Robert Mcwilliams, M.D.
NPI 1487633962 · Medical Oncology Physician · Peoria, IL
Enrolled with Medicare as Practitioner - Medical Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Robert Mcwilliams, M.D. is a Medical Oncology Physician provider in Peoria, IL (NPI 1487633962).
Provider details
- NPI number
- 1487633962
- Entity type
- Individual
- Primary specialty
- Medical Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 036131628 (IL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
617 Medicare services, 2024 (ranked within specialty)
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 methodology.
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) |
|---|---|---|
| Injection of Additional New Drug Or Substance Into Vein96375 | 131 | $16 |
| Administration of Chemotherapy Into Vein, 1 Hour Or Less96413 | 97 | $134 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 82 | $181 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 64 | $130 |
| Administration of Non-Hormonal Anti-Neoplastic Chemotherapy Under Skin Or Into Muscle96401 | 34 | $74 |
| Administration of Chemotherapy Into Vein, Each Additional Hour96415 | 31 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 7 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Dexamethasone | 41 | 16 |
| Ondansetron Hcl | 27 | 16 |
| Lipase/Protease/Amylasebrand: Creon | 20 | 11 |
| Olanzapine | 20 | 12 |
| Prochlorperazine Maleate | 16 | 15 |
| Apixabanbrand: Eliquis | 15 | — |
| Loperamide Hclbrand: Loperamide | 11 | — |
These counts cover prescriptions paid through Medicare Part D in 2024 — they include cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means , never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Additional practice locations (1)
- 200 1st St SwRochester, MN 55905-0001Phone: (507) 284-2511
Registry dates
- Enumerated
- 2006-01-12
- Last updated
- 2026-02-25
- Certified
- 2026-02-25
Frequently asked questions
- What is Robert Mcwilliams's NPI number?
- Robert Mcwilliams's National Provider Identifier (NPI) is 1487633962, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Robert Mcwilliams's specialty?
- Robert Mcwilliams is listed in the NPPES registry with a primary specialty of Medical Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Robert Mcwilliams located?
- Robert Mcwilliams's practice location on file with NPPES is 530 Ne Glen Oak Ave, Peoria, IL 61637-0001.
- What is Robert Mcwilliams's phone number?
- The practice phone number listed in the NPPES registry for Robert Mcwilliams is (309) 655-2000.
- Does Robert Mcwilliams accept Medicare?
- Robert Mcwilliams is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Robert Mcwilliams's NPI active?
- Yes — Robert Mcwilliams's NPI (1487633962) is active in the NPPES registry as of the last update on 2026-02-25.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.