NPPES file of Aug 9, 2026

Mark Williams

Addiction (Substance Use Disorder) Counselor · Chicago, IL

Mark Williams is an addiction (substance use disorder) counselor with a practice address in Chicago, Illinois, and NPI 1215522602, issued on Mar 8, 2021. Check the license (Illinois 26701, as entered in NPPES) with the Illinois board that licenses this profession; the federal record below is the public data PlainDoctor holds for this provider.

Record from CMS NPPES, file of Aug 9, 2026 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1215522602
Name
Mark Williams
Primary taxonomy
Addiction (Substance Use Disorder) Counselor 101YA0400X
License number
26701 IL
Self-reported in NPPES; status is on the state search
Practice location
200 W Monroe St Ste 1150, Chicago, IL 60606
Phone
(314) 369-8849
Enumerated
Mar 8, 2021
Record last updated
Mar 8, 2021 (not updated in 5 years: call before relying on the address or phone)
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). A record is not a license: verify it with the state board.
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8 nearest addiction (substance use disorder) counselor records → All 1,195 in Illinois → Look up another NPI →

Also registered at 200 W Monroe St Ste 1150

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Fayza AbujadoMental Health Counselor1407528235
  2. Jessie Beebe, LCSWClinical Social Worker1831716935
  3. Carolyn BloomAddiction (Substance Use Disorder) Counselor1255924676
  4. Jamie Hock, LCSWClinical Social Worker1790303824
  5. Chiayu McGillCase Manager/Care Coordinator1881287217
  6. Nick StarkeyCounselor1548853963

Verify Mark Williams in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersWhich Illinois board licenses this profession
    Search for license 26701    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Find the Illinois license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

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Mark Williams among 1,195 addiction (substance use disorder) counselor records in Illinois

Mark Williams is one of 1,195 addiction (substance use disorder) counselor records with a practice address in Illinois. 1% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2021, is newer than 72% of them.

  • NPI issued2021 · 72% of these records are older, 24% newer
  • In a Medicare fileNo · 1% of these records are
  • In the CMS Doctors and Clinicians fileNo · 3% of these records are
  • Record last updated2021 · 66% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 101YA0400X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Addiction (Substance Use Disorder) Counselor providers in Illinois

There are 1,195 addiction (substance use disorder) counselor records in Illinois. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.

All 1,195 in Illinois → Every provider in Chicago → Addiction (Substance Use Disorder) Counselor nationwide →

The 8 addiction (substance use disorder) counselor records with the nearest ZIP codes

  1. Carolyn BloomChicago, IL 606061255924676
  2. Genevieve Andres, ASChicago, IL 606071992355515
  3. Bonnie BurrellChicago, IL 606071932759891
  4. Kim FieldsChicago, IL 606071487287140
  5. John FogartyChicago, IL 606051316603632
  6. Estralita Jones-Roach, CADCChicago, IL 606071821560152
  7. Gwendolyn Maxwell, CADCChicago, IL 606071114576113
  8. Latangler NixChicago, IL 606071821621673

Common questions

What is Mark Williams's NPI number?

Mark Williams's National Provider Identifier (NPI) is 1215522602, issued on Mar 8, 2021. An NPI identifies a provider in billing; it is not a license.

Where is Mark Williams located?

The NPPES record lists a practice address at 200 W Monroe St Ste 1150, Chicago, IL, 60606. Phone: (314) 369-8849. Providers update this record themselves, so call before visiting.

How can I verify Mark Williams's license?

NPPES lists Illinois license number 26701, as entered by the provider. Search the Illinois board that licenses this profession; the NPPES record confirms identity only.

Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. An NPI identifies who bills; it is not a license.

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

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.