Lake County Internal Medicine Associates, LLC
NPI 1154686525 · Internal Medicine Physician · Long Grove, IL
Enrolled with Medicare as Part B Supplier - Clinic/Group Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Lake County Internal Medicine Associates, LLC is a Internal Medicine Physician organization in Long Grove, IL (NPI 1154686525).
Provider details
- NPI number
- 1154686525
- Entity type
- Organization
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Organization subpart
- No
- Authorized official
- Mariusz Milejczyk, President(847) 478-5108
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
13 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
- 2012-07-11
- Last updated
- 2012-07-11
Frequently asked questions
- What is Lake County Internal Medicine Associates, LLC's NPI number?
- Lake County Internal Medicine Associates, LLC's National Provider Identifier (NPI) is 1154686525, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What type of organization is Lake County Internal Medicine Associates, LLC?
- Lake County Internal Medicine Associates, LLC is classified in the NPPES registry as Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Lake County Internal Medicine Associates, LLC located?
- Lake County Internal Medicine Associates, LLC's practice location on file with NPPES is 5911 Kildeer Ct, Long Grove, IL 60047-5052.
- What is Lake County Internal Medicine Associates, LLC's phone number?
- The practice phone number listed in the NPPES registry for Lake County Internal Medicine Associates, LLC is (847) 478-5108.
- Does Lake County Internal Medicine Associates, LLC accept Medicare?
- Lake County Internal Medicine Associates, LLC 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 Lake County Internal Medicine Associates, LLC?
- The authorized official listed on Lake County Internal Medicine Associates, LLC's NPPES record is Mariusz Milejczyk, President. The authorized official registers and maintains the organization's NPI and is not necessarily its owner.
- Is Lake County Internal Medicine Associates, LLC's NPI active?
- Yes — Lake County Internal Medicine Associates, LLC's NPI (1154686525) is active in the NPPES registry as of the last update on 2012-07-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.