Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. John Niedzwicki, M.D.

Medical Oncology Physician in Dartmouth, MA · enumerated 2006.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1306812367

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Registry record

Entity type Individual (Type 1)

Name Dr. John Niedzwicki

Credential M.D.

Sex Male

Practice address 535 Faunce Corner Rd, Dartmouth, MA, 02747

Phone (508) 996-3991

Enumeration date Feb 28, 2006

Last updated in NPPES Apr 24, 2023

Taxonomy & licenses

207RX0202X Medical Oncology Physician Allopathic & Osteopathic Physicians · License 74834 (MA) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier	Type	State	Issuer
3091112	Medicaid	MA	-

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

Is NPI 1306812367 active?

Yes, as of the latest NPPES snapshot, NPI 1306812367 is active (record last updated 2023-04-24).

How do I verify John Niedzwicki's NPI record?

Cross-check NPI 1306812367 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Robert Conroy Sleep Medicine (Psychiatry & Neurology) Physician · Dartmouth, MA NPI 1528062858 Juan Cuebas Neurology Physician · Dartmouth, MA NPI 1679578256 Robert Audycki Corneal and Contact Management Optometrist · N Dartmouth, MA NPI 1689673428 Luiza Arbain Pharmacist · Dartmouth, MA NPI 1245232099 Justin Matrisciano Endocrinology, Diabetes & Metabolism Physician · Dartmouth, MA NPI 1922093210 Alvin Marcovici Neurological Surgery Physician · North Dartmouth, MA NPI 1376530337 Paul Vivino Interventional Cardiology Physician · North Dartmouth, MA NPI 1295717387 Sherry Audycki Optometrist · N Dartmouth, MA NPI 1679559108

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-04-24.