NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Robert C. Witkowski, M.D.

Surgery Physician in Barrington, IL · enumerated 2007.

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

National Provider Identifier

1366575664

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)
Name Dr. Robert C. Witkowski
Credential M.D.
Sex Male
Practice address 27750 W Il Route 22, Suite 130, Barrington, IL, 60010
Phone (847) 381-6051
Fax (847) 381-6084
Enumeration date Mar 14, 2007
Last updated in NPPES Apr 8, 2008

Taxonomy & licenses

208600000X Surgery Physician Allopathic & Osteopathic Physicians 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 Robert Witkowski's NPI record?
Cross-check NPI 1366575664 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Is NPI 1366575664 active?
Yes, as of the latest NPPES snapshot, NPI 1366575664 is active (record last updated 2008-04-08).

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-04-08.