OrganizationActive
Mark Chien MD LLC
NPI 1790890598 · Internal Medicine Physician · Chicago, IL
Mark Chien MD LLC is a Internal Medicine Physician organization in Chicago, IL (NPI 1790890598).
Provider details
- NPI number
- 1790890598
- Entity type
- Organization
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Organization subpart
- No
- Authorized official
- Mark Chien, President(312) 503-6000
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
Detailed profile(90/100 index)
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
680 N Lake Shore Dr
Suite 118
Chicago, IL 60611-4546
Phone: (312) 503-6000
Fax: (312) 503-6329
Street-level locationGet directions
Mailing address
680 N Lake Shore Dr
Chicago, IL 60611-4546
Registry dates
- Enumerated
- 2006-08-20
- Last updated
- 2007-11-14
Frequently asked questions
- What is Mark Chien MD LLC's NPI number?
- Mark Chien MD LLC's National Provider Identifier (NPI) is 1790890598, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What type of organization is Mark Chien MD LLC?
- Mark Chien MD LLC is classified in the NPPES registry as Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Chien MD LLC located?
- Mark Chien MD LLC's practice location on file with NPPES is 680 N Lake Shore Dr, Chicago, IL 60611-4546.
- What is Mark Chien MD LLC's phone number?
- The practice phone number listed in the NPPES registry for Mark Chien MD LLC is (312) 503-6000.
- Who is the authorized official for Mark Chien MD LLC?
- The authorized official listed on Mark Chien MD LLC's NPPES record is Mark Chien, President. The authorized official registers and maintains the organization's NPI and is not necessarily its owner.
- Is Mark Chien MD LLC's NPI active?
- Yes — Mark Chien MD LLC's NPI (1790890598) is active in the NPPES registry as of the last update on 2007-11-14.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.