hyde Park, NY 11042 (516) 775‑7676
• 270 -05New Hyde Park, NY 11040 (718) 470‑8011

Specialties

• General Surgeryprimary

Find other General Surgery doctors in New York →

Other general surgeons in New Hyde Park

Clinicians with the same Medicare primary specialty in New Hyde Park, NY — not a recommendation.

• Andrew Y. Lee, MD
• Paul Chung, MD
• Marc L. Greenwald, MD
• Ira Klonsky, MD
• Nabil Dagher, MD
• Alex Lee, MD
• Ronald Allan E. Dela Cruz, MD
• Gary M. Kline, MD

All general surgeons in New Hyde Park →

Clinician information

Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.

Sources

1. Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
2. Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
3. National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
4. Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
5. NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
6. Medicare Care Compare — official Medicare tool to look up clinicians