OrganizationActive
William Markey Md,sc
NPI 1265667158 · Gastroenterology Physician · Chicago, IL
Provider details
- NPI number
- 1265667158
- Entity type
- Organization
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Organization subpart
- No
- Authorized official
- Willaim Markey, President(312) 944-2188
- License
- 036046023 (IL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
Detailed profile(85/100 index)
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
17 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
3000 N Halsted St Ste 506
Chicago, IL 60657-5194
Phone: (312) 944-2188
Street-level locationGet directions
Mailing address
Po Box 146530
Chicago, IL 60614-6400
Registry dates
- Enumerated
- 2009-05-20
- Last updated
- 2009-05-20
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.