Medicare Enrolled
Dr. Steven Gruenstein, M.D.
Hematology & Oncology · New York, NY
Practice pattern: Mixed Practice
— Diverse clinical practice across multiple procedure types
Low-engagement
Very High
DATA COVERAGE
Data in 4 of 4 federal sources
Measures public federal data availability — not provider quality
Informational, not a quality rating.
This page presents federal public records about Dr. Gruenstein from CMS (NPPES, Open Payments, Medicare Provider Utilization, PECOS). It is not medical advice, an endorsement, or a judgment of clinical quality. Always consult the provider directly and a licensed clinician for medical decisions. Read methodology →
Are you Dr. Gruenstein?
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What this data tells you about Dr. Gruenstein
Dr. Steven Gruenstein is a hematology & oncology specialist in New York, NY, with 20 years of NPI registration. Based on federal Medicare data, Dr. Gruenstein performed 156,078 Medicare services across 15,737 unique beneficiaries.
Between the years covered by Open Payments, Dr. Gruenstein received a total of $2,738 from 39 pharmaceutical and/or device companies across 129 individual payments. These payments are legal, publicly disclosed under the federal Sunshine Act, and common in hematology & oncology. Most payments are for meals and travel — low-value interactions common across virtually all practicing physicians. Patients may wish to discuss these relationships with their provider.
The Data Coverage level for Dr. Gruenstein is Very High — reflecting how much public federal data is available about this provider. Patients are encouraged to use this data as one of several factors when choosing a healthcare provider.
✓ 20 years in practice
▲ Top 4% volume in NY
$2,738 industry payments
Medicare Practice Summary
Medicare Utilization ↗156,078
Medicare services
Top 4% in NY for hematology & oncology
15,737
Unique beneficiaries
$8
Avg. Medicare payment
Medicare patients only (65+ / disabled) · How to read this →
~7,804 Medicare services per year of practice
Top procedures by volume
Ranked by number of services performed for Medicare patients. Avg. submitted charge is what the provider billed; avg. Medicare payment is what CMS paid.
| Procedure | Volume | Avg. paid | Avg. submitted |
|---|---|---|---|
| Iron infusion (Injectafer) An intravenous injection of ferric carboxymaltose, an iron replacement medication. |
80,250 | $1 | $5 |
| Darbepoetin injection (Aranesp) for anemia An injection of darbepoetin alfa used for non-end-stage renal disease purposes. |
16,400 | $2 | $20 |
| Flow cytometry, additional marker An additional marker is tested during a flow cytometry procedure to analyze DNA or cells. This step adds specific data points to the initial analysis. |
8,879 | $23 | $108 |
| Denosumab injection (Prolia/Xgeva) | 7,440 | $18 | $103 |
| Iron sucrose injection (Venofer) An injection of iron sucrose used to replenish iron levels in the body. |
6,801 | $0 | $1 |
| Blood draw (venipuncture) Insertion of a needle into a vein to collect a blood sample. |
3,023 | $8 | $20 |
| Complete blood count (CBC) with differential An automated laboratory test that measures the levels of red blood cells, white blood cells, and platelets in the blood, including a breakdown of the different types of white blood cells. |
2,839 | $8 | $150 |
| Comprehensive metabolic blood panel A blood test that measures a group of chemicals, including glucose, electrolytes, and kidney and liver function markers. |
2,583 | $10 | $60 |
| Phosphate level test A blood test that measures the amount of phosphate in your body. Phosphate is a mineral that helps keep bones and teeth strong. |
2,356 | $5 | $50 |
| Lactate dehydrogenase (LDH) level test A blood test that measures the amount of lactate dehydrogenase, an enzyme found in many body tissues. It helps assess tissue damage or disease. |
2,297 | $6 | $30 |
| Magnesium level test A blood test to measure the amount of magnesium in your body. This helps check for magnesium deficiency or excess. |
2,290 | $7 | $75 |
| Uric acid level test A blood test that measures the level of uric acid in your body. Uric acid is a waste product formed when the body breaks down purines. |
2,277 | $4 | $50 |
| Office visit, established patient (30-39 min) A follow-up office visit for an existing patient lasting between 30 and 39 minutes. The visit involves medical evaluation and management of the patient's condition. |
