Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Guillermo Rodriguez Jr., MD

Medical Oncology Physician in Belleville, IL · enumerated 2006.

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

National Provider Identifier

1861440661

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Registry record

Entity type Individual (Type 1)

Name Dr. Guillermo Rodriguez Jr.

Credential MD

Sex Male

Practice address 4500 Memorial Dr, Div Medical Oncology, Belleville, IL, 62226

Phone (800) 647-2098

Fax (314) 362-3192

Enumeration date May 4, 2006

Last updated in NPPES Apr 21, 2025

Taxonomy & licenses

207RX0202X Medical Oncology Physician Allopathic & Osteopathic Physicians · License 036070727 (IL) 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
200058088	Medicaid	MO	-

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 1861440661 active?

Yes, as of the latest NPPES snapshot, NPI 1861440661 is active (record last updated 2025-04-21).

How do I verify Guillermo Rodriguez's NPI record?

Cross-check NPI 1861440661 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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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-04-21.