Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

Karl Christian Sonntag, MD

Individual provider Internal Medicine Physician · NPI 1164029146

Karl Christian Sonntag, MD is an Internal Medicine Physician in Saint Louis, Missouri. Licensed in Missouri. Registered with an NPI since 2020.

Licensed in
MO
In the registry since
2020
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Practice location Address checks out

6420 Clayton Rd
Saint Louis, MO 63117-1811
Phone: (314) 768-8373
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 2023047698 (MO)

Record details

NPI number1164029146
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedOctober 3, 2020
Last updated in NPPESJune 2, 2026
Certification dateJune 2, 2026

Other providers in Saint Louis