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

Mark Chien MD LLC

Organization Internal Medicine Physician · NPI 1790890598

Mark Chien MD LLC is an Internal Medicine Physician in Chicago, Illinois. Licensed in Illinois. Registered with an NPI since 2006.

Licensed in
IL
In the registry since
2006
What do these letters mean?
LLC — Limited liability company
A form of business registration, not a clinical qualification.

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Practice location Address checks out

680 N Lake Shore Dr Ste 118
Chicago, IL 60611-4546
Phone: (312) 503-6000
Fax: (312) 503-6329
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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 (IL)

Record details

NPI number1790890598
Entity typeOrganization (Type 2)
Organization subpartNo
Authorized official Mark Chien — President · (312) 503-6000
NPI enumeratedAugust 20, 2006
Last updated in NPPESNovember 14, 2007
Mailing address680 N Lake Shore Dr, Suite 118, Chicago, IL 60611-4546

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