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

Nithin Karnan, MD

Individual provider Internal Medicine Physician · NPI 1639069099

Nithin Karnan, MD is an Internal Medicine Physician in Mason City, Iowa. Licensed in Iowa. Registered with an NPI since 2025.

Licensed in
IA
In the registry since
2025
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

1010 4th St SW Ste 305
Mason City, IA 50401-2856
Phone: (641) 428-5700
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence R-13421 (IA)

Record details

NPI number1639069099
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJuly 8, 2025
Last updated in NPPESJuly 8, 2025
Certification dateJuly 8, 2025
Mailing address1010 4th St Sw, Suite 305, Mason City, IA 50401-2856

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