1,834 | $113 | $456 |
| Dexamethasone injection (steroid) An injection of dexamethasone sodium phosphate, a corticosteroid medication, administered in a dose of 1 milligram. |
1,819 | $0 | $10 |
| Ferritin level test (iron stores) A blood test that measures the level of ferritin, a protein that stores iron in the body. |
1,265 | $13 | $150 |
| Iron level test | 1,246 | $6 | $70 |
| Iron binding capacity test A blood test that measures the amount of iron in the blood and the blood's ability to bind and transport iron. |
1,246 | $9 | $125 |
| Immunoglobulin level test A blood test that measures the level of gammaglobulins, which are immune system proteins. |
897 | $9 | $45 |
| Chronic care management, first 20 min/month This service covers the first 20 minutes of clinical staff time directed by a healthcare professional each calendar month to manage chronic conditions. |
831 | $56 | $150 |
| Erythrocyte sedimentation rate (ESR) test A blood test that measures how quickly red blood cells settle in a test tube to detect inflammation in the body. This specific method is performed manually rather than using an automated machine. |
593 | $4 | $20 |
| Immunoglobulin light chain measurement A blood test that measures the levels of immunoglobulin light chains, which are proteins produced by plasma cells. |
531 | $17 | $70 |
| Drug injection, under skin or into muscle A procedure involving the administration of a medication or substance via injection into the subcutaneous tissue or muscle. |
522 | $13 | $190 |
| Vitamin B-12 level test A blood test that measures the amount of vitamin B-12 in your body. |
449 | $15 | $75 |
| Office visit, established patient (20-29 min) An office visit for an existing patient lasting between 20 and 29 minutes. The visit involves medical evaluation and management of the patient's condition. |
433 | $84 | $300 |
| Serum protein measurement A blood test that measures the total amount of protein in the serum. It helps evaluate overall health and nutritional status. |
417 | $11 | $60 |
| Flow cytometry DNA or cell analysis, first marker A laboratory test that uses a laser to analyze cells or DNA by detecting a specific marker on the cell surface or within the cell. |
388 | $73 | $300 |
| Serum immunofixation test A laboratory test that analyzes a blood serum sample to identify specific abnormal proteins. The procedure uses an immunologic technique to detect and characterize these proteins. |
386 | $22 | $110 |
| Manual red blood cell count A laboratory test that manually counts the number of red blood cells in a blood sample. |
371 | $4 | $15 |
| Folic acid level test A blood test that measures the amount of folic acid in the serum. |
283 | $14 | $70 |
| Office visit, established patient, complex (40-54 min) An office or outpatient visit for an existing patient lasting between 40 and 54 minutes. This level of service is determined by the total time spent on the date of the encounter. |
260 | $162 | $940 |
| Intravenous injection of additional new drug or substance Administration of an additional new medication or substance directly into a vein. |
251 | $15 | $95 |
| Intravenous chemotherapy infusion, 1 hour or less Administration of chemotherapy medication directly into a vein. The procedure takes one hour or less to complete. |
236 | $129 | $550 |
| Carcinoembryonic antigen (CEA) level test A blood test that measures the level of carcinoembryonic antigen (CEA) protein. This test is used to monitor certain types of cancer. |
224 | $19 | $60 |
| Thyroid stimulating hormone (TSH) test A blood test that measures the level of thyroid stimulating hormone to evaluate thyroid function. |
218 | $16 | $150 |
| Additional sequential IV infusion, 1 hour or less This code represents an additional intravenous infusion administered sequentially to a primary infusion. It covers the administration time of one hour or less. |
200 | $28 | $120 |
| PSA test (prostate cancer screening) | 197 | $18 | $50 |
| Haptoglobin level test A blood test that measures the amount of haptoglobin, a protein in the serum. It helps evaluate red blood cell breakdown. |
189 | $12 | $75 |
| Beta-2 microglobulin level test A blood test that measures the level of beta-2 microglobulin, a protein produced by cells in the body. |
182 | $16 | $50 |
