Dr. Steven Gruenstein, MD

Dr. Gruenstein practices at Port Jefferson Station Medical Oncology in Ridge, New York.

Dr. Gruenstein's NPI, 1407855307, was assigned on July 21, 2005. Dr. Gruenstein graduated from Univ Genoa- Fac Med in 1983. Dr. Gruenstein holds New York license 1776051.

Dr. Gruenstein's primary practice is Port Jefferson Station Medical Oncology, at 1 Research Rd, Ridge, NY 11961. The practice phone is (631) 751-3000.

Dr. Gruenstein's primary practice is Port Jefferson Station Medical Oncology in Ridge, New York. Dr. Gruenstein is also affiliated with Lenox Hill Hospital. The medical group on file is New York Cancer & Blood Specialists.

Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Gruenstein practices, 2 sites in all. Vendor and product names are available with a free account.

Hematology and oncology is Dr. Gruenstein's primary specialty in the NPI Registry, under taxonomy code 207RH0003X. Dr. Gruenstein is board certified in hematology by the American Board of Internal Medicine. Dmand AI has Dr. Gruenstein's licenses on file in 2 states: New York and New Jersey.

Dmand AI lists breast cancer, chronic anemia, chronic leukemia, colorectal cancer, fluid and electrolyte imbalances, immune deficiency disease, lung cancer and lymphoma among the conditions Dr. Gruenstein treats.

CMS data shows 109,830 Medicare services from Dr. Gruenstein across 84 procedure codes in 2024, for 1,278 Medicare patients. Medicare paid $959,647 for them.

CMS counts 1,278 Medicare patients who saw Dr. Gruenstein in 2024. The largest group is 75 to 84, with 585 patients. 75% of them have high cholesterol, and 73% have high blood pressure. 9% are also on Medicaid. Their average risk score is 1.59, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.

Across all payers, Dmand AI patient panel data puts Dr. Gruenstein's median patient age at 61, with 60% women.

In 2024, Dr. Gruenstein wrote 1,673 Medicare Part D claims for 245 patients. 54% of them were for generic drugs. CMS names the drug for 1,270 of them, across 40 drugs with 11 or more claims each, at $3,397,738 in total drug cost. In 2023, CMS named 1,168 claims across 36 drugs.

CMS publishes a Merit-based Incentive Payment System (MIPS) score of 100 out of 100 for Dr. Gruenstein for performance year 2024, reported as part of a group. Dr. Gruenstein accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Gruenstein as offering telehealth.

Dmand AI links 3 papers to Dr. Gruenstein, published from 2009 to 2014. Dr. Gruenstein's most frequent co-author is Shyamala Chendeal Navada, MD.

CMS Open Payments shows 134 general payments to Dr. Gruenstein from 39 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 92% of the total. AstraZeneca Pharmaceuticals LP paid the most, $424.

Dmand AI lists 5 awards for Dr. Gruenstein, most recently America's Top Doctors in 2014.

Dr. Gruenstein graduated from Univ Genoa- Fac Med in 1983.

Dr. Gruenstein is in network with 8 carriers, including Aetna, Blue Cross Blue Shield of Massachusetts and Cigna. Medicare plans come from the most carriers, 7. Check the plan with the practice before a visit.