Mark Jiaras Ltd
NPI 1336502434 · Community/Behavioral Health Agency · Chicago, IL
Enrolled with Medicare as Part B Supplier - Clinic/Group Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Jiaras Ltd is a Community/Behavioral Health Agency organization in Chicago, IL (NPI 1336502434).
Provider details
- NPI number
- 1336502434
- Entity type
- Organization
- Primary specialty
- Community/Behavioral Health AgencyAgencies
- Organization subpart
- No
- Authorized official
- Mark Jiaras, President(847) 630-3900
- License
- 071-006111 (IL)
Specialties & taxonomies
Agencies
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
10 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
- 2016-04-05
- Last updated
- 2016-04-05
Frequently asked questions
- What is Mark Jiaras Ltd's NPI number?
- Mark Jiaras Ltd's National Provider Identifier (NPI) is 1336502434, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What type of organization is Mark Jiaras Ltd?
- Mark Jiaras Ltd is classified in the NPPES registry as Community/Behavioral Health Agency (Agencies).
- Where is Mark Jiaras Ltd located?
- Mark Jiaras Ltd's practice location on file with NPPES is 4200 W Peterson Ave, Chicago, IL 60646-6074.
- What is Mark Jiaras Ltd's phone number?
- The practice phone number listed in the NPPES registry for Mark Jiaras Ltd is (847) 630-3900.
- Does Mark Jiaras Ltd accept Medicare?
- Mark Jiaras 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 Mark Jiaras Ltd?
- The authorized official listed on Mark Jiaras Ltd's NPPES record is Mark Jiaras, President. The authorized official registers and maintains the organization's NPI and is not necessarily its owner.
- Is Mark Jiaras Ltd's NPI active?
- Yes — Mark Jiaras Ltd's NPI (1336502434) is active in the NPPES registry as of the last update on 2016-04-05.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.