William Gradishar, MD
NPI 1437187929 · Medical Oncology Physician · Chicago, IL
Enrolled with Medicare as Practitioner - Medical Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Gradishar, MD is a Medical Oncology Physician provider in Chicago, IL (NPI 1437187929).
Provider details
- NPI number
- 1437187929
- Entity type
- Individual
- Primary specialty
- Medical Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 036067208 (IL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
1,654 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 616 | $132 |
| Injection of Additional New Drug Or Substance Into Vein96375 | 239 | $16 |
| Administration of Chemotherapy Into Vein, 1 Hour Or Less96413 | 210 | $132 |
| Injection of Drug Or Substance Under Skin Or Into Muscle96372 | 96 | $15 |
| Infusion Into a Vein for Therapy, Prevention, Or Diagnosis, Additional Sequential Infusion, 1 Hour Or Less96367 | 92 | $29 |
| Administration of Hormonal Anti-Neoplastic Chemotherapy Under Skin Or Into Muscle96402 | 71 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 11 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Anastrozole | 300 | 97 |
| Palbociclibbrand: Ibrance | 51 | — |
| Tamoxifen Citrate | 51 | 18 |
| Letrozole | 49 | 17 |
| Exemestane | 46 | 14 |
| Ribociclib Succinatebrand: Kisqali | 35 | — |
| Capivasertibbrand: Truqap | 24 | — |
| Prochlorperazine Maleate |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$43,828 across 34 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-06-30
- Last updated
- 2009-07-17
Frequently asked questions
- What is William Gradishar's NPI number?
- William Gradishar's National Provider Identifier (NPI) is 1437187929, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Gradishar's specialty?
- William Gradishar is listed in the NPPES registry with a primary specialty of Medical Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is William Gradishar located?
- William Gradishar's practice location on file with NPPES is 675 N Saint Clair St, Chicago, IL 60611-5975.
- What is William Gradishar's phone number?
- The practice phone number listed in the NPPES registry for William Gradishar is (312) 695-0990.
- Does William Gradishar accept Medicare?
- William Gradishar is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Gradishar's NPI active?
- Yes — William Gradishar's NPI (1437187929) is active in the NPPES registry as of the last update on 2009-07-17.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.