| Hemoglobin A1c test (diabetes monitoring) A blood test that measures your average blood sugar levels over the past two to three months. |
177 | $10 | $50 |
| High-sensitivity C-reactive protein test A blood test that measures high-sensitivity C-reactive protein to detect infection or inflammation. |
162 | $13 | $50 |
| Vitamin D level test A blood test to measure the amount of Vitamin D-3 in your body. |
158 | $29 | $150 |
| Prothrombin time test (blood clotting) A laboratory test that measures how long it takes for blood to clot. This procedure evaluates the body's coagulation process. |
149 | $4 | $30 |
| IgE level test A blood test that measures the level of immunoglobulin E (IgE) proteins in the immune system. |
146 | $16 | $50 |
| New patient office visit (45-59 min) An initial office visit for a new patient lasting between 45 and 59 minutes. This code covers the total time spent by the physician or qualified healthcare professional on the date of the encounter. |
142 | $148 | $595 |
| Intravenous drug injection A procedure involving the administration of a medication or substance directly into a vein. |
126 | $36 | $190 |
| Coagulation assessment blood test A blood test that measures how long it takes for blood to clot. The sample can be plasma or whole blood. |
106 | $6 | $35 |
| Diphenhydramine injection, up to 50 mg An injection of diphenhydramine hydrochloride, an antihistamine medication, administered in a dose of up to 50 milligrams. |
97 | $1 | $10 |
| Intravenous infusion, 1 hour or less Administration of medication or fluid directly into a vein for therapeutic, preventive, or diagnostic purposes. The procedure lasts one hour or less. |
90 | $63 | $500 |
| Vitamin B-12 injection An injection of vitamin B-12 (cyanocobalamin) with a dose of up to 1000 mcg. |
88 | $1 | $10 |
| Zoledronic acid injection, 1 mg An injection of zoledronic acid administered at a dose of 1 mg. |
88 | $7 | $160 |
| Intravenous infusion of new drug or substance, 1 hour or less This procedure involves administering a new medication or substance directly into a vein through an existing access site. The infusion is completed within one hour or less. |
76 | $64 | $420 |
| Additional hour of intravenous chemotherapy This code represents the administration of chemotherapy medication into a vein for each additional hour beyond the initial period. |
74 | $27 | $125 |
| Injection, fosnetupitant 235 mg and palonosetron 0.25 mg | 70 | $353 | $2,100 |
| Free thyroxine (T4) test A blood test that measures the level of free thyroxine, a thyroid hormone, in the bloodstream. |
68 | $9 | $30 |
| Coagulation function measurement, d-dimer; quantitative | 68 | $10 | $75 |
| Acute hepatitis panel A blood test that screens for markers of acute viral hepatitis infection. |
62 | $47 | $175 |
| Total bilirubin level test A blood test that measures the total amount of bilirubin, a waste product from the breakdown of red blood cells, in your body. |
62 | $5 | $15 |
| CA 19-9 tumor antigen test A blood test that measures the level of CA 19-9, a substance that can be found in the blood of some people with cancer. This quantitative analysis detects and measures the specific tumor antigen. |
62 | $20 | $50 |
| Direct bilirubin level test A blood test that measures the amount of direct bilirubin in your body. Direct bilirubin is the form of the waste product processed by the liver. |
60 | $5 | $25 |
| Additional hour of intravenous infusion This code represents each additional hour of intravenous infusion beyond the initial hour for therapy, prevention, or diagnosis. |
55 | $20 | $75 |
| Immunologic analysis for detection of tumor antigen, quantitative; ca 125 | 51 | $20 | $50 |
| Total testosterone level test A blood test that measures the total amount of testosterone in your body. This hormone is important for various bodily functions in both men and women. |
50 | $25 | $300 |
| Immunologic analysis for detection of tumor antigen, quantitative; ca 15-3 | 50 | $20 | $70 |
| Venipuncture for blood collection A procedure to draw blood from a vein for medical testing or analysis. |
50 | $96 | $400 |
| Intravenous push injection of new drug or substance A healthcare provider injects a new medication or substance directly into a vein using a push technique. |
46 | $55 | $250 |
| Cardiolipin antibody (tissue antibody) measurement | 44 | $25 | $250 |
