Ronald Mark Tilsen, M.D.

Primary specialty

Internal Medicine PhysicianTaxonomy code 207R00000X

License

G34508 Issued in CA

Practice address

400 Newport Center Dr
Suite 608
Newport Beach, CA 92660-7601

Phone

(949) 644-3559

Fax

(949) 718-6729

NPI assigned

Apr 25, 2006

Last updated

Jul 13, 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

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

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: ronaldtilsen@ncmgnb.allscriptsdirect.net

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.

• Newport Center Medical Group

  • Endocrinology, Diabetes & Metabolism Physician
  • Newport Beach, CA
  • NPI 1467478008
  Medicare reassignment NPD Authorized official
• UC Regents

  dba UCI Department of Medicine

  • Infectious Disease Physician
  • Orange, CA
  • NPI 1760430847
  Medicare reassignment NPD
• UC Regents

  dba UCI Department of Medicine

  • Internal Medicine Physician
  • Orange, CA
  • NPI 1205884392
  NPD
• UC Regents

  dba UCI Department of Medicine

  • Pulmonary Disease Physician
  • Orange, CA
  • NPI 1629026729
  NPD
• MD Solutions Medical Corp

  dba Unified Health care Inc.

  • Dermatology Physician
  • Sherman Oaks, CA
  • NPI 1902837735
  NPD (past)
• Riamd Inc

  • General Acute Care Hospital
  • Newport Beach, CA
  • NPI 1982980306
  NPD (past)

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

{
    "created_epoch": "1145923200000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1783900800000",
    "number": "1801852280",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "400 NEWPORT CENTER DR",
            "address_2": "SUITE 608",
            "city": "NEWPORT BEACH",
            "state": "CA",
            "postal_code": "926607601",
            "telephone_number": "949-644-3559",
            "fax_number": "949-718-6729"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "400 NEWPORT CENTER DR",
            "address_2": "SUITE 608",
            "city": "NEWPORT BEACH",
            "state": "CA",
            "postal_code": "926607601",
            "telephone_number": "949-644-3559",
            "fax_number": "949-718-6729"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "TILSEN",
        "first_name": "RONALD",
        "middle_name": "MARK",
        "name_prefix": "Dr.",
        "credential": "M.D.",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2006-04-25",
        "last_updated": "2026-07-13",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "CA",
            "license": "G34508",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

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• Internal Medicine Physician in Newport Beach, CA
• Providers in Newport Beach, 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 Jul 13, 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.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.