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David A. Janssen, MD

Infectious Disease Doctor

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Specialties and Licenses

Licensed In
Illinois, Missouri
NPI Number
1700995339
In the National Registry
20 years (since 2006)

Name, specialties, licenses and address come from the NPPES national provider registry, updated weekly (this record last changed October 2025).

What Infectious Disease Doctors Commonly Treat

Typical for the specialty. Ask the office which of these Dr. David Janssen offers.

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Medical Disclaimer

The information on this site is for general educational purposes only and is not medical advice, diagnosis, or treatment. Reading this site does not create a doctor–patient relationship. Always consult a qualified healthcare professional for personal guidance. If this is an emergency, call 911. Mentions of medications, devices, or procedures are informational and not endorsements. Full medical disclaimer.