| Subcutaneous or intramuscular chemotherapy injection This procedure involves administering anti-cancer hormonal medication through an injection into the tissue under the skin or into a muscle. |
42 | $33 | $120 |
| Beta 2 glycoprotein 1 antibody (autoantibody) measurement | 41 | $25 | $150 |
| Additional hour of intravenous hydration This code represents each additional hour of intravenous fluid administration beyond the initial hour. It is used to bill for extended hydration therapy. |
40 | $12 | $80 |
| New patient office visit, complex (60-74 min) | 39 | $205 | $780 |
| Bone marrow biopsy and aspiration A procedure to remove a small sample of bone marrow and liquid for laboratory testing. The sample is analyzed to help diagnose various medical conditions. |
37 | $170 | $875 |
| Lipid panel (cholesterol and triglycerides) A blood test that measures cholesterol and triglyceride levels. |
36 | $13 | $300 |
| Fibrinogen activity test A blood test that measures the activity level of fibrinogen, a protein essential for blood clotting. |
36 | $9 | $85 |
| Blood smear for iron A laboratory test that examines a drop of blood under a microscope to evaluate iron levels and red blood cell characteristics. |
36 | $7 | $20 |
| Urinalysis, manual A manual laboratory examination of a urine sample to check for various substances and cells. |
32 | $3 | $50 |
| Hospital follow-up visit, high complexity Subsequent hospital inpatient or observation care for an existing patient involving high-level medical decision making, with at least 50 minutes total time on the date of the encounter. |
31 | $109 | $380 |
| Principal care management for high-risk disease, first 30 minutes This service covers the initial 30 minutes of clinical staff time per calendar month to manage a single high-risk disease. It is directed by a healthcare professional. |
31 | $56 | $226 |
| Total cortisol level test A blood test that measures the total amount of cortisol hormone in your body. Cortisol is a hormone produced by the adrenal glands. |
28 | $16 | $75 |
| Calreticulin gene analysis A laboratory test that analyzes the calreticulin gene for common genetic variants. |
26 | $119 | $490 |
| Gene analysis (janus kinase 2) variant | 26 | $90 | $370 |
| JAK2 gene analysis A laboratory test that examines the JAK2 gene to identify specific genetic variations. |
26 | $182 | $741 |
| MPL gene analysis for common variants A laboratory test that analyzes the MPL gene to detect common genetic variants. This procedure identifies specific changes in the thrombopoietin receptor gene. |
26 | $147 | $602 |
| Molecular pathology test interpretation A physician reviews and interprets the results of a molecular pathology test to provide a diagnostic report. |
26 | $42 | $188 |
| Rheumatoid factor level | 22 | $6 | $30 |
| Thyroxine (T4) level test A blood test that measures the total amount of thyroxine, a thyroid hormone, in your body. |
21 | $7 | $35 |
| Intravenous hydration infusion, 31-60 minutes Administration of fluids into a vein to maintain hydration. This procedure involves an infusion lasting between 31 and 60 minutes. |
18 | $32 | $200 |
| HIV-1 antigen and HIV-1/2 antibody test A laboratory test using immunoassay techniques to detect HIV-1 antigens and antibodies for both HIV-1 and HIV-2. |
15 | $24 | $96 |
| Parathyroid hormone level test A blood test that measures the amount of parathyroid hormone in your body. This hormone helps regulate calcium levels in the blood and bones. |
14 | $40 | $150 |
| Normal saline infusion, 250 cc Administration of 250 cubic centimeters of normal saline solution into a vein. This procedure involves the intravenous delivery of a sterile saltwater fluid. |
14 | $1 | $20 |
| Normal saline infusion, 500 ml Administration of sterile normal saline solution through an intravenous line. This procedure involves the infusion of a 500 ml unit of the solution. |
13 | $1 | $10 |
| Homocysteine level test A blood test that measures the amount of homocysteine, an amino acid, in the body. |
11 | $18 | $50 |
| Flu vaccine administration This procedure involves the administration of the influenza virus vaccine. It covers the process of delivering the vaccine to the patient. |
11 | $36 | $40 |
How to read this data: This reflects Medicare patients only (typically 65+). Payment amounts are what Medicare paid the provider, not your out-of-pocket cost. A higher procedure volume generally indicates more experience with that procedure.
