Matthew Welzenbach, MD

Primary specialty

Internal Medicine PhysicianTaxonomy code 207R00000X

License

A161635 Issued in CA

Practice address

1520 San Pablo St Ste 1000
Los Angeles, CA 90033-5312

Phone

(323) 442-5100

NPI assigned

Mar 22, 2016

Last updated

Oct 1, 2026By the provider in NPPES

Sex

Male

Sole proprietor

No

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

Specialties & licenses 1

Addresses

Electronic endpoints 1

Medicare fee-for-service enrollment

Enrolled in CA

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 1

Specialty

Internal Medicine

Education

Other, 2016

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Southern California Permanente Medical GroupGroup PAC ID 6002729175, 11,250 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Kaiser Foundation Hospital - Los Angeles Hospital, Los Angeles, CA, CCN 050138

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

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

• Southern California Permanente Medical Group

  • Health Maintenance Organization
  • Baldwin Park, CA
  • NPI 1770515280
  Medicare reassignment Care Compare group NPD
• St. Johns Community Health

  • Federally Qualified Health Center (FQHC)
  • Los Angeles, CA
  • NPI 1073653630
  Medicare reassignment NPD
• Southern California Permanente Medical Group

  • Health Maintenance Organization
  • Los Angeles, CA
  • NPI 1013409044
  NPD
• Southern California Permanente Medical Group

  • Health Maintenance Organization
  • Santa Clarita, CA
  • NPI 1316409410
  NPD
• St. Johns Community Health

  • Community Health Clinic/Center
  • Los Angeles, CA
  • NPI 1073363768
  NPD
• St. Johns Community Health

  • Federally Qualified Health Center (FQHC)
  • Los Angeles, CA
  • NPI 1396981700
  NPD
• St. Johns Community Health

  • Federally Qualified Health Center (FQHC)
  • San Bernardino, CA
  • NPI 1780376947
  NPD (past)

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

• Kaiser Foundation Hospitals

  dba Kaiser Foundation Hospital-Los Angeles

  • General Acute Care Hospital
  • Los Angeles, CA
  • NPI 1821143777
  Care Compare affiliation

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

{
    "created_epoch": "1458604800000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1790812800000",
    "number": "1386006088",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "PO BOX 50938",
            "city": "LOS ANGELES",
            "state": "CA",
            "postal_code": "900740938",
            "telephone_number": "323-442-5100"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1520 SAN PABLO ST STE 1000",
            "city": "LOS ANGELES",
            "state": "CA",
            "postal_code": "900335312",
            "telephone_number": "323-442-5100"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "WELZENBACH",
        "first_name": "MATTHEW",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2016-03-22",
        "last_updated": "2026-10-01",
        "certification_date": "2026-10-01",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "CA",
            "license": "A161635",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [
        {
            "endpointType": "SOAP",
            "endpointTypeDescription": "SOAP URL",
            "endpoint": "https://careepicwest.kp.org:14430/Interconnect-prodcalgateway/wcf/epic.community.hie/xcpdrespondinggatewaysync.svc/scalceq",
            "affiliation": "Y",
            "endpointDescription": "Carequality",
            "affiliationName": "Southern California Permanente Medical Group",
            "use": "HIE",
            "useDescription": "Health Information Exchange (HIE)",
            "contentType": "OTHER",
            "contentTypeDescription": "Other",
            "contentOtherDescription": "C-CDA",
            "address_1": "4733 W Sunset Blvd",
            "city": "Los Angeles",
            "state": "CA",
            "country_code": "US",
            "postal_code": "900276021",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "other_names": []
}

• Winfield J Wells, MD
• Chloe Welmond
• Caitlin Welsh
• Sheila Vahningle Welsh, LCSW
• Daniel Weltsch, MD
• Wen Sheng Wang Dental Corporation (West Coast Dental Group of 6TH Street)
• Shirley Sheung-Lin Wen
• Shumin Wen, DDS
• Tyler Christopher Wen
• Yu-Ching Eugenia Wen, M.D.

• Internal Medicine Physician in Los Angeles, CA
• Providers in Los Angeles, CA by specialty
• Internal Medicine Physician in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Oct 1, 2026; 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.