Jaroslaw Jac, MD
NPI 1326029802 · Hematology & Oncology Physician · Westborough, MA
Enrolled with Medicare as Practitioner - Hematology/Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Jaroslaw Jac, MD is a Hematology & Oncology Physician provider in Westborough, MA (NPI 1326029802).
Provider details
- NPI number
- 1326029802
- Entity type
- Individual
- Primary specialty
- Hematology & Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 35312 (NH)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
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 tenure25% of score
20 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
732 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 | 363 | $96 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 135 | $65 |
| Initial Hospital Care With Straightforward Or Low-Level Medical Decision Making, If Using Time, at Least 55 Minutes99222 | 100 | $129 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 78 | $169 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 36 | $143 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 19 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Prochlorperazine Maleate | 44 | 23 |
| Sulfamethoxazole/Trimethoprimbrand: Sulfamethoxazole-Trimethoprim | 32 | — |
| Enzalutamidebrand: Xtandi | 27 | — |
| Oxycodone Hcl | 21 | — |
| Acyclovir | 21 | — |
| Dexamethasone | 21 | 11 |
| Anastrozole | 20 | — |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$181 across 8 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
Additional practice locations (1)
- 3073 White Mountain HwyNorth Conway, NH 03860-7101Phone: (603) 356-4904Fax: (603) 356-0842
Registry dates
- Enumerated
- 2005-11-10
- Last updated
- 2025-07-02
- Certified
- 2025-07-02
Frequently asked questions
- What is Jaroslaw Jac's NPI number?
- Jaroslaw Jac's National Provider Identifier (NPI) is 1326029802, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Jaroslaw Jac's specialty?
- Jaroslaw Jac is listed in the NPPES registry with a primary specialty of Hematology & Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Jaroslaw Jac located?
- Jaroslaw Jac's practice location on file with NPPES is 150 Flanders Rd, Westborough, MA 01581-1017.
- What is Jaroslaw Jac's phone number?
- The practice phone number listed in the NPPES registry for Jaroslaw Jac is (508) 870-2222.
- Does Jaroslaw Jac accept Medicare?
- Jaroslaw Jac is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Jaroslaw Jac's NPI active?
- Yes — Jaroslaw Jac's NPI (1326029802) is active in the NPPES registry as of the last update on 2025-07-02.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.