51.9% high complexity
21.7% medium
26.4% routine
Industry Payment Transparency
Open Payments through 2024 ↗$2,738
Total received (2018-2024)
Avg $456/year across 6 years
Top 43% in NY for hematology & oncology
A higher payment rank reflects disclosed industry relationships (consulting, research, speaking) common among subspecialists — not wrongdoing.
39
Companies
129
Individual payments
All payments are legal and publicly reported · Not evidence of wrongdoing · How to interpret →
Payment profile
Industry payments classified by relationship type. Not all payments are equal — research and consulting reflect different relationships than speaking programs or meals.
Meals & Travel
Food, beverages, travel, and lodging — typically low-value
$2,490 (90.9%)
Speaking / Promotional
Speaker programs, honoraria, and industry-sponsored educational events
$248 (9.1%)
Payment trend by year
Annual totals from pharmaceutical and medical device companies.
2024
$17
2023
$465
2021
$497
2020
$577
2019
$897
2018
$286
Payments by company (2024)
Consulting
Speaking
Meals & Travel
Research
Agios Pharmaceuticals, Inc.
$17
Top 3 companies account for 100.0% of 2024 payments
All-time payments by company (2018-2024) ›
AstraZeneca Pharmaceuticals LP
$424
Kite Pharma, Inc.
$236
Novartis Pharmaceuticals Corporation
$183
Gilead Sciences, Inc.
$172
Alexion Pharmaceuticals, Inc.
$143
Janssen Biotech, Inc.
$142
Rigel Pharmaceuticals, Inc.
$136
E.R. Squibb & Sons, L.L.C.
$119
Merck Sharp & Dohme Corporation
$111
Takeda Pharmaceuticals U.S.A., Inc.
$111
Incyte Corporation
$80
Lilly USA, LLC
$73
Janssen Pharmaceuticals, Inc
$70
Genentech USA, Inc.
$57
Astellas Pharma US Inc
$56
PFIZER INC.
$54
GENZYME CORPORATION
$46
TerSera Therapeutics LLC
$45
Ipsen Biopharmaceuticals, Inc
$45
Amgen Inc.
$44
Bayer HealthCare Pharmaceuticals Inc.
$38
ADC Therapeutics America, Inc.
$29
Lexicon Pharmaceuticals, Inc.
$23
Puma Biotechnology, Inc.
$23
Seagen Inc.
$22
Teva Pharmaceuticals USA, Inc.
$22
SUN PHARMACEUTICAL INDUSTRIES INC.
$21
Myovant Sciences Inc.
$20
Celgene Corporation
$20
SANOFI PASTEUR INC.
$20
Array BioPharma Inc.
$19
AbbVie Inc.
$19
GlaxoSmithKline, LLC.
$18
Kyowa Kirin, Inc.
$18
Stemline Therapeutics Inc.
$17
Seattle Genetics, Inc.
$17
Agios Pharmaceuticals, Inc.
$17
Advanced Accelerator Applications
$16
Partner Therapeutics, Inc.
$12
Top 3 companies account for 30.8% of all-time payments
Associated products mentioned in payments ›
ADCETRIS · ALIMTA · BENDEKA · BLENREP · BRAFTOVI · Braftovi · CABLIVI · CREON · CYRAMZA · DARZALEX · ELZONRIS · EMPLICITI · ERLEADA · EVENITY · FLUZONE QUADRIVALENT · IBRANCE · IMBRUVICA · IMFINZI · JAKAFI · KEYTRUDA · KISQALI · LIBTAYO · LUTATHERA · Leukine · MEKINIST · NINLARO · OPDIVO · ORGOVYX · PADCEV · PIQRAY · POTELIGEO · PYRUKYND · Padcev · Perjeta · Revlimid · Rezlidhia · SANDOSTATIN LAR · SOLIRIS · Somatuline Depot · TAGRISSO · TASIGNA · TECENTRIQ · Tavalisse · Trodelvy · ULTOMIRIS · VERZENIO · VOTRIENT · Vectibix · XARELTO · Xermelo · Xofigo · YONSA · Yescarta · Zoladex
Should you be concerned? Payments from pharmaceutical and device companies are legal and common — 57% of U.S. physicians receive at least one. They often reflect legitimate consulting, research, or education. What matters is whether a recommended drug or device appears in your doctor's payment records. If so, consider asking your doctor about it. How to interpret this data →
Most payments (91%) are for meals and travel — low-value interactions that are common across virtually all practicing physicians.
