Michael Breen, MD, PHD
NPI 1669861449 · Hematology & Oncology Physician · Libertyville, IL
Enrolled with Medicare as Practitioner - Hematology/Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Michael Breen, MD, PHD is a Hematology & Oncology Physician provider in Libertyville, IL (NPI 1669861449).
Provider details
- NPI number
- 1669861449
- Entity type
- Individual
- Primary specialty
- Hematology & Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD, PHD
- Sex
- Male
- Sole proprietor
- No
- License
- 036149848 (IL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
11 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
1,223 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 633 | $143 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 195 | $97 |
| 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 |
| New Patient Office Or Other Outpatient Visit With a High Level of Medical Decision Making, If Using Time, 60 Minutes Or More99205 | 56 | $182 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 52 | $118 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 15 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Prochlorperazine Maleate | 97 | 56 |
| Dexamethasone | 43 | 27 |
| Ondansetron Hcl | 41 | 27 |
| Apixabanbrand: Eliquis | 38 | 19 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 37 | 24 |
| Prednisone | 36 | 18 |
| Osimertinib Mesylatebrand: Tagrisso |
Practice location
Mailing address
Registry dates
- Enumerated
- 2015-01-15
- Last updated
- 2022-10-13
- Certified
- 2022-10-13
Frequently asked questions
- What is Michael Breen's NPI number?
- Michael Breen's National Provider Identifier (NPI) is 1669861449, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Michael Breen's specialty?
- Michael Breen is listed in the NPPES registry with a primary specialty of Hematology & Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Michael Breen located?
- Michael Breen's practice location on file with NPPES is 1800 Hollister Dr Ste 112, Libertyville, IL 60048-5265.
- What is Michael Breen's phone number?
- The practice phone number listed in the NPPES registry for Michael Breen is (847) 367-6781.
- Does Michael Breen accept Medicare?
- Michael Breen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Michael Breen's NPI active?
- Yes — Michael Breen's NPI (1669861449) is active in the NPPES registry as of the last update on 2022-10-13.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.