Jeffrey D. Gross, MD

Medicare activity in 2024

Official CMS public-use data for Jeffrey D. Gross, 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. Insertion of needle into vein for collection of blood sample (36415)444 services
2. Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)334 services
3. Blood test, comprehensive group of blood chemicals (80053)264 services
4. Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count (85025)260 services
5. Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit (G0439)247 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%
• High blood pressure63%
• Arthritis38%
• Ischemic heart disease27%
• Chronic kidney disease20%
• Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)20%

Hospitals where Jeffrey D. Gross works

Medicare's Facility Affiliation Data lists Jeffrey D. Gross 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.

• Northern Westchester HospitalMount Kisco, NY · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 330162

Practice locations

Addresses where Jeffrey D. Gross is enrolled with Medicare (CMS data updated October 2, 2026).

• 440 Mamaroneck Ave, Suite 400Harrison, NY 10528 (914) 231‑8494
• 90 S Bedford RdMount Kisco, NY 10549 (914) 241‑1050

Group practices

Medicare enrollment lists Jeffrey D. Gross as a member of these groups (CMS data updated October 2, 2026).

• Optum Medical Care PC1,010 clinicians in the group
• North Shore - Lij Internal Medicine at Lynbrook PC6 clinicians in the group

Specialties

• Internal Medicineprimary

Find other Internal Medicine doctors in New York →

Other internal medicine doctors in Harrison

Clinicians with the same Medicare primary specialty in Harrison, NY — not a recommendation.

• Thomas M. Karoff, DO
• David M. Goldberg, MD
• Erica D. Goldberger, MD
• Vahid Davoudi, MD
• Bradley K. Adler, MD
• David T. Yung, MD
• Deborah E. Finkelstein, MD
• Sarah M. Teague, MD

All internal medicine doctors in Harrison →

Other clinicians in Optum Medical Care PC

Medicare enrollment lists these clinicians in the same group practice — not a recommendation.

• Jeffrey B. Katz, MD
• Alex B. Neufeld
• Nelson Barcelon, MD
• Marguerite R. Shifrin
• Davina Chen
• Babar Hassan, MD

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