NPIMap

Individual provider Active NPI

Colin D Weekes, MD

  • Medical Oncology Physician
  • Boston, MA
National Provider Identifier
1043366750
Registry record updated Mar 24, 2026
On this page

Key facts

NPPES NPI Registry
Primary specialty
Medical Oncology PhysicianTaxonomy code 207RX0202X
License
269790 Issued in MA
Practice address
55 Fruit St
Boston, MA 02114-2621
Phone
(866) 493-1612
NPI assigned
Jan 26, 2007
Sex
Male
Sole proprietor
No

NPPES NPI Registry

Updated by the provider on Mar 24, 2026

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

Specialties & licenses 3

Specialty (taxonomy)CodeLicenseStatePrimary
Medical Oncology Physician 207RX0202X 269790 MA Primary
Medical Oncology Physician 207RX0202X 45860 CO
Medical Oncology Physician 207RX0202X D59858 MD

Addresses

Primary practice location

55 Fruit St
Boston, MA 02114-2621

Mailing address

55 Fruit St
Boston, MA 02114-2621

Other practice location 1

600 N Wolfe St
Baltimore, MD 21287-0005
Phone (410) 955-5000

Other practice location 2

1665 Ursula St
Aurora, CO 80045-7402
Phone (303) 724-0295

Other practice location 3

75 Francis St
Boston, MA 02115-6110
Phone (617) 732-5500

Other identifiers 1

IdentifierTypeStateIssuer
D0059858MedicaidMD

Medicare participation

Medicare enrollment files
Medicare fee-for-service enrollment
Enrolled in MA, MD2 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 2

Enrollment IDStateProvider typePAC IDDetails
I20170530001658 MA Practitioner - Medical OncologyPractitioner - Hematology 7214029230 Reassigns benefits to 3 organizations
I20241223002929 MD Practitioner - Medical Oncology 7214029230 Reassigns benefits to 1 organization

Care Compare profile

Medicare Care Compare
Specialty
Medical OncologyAlso: Hematology
Education
Other, 2000
Medicare assignment
Accepts the Medicare-approved amount as payment in full
Telehealth
Offers telehealth services
Group practices
The General Hospital CorporationGroup PAC ID 6507803806, 1,275 clinicians

Practice addresses (Care Compare)

40 2ND Ave
Waltham, MA 02451-1132
Phone (781) 487-2900

55 Fruit St
Boston, MA 02114-2621
Phone (617) 726-2000

55 Fruit St
Boston, MA 02114-2696
Phone (617) 724-0287

75 Francis St
Boston, MA 02115-6110
Phone (617) 732-5500

Hospital & facility affiliations

National Provider Directory

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

State licenses

LicenseStateTypeSpecialty
45860COMDMedical Oncology Physician
269790MAMDMedical Oncology Physician
D59858MDMDMedical Oncology Physician

Practice roles

OrganizationSpecialtyStatusNew patients
Johns Hopkins University CurrentSince Nov 1, 2024 Accepting new patients
Massachusetts General Physicians Organization Inc CurrentSince Jul 1, 2017 Accepting new patients
General Hospital Corp Current Accepting new patients
Johns Hopkins University CurrentSince Nov 1, 2024 Accepting new patients
Brigham & Womens Physicians Organization Inc CurrentSince Jan 18, 2026 Accepting new patients
Johns Hopkins University Current Accepting new patients
The General Hospital Corporation CurrentSince Jul 1, 2017 Accepting new patients
Brigham and Womens Physicians Organization Inc Past Accepting new patients

Locations

75 Francis St
Boston, MA 02115

55 Fruit St
Ste 7E
Boston, MA 02114
Phone (617) 643-0237

55 Fruit St
Boston, MA 02114

55 Fruit St
#2
Boston, MA 02114
Phone (617) 726-2967

600 N Wolfe St
Baltimore, MD 21287

5755 Cedar Ln
Columbia, MD 21044
Phone (410) 381-7171

6201 Greenleigh Ave
Fl 2
Middle River, MD 21220
Phone (410) 933-2704

6201 Greenleigh Ave
Middle River, MD 21220
Phone (410) 933-2704

Interoperability endpoints

  • Direct secure messaging: weekes.colin.mgh@direct.partners.masshiway.net

Organizations & group practices 8

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.

Hospital & facility affiliations 7

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

NPI Registry JSON

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

{
    "created_epoch": "1169769600000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1774310400000",
    "number": "1043366750",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "55 FRUIT ST",
            "city": "BOSTON",
            "state": "MA",
            "postal_code": "021142621"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "55 FRUIT ST",
            "city": "BOSTON",
            "state": "MA",
            "postal_code": "021142621",
            "telephone_number": "866-493-1612"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "600 N Wolfe St",
            "address_purpose": "LOCATION",
            "city": "Baltimore",
            "state": "MD",
            "postal_code": "212870005",
            "country_code": "US",
            "telephone_number": "410-955-5000",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "address_1": "1665 Ursula St",
            "address_purpose": "LOCATION",
            "city": "Aurora",
            "state": "CO",
            "postal_code": "800457402",
            "country_code": "US",
            "telephone_number": "303-724-0295",
            "fax_number": "303-724-3889",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "address_1": "75 Francis St",
            "address_purpose": "LOCATION",
            "city": "Boston",
            "state": "MA",
            "postal_code": "021156110",
            "country_code": "US",
            "telephone_number": "617-732-5500",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "WEEKES",
        "first_name": "COLIN",
        "middle_name": "D",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2007-01-26",
        "last_updated": "2026-03-24",
        "certification_date": "2026-03-24",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207RX0202X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Medical Oncology",
            "state": "MA",
            "license": "269790",
            "primary": true
        },
        {
            "code": "207RX0202X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Medical Oncology",
            "state": "CO",
            "license": "45860",
            "primary": false
        },
        {
            "code": "207RX0202X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Medical Oncology",
            "state": "MD",
            "license": "D59858",
            "primary": false
        }
    ],
    "identifiers": [
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "D0059858",
            "state": "MD"
        }
    ],
    "endpoints": [],
    "other_names": []
}

Other providers in Boston, MA

Sources for this page

Verify at the official NPI Registry.