Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Ann T Warren, MD
Specialist in Barrington, IL · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1902993603
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Registry record
Entity type Individual (Type 1)
Name Ann T Warren
Credential MD
Sex Female
Practice address 27790 W Il Route 22 Ste 32, Barrington, IL, 60010
Phone (847) 381-8181
Fax (847) 381-0604
Enumeration date Oct 6, 2006
Last updated in NPPES Oct 20, 2011
Taxonomy & licenses
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 |
|---|---|---|---|
| 036075414 | Medicaid | IL | - |
| 04915108 | Other | IL | BLUECROSS/BLUESHIELD |
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
Where does Ann Warren practice?
The practice location on file with NPPES is in Barrington, IL. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for Ann Warren?
The National Provider Identifier (NPI) for Ann Warren is 1902993603, a Type 1 (individual) record in the CMS NPPES registry.
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-10-20.