Jeffrey Halaas, MD
NPI 1851346928 · Hematology & Oncology Physician · Brewster, NY
Enrolled with Medicare as Practitioner - Hematology/Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Jeffrey Halaas, MD is a Hematology & Oncology Physician provider in Brewster, NY (NPI 1851346928).
Provider details
- NPI number
- 1851346928
- Entity type
- Individual
- Primary specialty
- Hematology & Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 219677 (NY)
Specialties & taxonomies
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
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
8,456 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) |
|---|---|---|
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 1,557 | $9 |
| Complete Blood Cell Count (red Cells, White Blood Cell, Platelets), Automated Test and Automated Differential White Blood Cell Count85025 | 1,287 | $8 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 1,079 | $140 |
| Blood Test, Comprehensive Group of Blood Chemicals80053 | 846 | $10 |
| 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 | 651 | $18 |
| Injection of Additional New Drug Or Substance Into Vein |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 38 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Hydroxyurea | 160 | 41 |
| Anastrozole | 140 | 43 |
| Prednisone | 104 | 35 |
| Abiraterone Acetate | 94 | 14 |
| Apixabanbrand: Eliquis | 81 | 20 |
| Zanubrutinibbrand: Brukinsa | 77 | 11 |
| Ibrutinibbrand: Imbruvica | 53 | — |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-05-24
- Last updated
- 2016-11-17
Frequently asked questions
- What is Jeffrey Halaas's NPI number?
- Jeffrey Halaas's National Provider Identifier (NPI) is 1851346928, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Jeffrey Halaas's specialty?
- Jeffrey Halaas is listed in the NPPES registry with a primary specialty of Hematology & Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Jeffrey Halaas located?
- Jeffrey Halaas's practice location on file with NPPES is 185 Route 312, Brewster, NY 10509-2337.
- What is Jeffrey Halaas's phone number?
- The practice phone number listed in the NPPES registry for Jeffrey Halaas is (845) 231-5600.
- Does Jeffrey Halaas accept Medicare?
- Jeffrey Halaas is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Jeffrey Halaas's NPI active?
- Yes — Jeffrey Halaas's NPI (1851346928) is active in the NPPES registry as of the last update on 2016-11-17.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.