Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Ms. Claire M Vargo, FNP
Nurse Practitioner in O Fallon, IL · enumerated 2020.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1831712835
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Registry record
Entity type Individual (Type 1)
Name Ms. Claire M Vargo
Credential FNP
Sex Female
Practice address 3 Saint Elizabeth Blvd Ste 1800, O Fallon, IL, 62269
Phone (618) 233-6044
Fax (618) 233-5195
Enumeration date May 26, 2020
Last updated in NPPES Feb 4, 2026
Taxonomy & licenses
363L00000X Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 209019577 (IL) Primary
363LF0000X Family Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 209019577 (IL) Secondary
FNP · Family Nurse Practitioner: A nurse practitioner certified in family practice across the lifespan.
About the FNP credential
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 420105608 | 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.
Frequently asked questions
Is NPI 1831712835 active?
Yes, as of the latest NPPES snapshot, NPI 1831712835 is active (record last updated 2026-02-04).
How do I verify Claire Vargo's NPI record?
Cross-check NPI 1831712835 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Other providers at this practice address
Browse all → Muhammad Sheikh Interventional Cardiology Physician · O Fallon, IL NPI 1194107524 Hasan Rehman Interventional Cardiology Physician · O Fallon, IL NPI 1386028124 Chelsea Bell Family Nurse Practitioner · O Fallon, IL NPI 1407230188 Summit Pandat Clinical Cardiac Electrophysiology Physician · O Fallon, IL NPI 1922454099 Sydney Pollmann Family Nurse Practitioner · O Fallon, IL NPI 1245032507 Rece Portell Physician Assistant · O Fallon, IL NPI 1841081379
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-02-04.