Individual provider Active NPI

Mark E Williams, MD

  • Nephrology Physician
  • Boston, MA
National Provider Identifier
1184653891
Registry record updated Apr 25, 2011
On this page

Key facts

NPPES NPI Registry
Primary specialty
Nephrology PhysicianTaxonomy code 207RN0300X
License
45103 Issued in MA
Practice address
1 Joslin PL
Boston, MA 02215-5306
Phone
(617) 732-2477
Fax
(617) 732-2467
NPI assigned
Jul 3, 2006
Sex
Male
Sole proprietor
No

NPPES NPI Registry

Updated by the provider on Apr 25, 2011

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

Specialties & licenses 2

Specialty (taxonomy)CodeLicenseStatePrimary
Specialist 174400000X 45103 MA
Nephrology Physician 207RN0300X 45103 MA Primary

Addresses

Primary practice location

1 Joslin PL
Boston, MA 02215-5306

Mailing address

31 Hereford St
Boston, MA 02115-1718
Phone (617) 267-5652

Other identifiers 1

IdentifierTypeStateIssuer
0112542MedicaidMA

Medicare participation

Medicare enrollment files
Medicare fee-for-service enrollment
Enrolled in MA, CA2 enrollments
Eligible to order & refer
  • Part B services: Yes
  • Medical equipment: Yes
  • Home health: Yes
  • Power mobility devices: Yes
  • Hospice: Yes
Green means eligible to order or refer.

Enrollment records 2

Enrollment IDStateProvider typePAC IDDetails
I20050829000815 MA Practitioner - Nephrology 2062443070 Reassigns benefits to 3 organizations
I20250808004060 CA Practitioner - NephrologyPractitioner - Internal Medicine 2062443070 Reassigns benefits to 2 organizations

Care Compare profile

Medicare Care Compare
Specialty
NephrologyAlso: Internal Medicine
Education
Indiana University School of Medicine, 1977
Medicare assignment
Accepts the Medicare-approved amount as payment in full
Telehealth
Offers telehealth services
Group practices
Usc Care Medical Non-Contracted LLCGroup PAC ID 6901263672, 18 clinicians
Usc Care Medical Group IncGroup PAC ID 0446157747, 1,378 clinicians

Practice addresses (Care Compare)

1441 Eastlake Ave
Los Angeles, CA 90089-0112
Phone (323) 865-3000

1500 San Pablo St
Los Angeles, CA 90033-5313
Phone (323) 442-8444

1516 San Pablo St
Los Angeles, CA 90033-5313
Phone (800) 872-2273

1520 San Pablo St
Los Angeles, CA 90033-5310
Phone (800) 872-2273

1520 San Pablo St 1St Floor N
Los Angeles, CA 90033-5310
Phone (800) 872-2273

2310 Alcazar St
Los Angeles, CA 90033-5327
Phone (323) 441-9966

300 W Hungtington Dr
Arcadia, CA 91007-3402
Phone (626) 898-8000

Hospital & facility affiliations

National Provider Directory

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

State licenses

LicenseStateTypeSpecialty
45103MAMDNephrology Physician

Practice roles

OrganizationSpecialtyStatusNew patients
Joslin Clinic Inc CurrentSince Jan 1, 2007 Accepting new patients
Harvard Medical Faculty Phys at Beth Israel Deaconess Med Ctr Inc CurrentSince Nov 9, 2011 Accepting new patients
Beth Israel Deaconess Medical Center, Inc. CurrentSince Nov 9, 2011 Accepting new patients
Usc Care Medical Group, Inc CurrentSince Jul 1, 2025 Accepting new patients
Usc Care Medical Non-Contracted LLC Nephrology CurrentSince Jul 1, 2025 Accepting new patients
Usc Care Medical Group, Inc CurrentSince Jul 1, 2025 Accepting new patients
Harvard Medical Faculty Phys at Beth Israel Deaconess Med Ctr Inc CurrentSince Nov 9, 2011 Accepting new patients
Beth Israel Deaconess Medical Center, Inc. CurrentSince Nov 9, 2011 Accepting new patients

Locations

300 W Huntington Dr
Arcadia, CA 91007
Phone (626) 445-4441

420 34th St
Bakersfield, CA 93301
Phone (661) 324-4647

1500 San Pablo St
Los Angeles, CA 90033
Phone (323) 443-8500

1520 San Pablo St
Fl 4
Los Angeles, CA 90033
Phone (323) 442-5849

1516 San Pablo St
Los Angeles, CA 90033
Phone (323) 276-3705

1441 Eastlake Ave
Los Angeles, CA 90089
Phone (323) 865-3000

2310 Alcazar St
Los Angeles, CA 90033
Phone (323) 441-9966

1520 San Pablo St
Los Angeles, CA 90033
Phone (323) 442-5849

1 Joslin Pl
Boston, MA 02215
Phone (617) 309-2400

330 Brookline Ave
Boston, MA 02215
Phone (617) 667-2000

1200 Centre St
Roslindale, MA 02131
Phone (617) 363-8000

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 5

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": "1151884800000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1303689600000",
    "number": "1184653891",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "31 HEREFORD ST",
            "city": "BOSTON",
            "state": "MA",
            "postal_code": "021151718",
            "telephone_number": "617-267-5652",
            "fax_number": "617-735-1916"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1 JOSLIN PL",
            "city": "BOSTON",
            "state": "MA",
            "postal_code": "022155306",
            "telephone_number": "617-732-2477",
            "fax_number": "617-732-2467"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "WILLIAMS",
        "first_name": "MARK",
        "middle_name": "E",
        "name_prefix": "Dr.",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2006-07-03",
        "last_updated": "2011-04-25",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "174400000X",
            "taxonomy_group": "",
            "desc": "Specialist",
            "state": "MA",
            "license": "45103",
            "primary": false
        },
        {
            "code": "207RN0300X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Nephrology",
            "state": "MA",
            "license": "45103",
            "primary": true
        }
    ],
    "identifiers": [
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "0112542",
            "state": "MA"
        }
    ],
    "endpoints": [],
    "other_names": []
}

Other providers in Boston, MA

Sources for this page

Verify at the official NPI Registry.