Dr. John Niedzwicki, M.D.
What this data tells you about Dr. Niedzwicki
Dr. John Niedzwicki is a medical oncology specialist in Dartmouth, MA, with 20 years of NPI registration. Based on federal Medicare data, Dr. Niedzwicki performed 202,113 Medicare services across 3,415 unique beneficiaries.
Between the years covered by Open Payments, Dr. Niedzwicki received a total of $343 from 5 pharmaceutical and/or device companies across 7 individual payments. These payments are legal, publicly disclosed under the federal Sunshine Act, and common in medical oncology. The majority of payments are for speaking programs and promotional activities, reflecting participation in industry-sponsored events. Patients may wish to discuss these relationships with their provider.
The Data Coverage level for Dr. Niedzwicki 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.
Medicare Practice Summary
Medicare Utilization ↗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 sucrose injection (Venofer) An injection of iron sucrose used to replenish iron levels in the body. |
172,000 | $0 | $2 |
| Epoetin alfa injection (Procrit) for anemia An injection of epoetin alfa containing 1000 units for use in patients not on end-stage renal disease (ESRD) dialysis. |
10,240 | $6 | $28 |
| Epoetin alfa injection (Retacrit) for anemia An injection of a biosimilar form of epoetin alfa used for non-end-stage renal disease purposes. The dose administered is 1000 units. |
8,920 | $6 | $22 |
| Infliximab-dyyb biosimilar injection, 10 mg An injection of infliximab-dyyb, a biosimilar medication, administered in a 10 mg dose. |
3,120 | $15 | $123 |
| Blood draw (venipuncture) Insertion of a needle into a vein to collect a blood sample. |
1,363 | $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. |
1,230 | $8 | $25 |
| 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. |
898 | $52 | $251 |
| Ferritin level test (iron stores) A blood test that measures the level of ferritin, a protein that stores iron in the body. |
833 | $13 | $40 |
| 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. |
550 | $65 | $224 |
| 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. |
520 | $11 | $67 |
| Iron level test | 430 | $6 | $20 |
| 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. |
430 | $8 | $26 |
| 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. |
316 | $92 | $334 |
| Liver function blood test panel | 184 | $8 | $40 |
| Complete blood count (CBC), automated An automated laboratory test that measures the levels of red blood cells, white blood cells, and platelets in the blood. |
149 | $6 | $20 |
| 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. |
148 | $0 | $8 |
| Manual white blood cell count A laboratory test that involves examining a sample under a microscope to manually count the number of white blood cells present. |
121 | $4 | $20 |
| Vitamin B-12 level test A blood test that measures the amount of vitamin B-12 in your body. |
110 | $14 | $49 |
| Additional hour of intravenous chemotherapy This code represents the administration of chemotherapy medication into a vein for each additional hour beyond the initial period. |
99 | $21 | $112 |
| Intravenous chemotherapy infusion, 1 hour or less Administration of chemotherapy medication directly into a vein. The procedure takes one hour or less to complete. |
92 | $100 | $534 |
| Comprehensive metabolic blood panel A blood test that measures a group of chemicals, including glucose, electrolytes, and kidney and liver function markers. |
66 | $10 | $40 |
| 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. |
59 | $122 | $509 |
| 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. |
51 | $137 | $448 |
| Sed rate test (inflammation marker) This automated test measures how quickly red blood cells settle in a tube to detect inflammation in the body. |
43 | $3 | $40 |
| Automated red blood cell count An automated laboratory test that measures the number of red blood cells in a blood sample. |
32 | $4 | $20 |
| Blood creatinine level test A blood test that measures the amount of creatinine, a waste product from muscle wear and tear, to help assess kidney function. |
29 | $5 | $20 |
| Electrolyte blood test panel A blood test that measures the levels of sodium, potassium, chloride, and carbon dioxide to evaluate electrolyte balance. |
26 | $7 | $26 |
| Blood urea nitrogen test A blood test that measures the amount of urea nitrogen to assess kidney function. |
23 | $4 | $20 |
| New patient office visit (30-44 min) An initial office visit for a new patient lasting between 30 and 44 minutes. This code is used when the total time spent on the date of the encounter falls within this range. |
20 | $83 | $333 |
| Folic acid level test A blood test that measures the amount of folic acid in the serum. |
11 | $14 | $45 |
Industry Payment Transparency
Open Payments through 2024 ↗Payment profile
Industry payments classified by relationship type. Not all payments are equal — research and consulting reflect different relationships than speaking programs or meals.
Payment trend by year
Annual totals from pharmaceutical and medical device companies.
Payments by company (2024)
All-time payments by company (2018-2024) ›
Associated products mentioned in payments ›
The majority of payments (83%) are for speaking programs and promotional activities, which reflect participation in industry-sponsored educational or marketing events. This is common in medical oncology and does not inherently indicate bias, but patients may wish to be aware.
Geographic Context
0.0 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. Niedzwicki is a mixed practice specialist, with above-average Medicare volume (top 1% in MA), with speaking/promotional 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
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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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