NPPES file of Aug 9, 2026

William T. Leslie, M.D.

Hematology & Oncology Physician · Chicago, IL

William T. Leslie, M.D. is a hematology & oncology physician with a practice address in Chicago, Illinois, and NPI 1538129275, issued on Mar 25, 2006. Check the license (Illinois 036-058921, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1538129275
Name
William T. Leslie
Credential
M.D.
Primary taxonomy
Hematology & Oncology Physician 207RH0003X
License number
036-058921 IL
Self-reported in NPPES; status is on the state search
Practice location
1725 W Harrison St, Chicago, IL 60612
Phone
(312) 942-5904
Enumerated
Mar 25, 2006
Record last updated
Apr 14, 2011 (not updated in 15 years: call before relying on the address or phone)
Medicare enrollment
Enrolled (PECOS I20050421001318); accepts Medicare assignment
Telehealth
Offers telehealth (CMS)
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 hematology & oncology physician records → All 666 in Illinois → Look up another NPI →

Also registered at 1725 W Harrison St

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

  1. Qurrat-Ul-Ain Abid, MDHospice and Palliative Medicine (Internal Medicine) Physician1053949024
  2. John Acheson, MDSurgery Physician1205528726
  3. David Agbunag, PA-CSurgical Physician Assistant1093885188
  4. Eda Akyar, MDSports Medicine (Family Medicine) Physician1255910006
  5. Jorelle Alexander, DMD,MPHDentist1972790756
  6. Amjad Ali, M.D.Specialist1952359184

Verify William T. Leslie in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersIllinois Department of Financial and Professional Regulation
    Search for license 036-058921    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
Open the Illinois license search

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26% more Medicare Part D claims than the average hematology & oncology physician in 2024

1,102 Medicare Part D claims for 154 beneficiaries, against an average of 877 among the 10,784 providers of this specialty who prescribed in Part D. Brand-name drugs were 8% of claims. 301 claims were for opioids.

  1. William Leslie1,102
  2. Specialty average877

Most prescribed

  1. Hydrocodone-Acetaminophen159 claims
  2. Ondansetron Hcl87 claims
  3. Prochlorperazine Maleate83 claims
  4. Loperamide59 claims
  5. Oxycodone Hcl48 claims
  6. Alprazolam42 claims

Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.

Industry payments in 2024: $69.99

1 payment: education; the largest payer was Ipsen Biopharmaceuticals, Inc. The 8,560 providers of this specialty with any payment received $7,481.41 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.

  1. William Leslie$69.99
  2. Specialty average$7,481.41

Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.

Bills Medicare through one group practice

  1. Rush University Medical GroupChicago, IL

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

William T. Leslie among 666 hematology & oncology physician records in Illinois

William T. Leslie, M.D. is one of 666 hematology & oncology physician records with a practice address in Illinois. 84% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 15% of them.

  • NPI issued2006 · 15% of these records are older, 57% newer
  • In a Medicare fileYes · 84% of these records are
  • In the CMS Doctors and Clinicians fileYes · 69% of these records are
  • Graduated1978 · median 2003 among the 461 with a school on file
  • Record last updated2011 · 49% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RH0003X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Hematology & Oncology Physician providers in Illinois

There are 666 hematology & oncology physician records in Illinois.

All 666 in Illinois → Every provider in Chicago → Hematology & Oncology Physician nationwide →

The 8 hematology & oncology physician records with the nearest ZIP codes

  1. Piernicola Boccuni, M.D.Chicago, IL 606121851451926
  2. Lisa Boggio, MDChicago, IL 606121336116151
  3. Rosalind Catchatourian, MDChicago, IL 606121881602092
  4. Carmel Chou, M.D.Chicago, IL 606121316024086
  5. Lawrence FeldmanChicago, IL 606121871607051
  6. Victor Gordeuk, MDChicago, IL 606121033270046
  7. Robert Molokie, M.D.Chicago, IL 606121114969136
  8. David PeaceChicago, IL 606121609980911

Common questions

What is William T. Leslie, M.D.'s NPI number?

William T. Leslie, M.D.'s National Provider Identifier (NPI) is 1538129275, issued on Mar 25, 2006. An NPI identifies a provider in billing; it is not a license.

Where is William T. Leslie, M.D. located?

The NPPES record lists a practice address at 1725 W Harrison St, Chicago, IL, 60612. Phone: (312) 942-5904. Providers update this record themselves, so call before visiting.

How can I verify William T. Leslie, M.D.'s license?

NPPES lists Illinois license number 036-058921, as entered by the provider. Search the Illinois Department of Financial and Professional Regulation at https://idfpr.illinois.gov/checklicense.html. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.

How much does William T. Leslie, M.D. prescribe under Medicare Part D?

In 2024, William T. Leslie, M.D. had 1,102 Medicare Part D claims for 154 beneficiaries; the average among hematology & oncology physician prescribers was 877. Part D covers Medicare prescriptions 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.