Robert Bayer, M.D.
NPI 1669527818 · Hematology & Oncology Physician · Geneva, IL
Enrolled with Medicare as Practitioner - Hematology/Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Robert Bayer, M.D. is a Hematology & Oncology Physician provider in Geneva, IL (NPI 1669527818).
Provider details
- NPI number
- 1669527818
- Entity type
- Individual
- Primary specialty
- Hematology & Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 036073155 (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
1,677 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 | 395 | $125 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 285 | $179 |
| Telephone Medical Discussion With Physician, 21-30 Minutes99443 | 218 | $126 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 205 | $89 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 186 | $16 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 31 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Acyclovir | 126 | 45 |
| Prednisone | 98 | 29 |
| Apixabanbrand: Eliquis | 74 | 28 |
| Hydroxyurea | 69 | 18 |
| Rivaroxabanbrand: Xarelto | 67 | 20 |
| Lenalidomidebrand: Revlimid | 61 | — |
| Ondansetronbrand: Ondansetron Odt | 55 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$34 across 1 record (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
- 2007-01-25
- Last updated
- 2013-04-01
Frequently asked questions
- What is Robert Bayer's NPI number?
- Robert Bayer's National Provider Identifier (NPI) is 1669527818, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Robert Bayer's specialty?
- Robert Bayer is listed in the NPPES registry with a primary specialty of Hematology & Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Robert Bayer located?
- Robert Bayer's practice location on file with NPPES is 351 Delnor Dr, Geneva, IL 60134-4220.
- What is Robert Bayer's phone number?
- The practice phone number listed in the NPPES registry for Robert Bayer is (630) 232-0610.
- Does Robert Bayer accept Medicare?
- Robert Bayer is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Robert Bayer's NPI active?
- Yes — Robert Bayer's NPI (1669527818) is active in the NPPES registry as of the last update on 2013-04-01.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.