John Niedzwicki, M.D.
NPI 1306812367 · Medical Oncology Physician · Dartmouth, MA
Enrolled with Medicare as Practitioner - Hematology/Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John Niedzwicki, M.D. is a Medical Oncology Physician provider in Dartmouth, MA (NPI 1306812367).
Provider details
- NPI number
- 1306812367
- Entity type
- Individual
- Primary specialty
- Medical Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 74834 (MA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
3,645 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Infusion Into a Vein for Therapy, Prevention, Or Diagnosis, 1 Hour Or Less96365 | 824 | $64 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 471 | $91 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 421 | $9 |
| Complete Blood Cell Count (red Cells, White Blood Cell, Platelets), Automated Test and Automated Differential White Blood Cell Count85025 | 398 | $8 |
| Injection of Drug Or Substance Under Skin Or Into Muscle96372 | 300 | $15 |
| Ferritin (blood Protein) Level82728 | 289 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 15 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Hydroxyurea | 143 | 24 |
| Tamoxifen Citrate | 60 | 16 |
| Raloxifene Hcl | 55 | 16 |
| Anastrozole | 51 | 14 |
| Letrozole | 41 | 11 |
| Ibrutinibbrand: Imbruvica | 34 | — |
| Anagrelide Hcl | 17 | — |
| Levothyroxine Sodium | 15 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$42 across 2 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Additional practice locations (1)
- 535 Faunce Corner RoadNorth Dartmouth, MA 02747-3713Phone: (508) 961-0710
Registry dates
- Enumerated
- 2006-02-28
- Last updated
- 2023-04-24
- Certified
- 2023-04-24
Frequently asked questions
- What is John Niedzwicki's NPI number?
- John Niedzwicki's National Provider Identifier (NPI) is 1306812367, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Niedzwicki's specialty?
- John Niedzwicki is listed in the NPPES registry with a primary specialty of Medical Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is John Niedzwicki located?
- John Niedzwicki's practice location on file with NPPES is 535 Faunce Corner Rd, Dartmouth, MA 02747-1242.
- What is John Niedzwicki's phone number?
- The practice phone number listed in the NPPES registry for John Niedzwicki is (508) 996-3991.
- Does John Niedzwicki accept Medicare?
- John Niedzwicki is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is John Niedzwicki's NPI active?
- Yes — John Niedzwicki's NPI (1306812367) is active in the NPPES registry as of the last update on 2023-04-24.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.