Karl Sonntag MD
About this NPIWhat this record shows.
NPI 1164029146 is registered to Karl Sonntag MD, a Internal Medicine practising at 6420 Clayton Rd in Saint Louis, Missouri. Internal Medicine physicians (internists) specialise in the prevention, diagnosis, and treatment of diseases in adults, often coordinating care across multiple subspecialties. Karl Sonntag MD has been enumerated in the National Provider Identifier (NPI) registry since 2020.
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Insurance & acceptsHow to confirm coverage.
The National Plan and Provider Enumeration System (NPPES) registry does not include commercial insurance network data, so we cannot show which plans Karl Sonntag MD accepts. To confirm in-network status with your specific health plan, contact Karl Sonntag MD directly at (314) 768-8373.
Frequently asked
Yes. NPI 1164029146 is registered as Active in the CMS NPPES public registry and passes the Luhn check-digit validation that all 10-digit NPIs use.
Internal Medicine physicians (internists) specialise in the prevention, diagnosis, and treatment of diseases in adults, often coordinating care across multiple subspecialties.
The CMS NPPES Public Registry at npiregistry.cms.hhs.gov is the authoritative source. FindMyNPI mirrors this dataset and refreshes monthly. For real-time verification, you can also call the provider's office at (314) 768-8373.
An individual healthcare provider has a single Type-1 NPI for life. Organisations can hold separate Type-2 NPIs per location, specialty, or sub-entity. Karl Sonntag MD is a Type-1 individual NPI.