Marcus Clark
NPI 1790847242 · Rheumatology Physician · Chicago, IL
Enrolled with Medicare as Practitioner - Rheumatology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Marcus Clark is a Rheumatology Physician provider in Chicago, IL (NPI 1790847242).
Provider details
- NPI number
- 1790847242
- Entity type
- Individual
- Primary specialty
- Rheumatology PhysicianAllopathic & Osteopathic Physicians
- Sex
- Male
- Sole proprietor
- No
- License
- 036087330 (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
- 2006-12-14
- Last updated
- 2022-10-24
Frequently asked questions
- What is Marcus Clark's NPI number?
- Marcus Clark's National Provider Identifier (NPI) is 1790847242, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Marcus Clark's specialty?
- Marcus Clark is listed in the NPPES registry with a primary specialty of Rheumatology Physician (Allopathic & Osteopathic Physicians).
- Where is Marcus Clark located?
- Marcus Clark's practice location on file with NPPES is 5841 S Maryland Ave, Chicago, IL 60637-1443.
- What is Marcus Clark's phone number?
- The practice phone number listed in the NPPES registry for Marcus Clark is (888) 824-0200.
- Does Marcus Clark accept Medicare?
- Marcus Clark is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Marcus Clark's NPI active?
- Yes — Marcus Clark's NPI (1790847242) is active in the NPPES registry as of the last update on 2022-10-24.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.