Illinois Internal Medicine Ltd
NPI 1659597730 · Internal Medicine Physician · Libertyville, IL
Enrolled with Medicare as Part B Supplier - Clinic/Group Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Illinois Internal Medicine Ltd is a Internal Medicine Physician organization in Libertyville, IL (NPI 1659597730).
Provider details
- NPI number
- 1659597730
- Entity type
- Organization
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Organization subpart
- No
- Authorized official
- Mark Chyna, President(847) 367-3060
- License
- 042-617825 (IL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
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
Mailing address
Registry dates
- Enumerated
- 2007-04-17
- Last updated
- 2008-12-14
Frequently asked questions
- What is Illinois Internal Medicine Ltd's NPI number?
- Illinois Internal Medicine Ltd's National Provider Identifier (NPI) is 1659597730, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What type of organization is Illinois Internal Medicine Ltd?
- Illinois Internal Medicine Ltd is classified in the NPPES registry as Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Illinois Internal Medicine Ltd located?
- Illinois Internal Medicine Ltd's practice location on file with NPPES is 890 Garfield Ave, Libertyville, IL 60048-4723.
- What is Illinois Internal Medicine Ltd's phone number?
- The practice phone number listed in the NPPES registry for Illinois Internal Medicine Ltd is (847) 367-3843.
- Does Illinois Internal Medicine Ltd accept Medicare?
- Illinois Internal Medicine Ltd is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Who is the authorized official for Illinois Internal Medicine Ltd?
- The authorized official listed on Illinois Internal Medicine Ltd's NPPES record is Mark Chyna, President. The authorized official registers and maintains the organization's NPI and is not necessarily its owner.
- Is Illinois Internal Medicine Ltd's NPI active?
- Yes — Illinois Internal Medicine Ltd's NPI (1659597730) is active in the NPPES registry as of the last update on 2008-12-14.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.