James Stewart Lang, M.D.

Primary specialty

Internal Medicine PhysicianTaxonomy code 207R00000X

License

269504 Issued in MA

Practice address

151 Everett Ave
Chelsea, MA 02150-1807

Phone

(617) 889-8520

Fax

(617) 889-8571

NPI assigned

Apr 25, 2014

Sex

Male

Sole proprietor

No

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

Specialties & licenses 2

Addresses

Medicare fee-for-service enrollment

Enrolled in MA, WA2 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

Specialty

Internal Medicine

Education

Other, 2014

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Telehealth

Offers telehealth services

Group practices

Optum Care Washington PLLCGroup PAC ID 6406752153, 684 clinicians

The General Hospital CorporationGroup PAC ID 6507803806, 1,275 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Massachusetts General Hospital Hospital, Boston, MA, CCN 220071
• Providence Regional Medical Center Everett Hospital, Everett, WA, CCN 500014

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

Interoperability endpoints

• FHIR API: https://api.platform.athenahealth.com/3889/brand/1/csg/1/fhir/r4

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.

• The General Hospital Corporation

  • General Acute Care Hospital
  • Boston, MA
  • NPI 1023049236
  Medicare reassignment Care Compare group NPD
• Optum Care Washington PLLC

  • Multi-Specialty Clinic/Center
  • Everett, WA
  • NPI 1831186766

  Internal Medicine

  Medicare reassignment Care Compare group NPD
• Cambridge Public Health Commission

  • General Acute Care Hospital
  • Cambridge, MA
  • NPI 1932313228
  Medicare reassignment NPD
• Massachusetts General Physicians Organization Inc

  • Dermatology Physician
  • Boston, MA
  • NPI 1801874573

  Internal Medicine

  Medicare reassignment NPD
• The Polyclinic PLLC

  • Audiologist
  • Seattle, WA
  • NPI 1174594634

  Internal Medicine

  Medicare reassignment NPD
• Optum Care Washington PLLC

  • Durable Medical Equipment & Medical Supplies
  • Marysville, WA
  • NPI 1194428425

  Internal Medicine

  NPD
• Optum Care Washington PLLC

  • Ambulatory Surgical Clinic/Center
  • Arlington, WA
  • NPI 1366154304
  NPD
• The Polyclinic

  • Ambulatory Surgical Clinic/Center
  • Seattle, WA
  • NPI 1073944039
  NPD
• The Polyclinic PLLC

  • Durable Medical Equipment & Medical Supplies
  • Tacoma, WA
  • NPI 1831411487

  Internal Medicine

  NPD
• Optum Care Washington PLLC

  • Ambulatory Surgical Clinic/Center
  • Everett, WA
  • NPI 1154318103
  NPD (past)

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

• The General Hospital Corporation

  • General Acute Care Hospital
  • Boston, MA
  • NPI 1023049236
  Care Compare affiliation
• Providence Health & Services-Wa

  • Hospitalist Physician
  • Everett, WA
  • NPI 1649615220
  Care Compare affiliation
• Providence Health & Services-Wa

  • General Acute Care Hospital
  • Everett, WA
  • NPI 1700037801
  Care Compare affiliation

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

{
    "created_epoch": "1398384000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1760486400000",
    "number": "1528488798",
    "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": "151 EVERETT AVE",
            "city": "CHELSEA",
            "state": "MA",
            "postal_code": "021501807",
            "telephone_number": "617-889-8520",
            "fax_number": "617-889-8571"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "LANG",
        "first_name": "JAMES",
        "middle_name": "STEWART",
        "credential": "M.D.",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2014-04-25",
        "last_updated": "2025-10-15",
        "certification_date": "2025-10-15",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "MA",
            "license": "269504",
            "primary": true
        },
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "WA",
            "license": "MD61493634",
            "primary": false
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Guirlaine Laguerre
• Diana Lai-Tran, RPH
• Susan A Lambe, EDM
• Rebecca L Lambert, M.D.
• Katherine Landucci
• Lang'S Dental Center, LLC
• Eugene F Lawrence Sr., M.ED., CADC, LADC 1
• Patricia Fernanda Lazarte
• Jane Le
• Tamara J Leaf, PSYD

• Internal Medicine Physician in Chelsea, MA
• Providers in Chelsea, MA by specialty
• Internal Medicine Physician in Massachusetts

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Oct 15, 2025; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; Order and Referring.
• Medicare Care Compare (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.