Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Diane Sonntag, DT
Specialist in Indianapolis, IN · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1679640742
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Registry record
Entity type Individual (Type 1)
Name Diane Sonntag
Credential DT
Sex Female
Practice address 8820 Anchor Bay Ct, Indianapolis, IN, 46236
Phone (317) 826-1853
Fax (317) 826-1938
Enumeration date Nov 30, 2006
Last updated in NPPES Jul 9, 2007
Taxonomy & licenses
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
How do I verify Diane Sonntag's NPI record?
Cross-check NPI 1679640742 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Is NPI 1679640742 active?
Yes, as of the latest NPPES snapshot, NPI 1679640742 is active (record last updated 2007-07-09).
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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-09.