NPPES file of Aug 9, 2026

Specialist in Illinois

1,154 NPPES records list specialist with a practice address in Illinois, 9 per 100,000 residents, the 35th highest rate of 51. Chicago and Evanston have the most; each record links to the provider's NPI and the Illinois license search. Page 24 of 24.

CMS NPPES registry, file of Aug 9, 2026; 2023 Census estimates · NUCC 174400000X · method

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

Chicago has the most, 231

  1. Chicago231
  2. Evanston36
  3. Rockford21
  4. Freeport20
  5. Naperville20

Specialist records in Illinois

  1. Melissa Zizzo, D.T.Gurnee, IL 600311477845907
  2. Aras Zlioba, M.D.Joliet, IL 604351548223233
  3. Jack Zoldan, M.D.Chicago, IL 606401770544629
  4. Alan Zucker, M.D.Lombard, IL 601481881696623

Source: CMS NPPES, primary taxonomy 174400000X: records by practice city and the list of records, file of Aug 9, 2026.

Illinois ranks 35 of 51 per resident

  1. Wyoming9
  2. Nebraska9
  3. Virginia9
  4. Illinois9
  5. Idaho9
  6. Vermont9
  7. 50 states and D.C.18

Source: CMS NPPES, primary taxonomy 174400000X by practice state, file of Aug 9, 2026; records per 100,000 residents, 2023 Census estimates.

19.1% of these records appear in a Medicare file, against 17.0% nationally

A Medicare file here is Part D prescribing (2024), a MIPS score (2023), an Open Payments record (2024) or Medicare group billing (CMS Doctors and Clinicians). A record outside them may still see patients: these files cover Medicare only.

  1. Illinois19.1%
  2. United States17.0%

Specialist records in Illinois, measured

  • In a Medicare file220 of 1,154 · 19.1% here, 17.0% nationally
  • In the CMS Doctors and Clinicians file127 · 11.0% here, 11.1% nationally
  • Not updated in five years or more968 · 83.9% here, 77.3% nationally
  • Median graduation year1988 · the 127 records with a school on file

Source: CMS NPPES, file of Aug 9, 2026 (primary taxonomy 174400000X); CMS Medicare Part D Prescribers 2024, MIPS 2023, Open Payments 2024 and Doctors and Clinicians, matched by NPI.

What the count covers

1,154 NPPES records list specialist (174400000X) as their primary taxonomy with a practice address in Illinois: 9 per 100,000 residents against 18 nationally (50 states and D.C.). Chicago has 231 of them (20%).

A record is a registration a provider made and keeps up to date: it shows neither that the provider is licensed nor that they still practice there. The state's own license search is the check.

States with a similar number

  1. Colorado1,105
  2. Massachusetts1,096
  3. Oregon1,085
  4. New Hampshire1,010

States with a similar rate per 100,000

  1. Virginia9.2
  2. Nebraska9.3
  3. Idaho9.0
  4. Wyoming9.4

The largest states

  1. New York22,636
  2. California5,749
  3. Florida2,685
  4. Washington2,609
  5. Pennsylvania2,031

Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy; 2023 Census population estimates. A registry record is not a license.

Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.