William Markey, MD
NPI 1033204706 · Gastroenterology Physician · Chicago, IL
Enrolled with Medicare as Order and Referring Only - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Markey, MD is a Gastroenterology Physician provider in Chicago, IL (NPI 1033204706).
Provider details
- NPI number
- 1033204706
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
- License
- 36046023 (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
- 2006-10-04
- Last updated
- 2009-05-18
Frequently asked questions
- What is William Markey's NPI number?
- William Markey's National Provider Identifier (NPI) is 1033204706, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Markey's specialty?
- William Markey is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is William Markey located?
- William Markey's practice location on file with NPPES is 3000 N Halsted St Ste 506, Chicago, IL 60657-5194.
- What is William Markey's phone number?
- The practice phone number listed in the NPPES registry for William Markey is (312) 944-1247.
- Does William Markey accept Medicare?
- William Markey is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Markey's NPI active?
- Yes — William Markey's NPI (1033204706) is active in the NPPES registry as of the last update on 2009-05-18.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.