NPIMap

Individual provider Active NPI

Jaroslaw Jac, MD

  • Hematology & Oncology Physician
  • Westborough, MA
National Provider Identifier
1326029802
Registry record updated Jul 24, 2026
On this page

Key facts

NPPES NPI Registry
Primary specialty
Hematology & Oncology PhysicianTaxonomy code 207RH0003X
License
238060 Issued in MA
Practice address
150 Flanders Rd
Westborough, MA 01581-1017
Phone
(508) 870-2222
NPI assigned
Nov 10, 2005
Sex
Male
Sole proprietor
No

NPPES NPI Registry

Updated by the provider on Jul 24, 2026

Registry information is reported by the provider to CMS and is not verified. About this source

Specialties & licenses 6

Specialty (taxonomy)CodeLicenseStatePrimary
Internal Medicine Physician 207R00000X 238060 MA
Hematology & Oncology Physician 207RH0003X 35312 NH
Internal Medicine Physician 207R00000X 35312 NH
Hematology & Oncology Physician 207RH0003X 238060 MA Primary
Hematology & Oncology Physician 207RH0003X J9106 TX
Hematology & Oncology Physician 207RH0003X MD13980 ME

Addresses

Primary practice location

150 Flanders Rd
Westborough, MA 01581-1017

Mailing address

15 Hospital Dr
York, ME 03909-1011
Phone (207) 351-2478

Other practice location 1

3073 White Mountain Hwy
North Conway, NH 03860-7101
Phone (603) 356-4904

Other practice location 2

580 Court St
Keene, NH 03431-1718
Phone (603) 354-5400

Other identifiers 2

IdentifierTypeStateIssuer
139379518MedicaidTX
110081560/AMedicaidMA

Medicare participation

Medicare enrollment files
Medicare fee-for-service enrollment
Enrolled in MA, NH, ME3 enrollments
Eligible to order & refer
  • Part B services
  • Medical equipment
  • Home health
  • Power mobility devices
  • Hospice
Green means eligible to order or refer.

Enrollment records 3

Enrollment IDStateProvider typePAC IDDetails
I20090121000341 MA Practitioner - Hematology/OncologyPractitioner - Internal Medicine 0244288371 Reassigns benefits to 8 organizations
I20180322002795 NH Practitioner - Hematology/Oncology 0244288371 Reassigns benefits to 2 organizations
I20190125000553 ME Practitioner - Hematology/Oncology 0244288371 Reassigns benefits to 1 organization

Care Compare profile

Medicare Care Compare
Specialty
Hematology/OncologyAlso: Internal Medicine
Education
Other, 1990
Medicare assignment
Accepts the Medicare-approved amount as payment in full
Group practices
Community Medical Associates, Inc.Group PAC ID 6002946928, 155 clinicians

Practice addresses (Care Compare)

70 E St
Methuen, MA 01844-4597
Phone (978) 687-0151

Hospital & facility affiliations

  • Memorial Hospital, the Hospital, North Conway, NH, CCN 301307
  • Holy Family Hospital Hospital, Methuen, MA, CCN 220080
  • Umass Memorial Health - Harrington Hospital Hospital, Southbridge, MA, CCN 220019
  • Mainehealth Maine Medical Center Hospital, Portland, ME, CCN 200009
  • Anna Jaques Hospital Hospital, Newburyport, MA, CCN 220029

National Provider Directory

National Provider Directory
Medicare enrollment (NPD)
Enrolled
Credentials
Doctor of Medicine

State licenses

LicenseStateTypeSpecialty
35312NHMDHematology & Oncology Physician

Practice roles

OrganizationSpecialtyStatusNew patients
Ipc Hospitalists of New England, P.C. Internal Medicine Current Accepting new patients
Cambridge Public Health Commission CurrentSince Mar 4, 2018 Accepting new patients
Steward Medical Group, Inc CurrentSince Apr 5, 2014 Accepting new patients
Steward Medical Group, Inc CurrentSince Apr 5, 2014 Accepting new patients
Ipc Hospitalists of New England, P.C. Internal Medicine CurrentSince Feb 5, 2009 Accepting new patients
Saint Vincent Physician Services, Inc. Internal Medicine CurrentSince Jun 17, 2022 Accepting new patients
York Hospital CurrentSince Jan 7, 2019 Accepting new patients
General Primary Care of Lawrence CurrentSince Oct 20, 2025 Accepting new patients
Memorial Hospital CurrentSince Sep 26, 2025 Accepting new patients
Associated Physicians of Harvard Medical Faculty Physicians at Beth Is CurrentSince Apr 1, 2025 Accepting new patients
Seacoast Pathology Inc Current Accepting new patients
Lawrence General Hospital Internal Medicine Current Accepting new patients
Community Medical Associates, Inc. CurrentSince Oct 1, 2024 Accepting new patients
Associated Physicians of Harvard Medical Faculty Physicians at Beth Is Internal Medicine CurrentSince Apr 1, 2025 Accepting new patients
Memorial Hospital CurrentSince Sep 26, 2025 Accepting new patients
Lawrence General Hospital CurrentSince Oct 20, 2025 Accepting new patients
Ipc Hospitalists of New England PC Internal Medicine CurrentSince Feb 5, 2009 Accepting new patients
Memorial Hospital Hematology & Oncology CurrentSince Sep 26, 2025 Accepting new patients
Steward Holy Family Hospital, Inc. Past Accepting new patients
LG Newcorp Inc Past Accepting new patients