Geographic Context
Hematology & oncology specialists within 10 mi
743
Per 100K population
45.6
County median income
$104,553
Nearest hospital
LENOX HILL HOSPITAL
0.3 mi
0.3 mi
Data Sources
| Provider Registry | ✓ NPPES | Weekly updates |
| Medicare Enrollment | ✓ PECOS | Monthly updates |
| Practice Data | ✓ Medicare Util. | Annual (CY lag) |
| Industry Payments | ✓ Open Payments | CY 2024 |
| Disciplinary History | — Not public | N/A |
This provider has data in 4 of 4 available federal datasets, with a Data Coverage level of Very High. This reflects how much public data is available about a provider. How we calculate this →
Summary
Dr. Gruenstein is a mixed practice specialist, with above-average Medicare volume (top 4% in NY), with low-engagement industry engagement, with 20 years of NPI registration.
This summary is auto-generated from federal data, describing data availability and patterns. Read our methodology →
Frequently Asked Questions
Is Dr. Gruenstein experienced with iron infusion (injectafer)?
Based on Medicare claims data, Dr. Gruenstein performed 80,250 iron infusion (injectafer) services. Research suggests that higher procedure volume is often associated with better outcomes, particularly for complex procedures. Note that Medicare data only captures patients aged 65 and older, so the total practice volume across all patients is likely higher.
Does Dr. Gruenstein receive payments from pharmaceutical companies?
Yes. Dr. Gruenstein received a total of $2,738 from 39 companies across 129 individual payments. These payments are legal, publicly disclosed under the federal Sunshine Act, and common among physicians — 57% of all U.S. physicians receive at least one industry payment. Patients may wish to ask their doctor about these relationships, especially if a recommended drug or device appears in the payment records.
How do Dr. Gruenstein's costs compare to other hematology & oncology specialists in New York?
Dr. Gruenstein's average Medicare payment per service is $8. Note that these figures represent what Medicare pays, not your out-of-pocket cost, which depends on your specific insurance plan and deductible. Procedure-level data above shows both what was submitted and what Medicare paid for each service type.
What does Data Coverage mean?
Data Coverage (currently Very High for Dr. Gruenstein) measures how much public federal data is available about a provider. It is not a quality rating. A "Very High" or "High" level means the provider has data across multiple federal sources (NPPES, PECOS, Medicare Utilization, Open Payments), indicating a long track record of practice, Medicare participation, and industry disclosure. A "Low" or "Moderate" level may simply mean the provider is newer, does not see Medicare patients, or has not received any industry payments — none of which are inherently negative. Read our full methodology →
Is this data up to date?
Each data source has its own update cycle. Provider registry data (NPPES) is updated weekly. Medicare enrollment (PECOS) is updated monthly. Medicare practice data has a ~2 year lag — the most recent available is typically 2 years prior. Industry payment data (Open Payments) is published annually, usually in June, covering the prior calendar year. We display the data date prominently on each section so you always know how current it is. See our data freshness policy →
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About this page
All data on this page is sourced verbatim from public federal records published by the U.S. Centers for Medicare & Medicaid Services (CMS): NPPES ↗, Open Payments ↗, Medicare Provider Utilization ↗, and PECOS. Publication is mandated by the Physician Payments Sunshine Act (§6002 ACA, 42 U.S.C. §1320a-7h) and the Freedom of Information Act.
This page is not medical advice, an endorsement, a recommendation, or a quality rating. Data Coverage reflects data completeness — how much federal information exists for this provider — not clinical performance, patient outcomes, or quality of care. Always verify information directly with the provider and consult a licensed clinician before making medical decisions.
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