NPPES file of Aug 9, 2026

William Bartz, MSW, LCSW

Clinical Social Worker · Chicago, IL

William Bartz, MSW, LCSW is a clinical social worker with a practice address in Chicago, Illinois, and NPI 1225914740, issued on Aug 12, 2025. Check the license (Illinois 149030313, as entered in NPPES) with the Illinois board that licenses this profession; the Medicare figures below come from public CMS files.

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

NPPES recordNPPES file of Aug 9, 2026
1225914740
Name
William Bartz
Credential
MSW, LCSW
Primary taxonomy
Clinical Social Worker 1041C0700X
License number
149030313 IL
Self-reported in NPPES; status is on the state search
Practice location
4141 N Kedzie Ave, Chicago, IL 60618
Phone
(773) 754-0577
Enumerated
Aug 12, 2025
Record last updated
Mar 22, 2026
Medicare enrollment
Enrolled (PECOS I20260218000150); accepts Medicare assignment
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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8 nearest clinical social worker records → All 13,637 in Illinois → Look up another NPI →

Also registered at 4141 N Kedzie Ave

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

  1. Rebecca Burwell, MA, PHDMental Health Counselor1285503045
  2. Michelle LopezStudent in an Organized Health Care Education/Training Program1912872920
  3. Itzel PerezStudent in an Organized Health Care Education/Training Program1548124753
  4. Cecelia Quinn, L.C.S.W.Clinical Social Worker1427446038
  5. Farrah SklarMental Health Counselor1053284521

Verify William Bartz 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 149030313    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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Bills Medicare through one group practice

  1. Emily Hanneman Lcsw PLLCChicago, IL

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

William Bartz among 13,637 clinical social worker records in Illinois

William Bartz, MSW, LCSW is one of 13,637 clinical social worker records with a practice address in Illinois. 14% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2025, is newer than 92% of them.

  • NPI issued2025 · 92% of these records are older, 3% newer
  • In a Medicare fileYes · 14% of these records are
  • In the CMS Doctors and Clinicians fileYes · 21% of these records are
  • Graduated2023 · median 2010 among the 2,895 with a school on file
  • Record last updated2026 · 54% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 1041C0700X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

4,368 clinical social worker records list a practice address in Chicago

They are 4,368 of the 63,379 NPPES records with a practice address in Chicago, and 13,637 clinical social worker records in Illinois.

All 13,637 in Illinois → Every provider in Chicago → Clinical Social Worker nationwide →

The 8 clinical social worker records with the nearest ZIP codes

  1. Lisa Berns, LCSWChicago, IL 606181619022845
  2. Jason Best, LCSWChicago, IL 606181154440105
  3. Joan Brogdon, LCSWChicago, IL 606181003868407
  4. Tracy Cooper, MSW, LCSW, EI-IMHChicago, IL 606181801876552
  5. Carol Ganzer-Child, LCSWChicago, IL 606181801992045
  6. Phyllis Gould, LCSWChicago, IL 606181215920608
  7. Joel Gratch, LCSWChicago, IL 606181356418487
  8. Juanita Guillermo, LCSW, ACSWChicago, IL 606181508995812

Common questions

What is William Bartz, MSW, LCSW's NPI number?

William Bartz, MSW, LCSW's National Provider Identifier (NPI) is 1225914740, issued on Aug 12, 2025. An NPI identifies a provider in billing; it is not a license.

Where is William Bartz, MSW, LCSW located?

The NPPES record lists a practice address at 4141 N Kedzie Ave, Chicago, IL, 60618. Phone: (773) 754-0577. Providers update this record themselves, so call before visiting.

How can I verify William Bartz, MSW, LCSW's license?

NPPES lists Illinois license number 149030313, 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. Medicare files from data.cms.gov. 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.