1. Home
  2. Directory
  3. Illinois
  4. Chicago
  5. Internal Medicine
  6. NPI Profile

WILLIAM SIMON MARKEY MD
NPI 1033204706
Internal Medicine - Gastroenterology in Chicago, IL

Active since October 04, 2006PECOS Enrolled
3000 N HALSTED ST STE 506, CHICAGO, IL 60657(312) 944-1247(312) 944-2188 Get Directions Write a Review

NPPES record last updated: May 18, 2009. Verified against the NPPES registry weekly; last sync: August 02, 2026.

About William Simon Markey Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

WILLIAM SIMON MARKEY MD (NPI 1033204706) is an individual gastroenterology provider in Chicago, Illinois, licensed in Illinois (36046023) and active in the NPI registry since October 2006. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1033204706
Entity TypeIndividualMale
Primary Taxonomy207RG0100X
Provider Legal NameWILLIAM SIMON MARKEYCredential: MD
Location Address3000 N HALSTED ST STE 506Chicago, IL 60657-5194
Mailing AddressPo Box 146530Chicago, IL 60614 · (312) 944-1247 · Fax (312) 944-2188
Phone(312) 944-1247
Fax(312) 944-2188
Sole ProprietorYes
Enumeration DateOctober 4, 2006
Last NPPES UpdateMay 18, 2009
✔ NPI 1033204706 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · GastroenterologyAllopathic & Osteopathic Physicians
Taxonomy Code207RG0100X
License✔ Licensed in IL · 36046023
Definition
An internist who specializes in diagnosis and treatment of diseases of the digestive organs including the stomach, bowels, liver and gallbladder. This specialist treats conditions such as abdominal pain, ulcers, diarrhea, cancer and jaundice and performs complex diagnostic and therapeutic procedures using endoscopes to visualize internal organs.
3000 N HALSTED ST STE 506, Chicago, IL 60657
Open in Google Maps ↗

Other Identifiers 4

Medicaid036046023IL
Other0021607476Bc
Medicare UPINC45070
Medicare ID-Type Unspecified602040

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

William Simon Markey Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 60657 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$138.86 typical visit price
range $60.08 – $183.39
Typical copayment $34.71 (range $15.02 – $45.84)
Most-billed visit code 99204
Established Patient
$105.70 typical visit price
range $18.97 – $148.12
Typical copayment $26.42 (range $4.74 – $37.03)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 2

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

WILLIAM MARKEY MD,SC
Internal Medicine (Gastroenterology)
3000 N HALSTED ST STE 506
CHICAGO, IL 60657
Cook County (312) 944-2188
DAVID MOORE, D.O., S.C.
Internal Medicine
3000 N HALSTED ST STE 506
CHICAGO, IL 60657
Cook County (773) 327-3238

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is William Markey's NPI number?

The NPI number for William Markey is 1033204706. It was assigned to this individual provider in the NPPES registry on October 4, 2006.

Where is William Markey located?

William Markey practices at 3000 N Halsted St Ste 506, Chicago, IL 60657. The listed phone number is (312) 944-1247.

What is William Markey's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.

Is William Markey enrolled in Medicare?

Yes. William Markey is registered in the Medicare PECOS enrollment system.

When was this NPI record last updated?

The NPPES record for William Markey was last updated on May 18, 2009. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 17 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.