Steven Marek, M.D.
NPI 1588953897 · Hospitalist Physician · Oak Lawn, IL
Enrolled with Medicare as Practitioner - Pediatric Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Steven Marek, M.D. is a Hospitalist Physician provider in Oak Lawn, IL (NPI 1588953897).
Provider details
- NPI number
- 1588953897
- Entity type
- Individual
- Primary specialty
- Hospitalist PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 0101256140 (VA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
15 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
2 documented practice locations
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
Additional practice locations (1)
- 111 Michigan Ave NwSuite M-4800Washington, DC 20010-2916Phone: (217) 390-4950
Registry dates
- Enumerated
- 2011-04-07
- Last updated
- 2026-01-22
- Certified
- 2026-01-22
Frequently asked questions
- What is Steven Marek's NPI number?
- Steven Marek's National Provider Identifier (NPI) is 1588953897, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Steven Marek's specialty?
- Steven Marek is listed in the NPPES registry with a primary specialty of Hospitalist Physician (Allopathic & Osteopathic Physicians).
- Where is Steven Marek located?
- Steven Marek's practice location on file with NPPES is 4440 W 95th St Ste 2177h, Oak Lawn, IL 60453-2600.
- What is Steven Marek's phone number?
- The practice phone number listed in the NPPES registry for Steven Marek is (847) 723-5577.
- Does Steven Marek accept Medicare?
- Steven Marek is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Steven Marek's NPI active?
- Yes — Steven Marek's NPI (1588953897) is active in the NPPES registry as of the last update on 2026-01-22.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.