Locations

11 Nevins St
Ste 201
Brighton, MA 02135
Phone (617) 789-2442

1493 Cambridge St
Cambridge, MA 02139
Phone (617) 665-1185

103 Garland St
Everett, MA 02149
Phone (617) 381-7150

115 Lincoln St
Framingham, MA 01702
Phone (508) 383-1000

140 Lincoln Ave
Haverhill, MA 01830
Phone (978) 374-2000

145 Ward Hill Ave
Haverhill, MA 01835
Phone (978) 258-4734

100 Amesbury St
Ste 103
Lawrence, MA 01840
Phone (978) 683-0157

1 General St
Lawrence, MA 01841
Phone (978) 946-8103

60 East St
Ste 2300
Methuen, MA 01844

70 East St
Methuen, MA 01844
Phone (978) 682-1906

199 Reedsdale Rd
Milton, MA 02186
Phone (617) 313-1000

67 Union St
Natick, MA 01760
Phone (508) 383-1104

25 Highland Ave
Newburyport, MA 01950
Phone (978) 258-4734

111 Huntoon Memorial Hwy
Rochdale, MA 01542
Phone (508) 892-4858

100 South St
Southbridge, MA 01550
Phone (508) 764-8012

150 Flanders Rd
Westborough, MA 01581
Phone (508) 870-2222

1 Eaton Pl
#23
Worcester, MA 01608
Phone (508) 363-6515

55 Lake Ave N
Worcester, MA 01655
Phone 508334100048862

123 Summer St
#273
Worcester, MA 01608
Phone (508) 363-6327

127 Long Sands Rd
York, ME 03909
Phone (207) 351-3715

15 Hospital Dr
York, ME 03909
Phone (207) 351-2478

3073 White Mountain Hwy
North Conway, NH 03860
Phone (603) 356-5472

Interoperability endpoints

  • Direct secure messaging: jjac915521@direct.mmc.mainehealth.org

Organizations & group practices 21

Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships and National Provider Directory roles.

View all 21

Hospital & facility affiliations 44

Hospitals and other facilities this clinician is affiliated with according to Medicare Care Compare.

View all 44

NPI Registry JSON

The complete NPPES record for this NPI in the NPI Registry API format.

{
    "created_epoch": "1131580800000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1784851200000",
    "number": "1326029802",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "15 HOSPITAL DR",
            "city": "YORK",
            "state": "ME",
            "postal_code": "039091011",
            "telephone_number": "207-351-2478",
            "fax_number": "207-351-2216"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "150 FLANDERS RD",
            "city": "WESTBOROUGH",
            "state": "MA",
            "postal_code": "015811017",
            "telephone_number": "508-870-2222"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "3073 White Mountain Hwy",
            "address_purpose": "LOCATION",
            "city": "North Conway",
            "state": "NH",
            "postal_code": "038607101",
            "country_code": "US",
            "telephone_number": "603-356-4904",
            "fax_number": "603-356-0842",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "address_1": "580 Court St",
            "address_purpose": "LOCATION",
            "city": "Keene",
            "state": "NH",
            "postal_code": "034311718",
            "country_code": "US",
            "telephone_number": "603-354-5400",
            "fax_number": "603-640-1228",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "JAC",
        "first_name": "JAROSLAW",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2005-11-10",
        "last_updated": "2026-07-24",
        "certification_date": "2026-07-24",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "MA",
            "license": "238060",
            "primary": false
        },
        {
            "code": "207RH0003X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Hematology & Oncology",
            "state": "NH",
            "license": "35312",
            "primary": false
        },
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "NH",
            "license": "35312",
            "primary": false
        },
        {
            "code": "207RH0003X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Hematology & Oncology",
            "state": "MA",
            "license": "238060",
            "primary": true
        },
        {
            "code": "207RH0003X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Hematology & Oncology",
            "state": "TX",
            "license": "J9106",
            "primary": false
        },
        {
            "code": "207RH0003X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Hematology & Oncology",
            "state": "ME",
            "license": "MD13980",
            "primary": false
        }
    ],
    "identifiers": [
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "139379518",
            "state": "TX"
        },
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "110081560/A",
            "state": "MA"
        }
    ],
    "endpoints": [],
    "other_names": []
}

Other providers in Westborough, MA

Sources for this page

Verify at the official NPI Registry.