Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Dr. Janusz J Madej, M.D.

Internal Medicine Physician in Los Altos, CA · enumerated 2006.

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

National Provider Identifier

1376616706

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name Dr. Janusz J Madej

Credential M.D.

Sex Male

Practice address Los Altos, CA, 94022

Phone (650) 529-1669

Fax (650) 529-1670

Enumeration date Nov 15, 2006

Last updated in NPPES Mar 30, 2024

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License A69531 (CA) Primary

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

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

How do I verify Janusz Madej's NPI record?

Cross-check NPI 1376616706 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1376616706 active?

Yes, as of the latest NPPES snapshot, NPI 1376616706 is active (record last updated 2024-03-30).

Other providers at this practice address

Browse all →

Jessica Madej Internal Medicine Physician · Los Altos, CA NPI 1417537218

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-03-30.