Siamak N Nabili, M.D.

Primary specialty

Hospitalist PhysicianTaxonomy code 208M00000X

License

A83984 Issued in CA

Practice address

11 Technology Dr
Irvine, CA 92618-2302

Phone

(855) 206-6764

Fax

(949) 923-3575

NPI assigned

Jun 20, 2006

Last updated

Aug 5, 2025By 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 2

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

Specialty

Internal Medicine

Education

Other, 2001

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Nili N. Alai, MD, Inc.Group PAC ID 0648222646, 3 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Vitas Healthcare Corporation of California Hospice, Riverside, CA, CCN 051590
• Beacon of Hope Hospice Hospice, Laughlin, NV, CCN 291623

Procedures performed for Medicare patients

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

Networks

• BSC 65 PLUS INDIVIDUAL MAPD

Interoperability endpoints

• Direct secure messaging: siamak.nabili.p7@direct.monarchhealthcare.nextgenshare.com
• Direct secure messaging: siamaknabili@clchc.allscriptsdirect.net

All facility ownership & control disclosures 1

Facilities whose Medicare enrollment lists this provider’s PECOS associate ID as an owner or managing party.

Owned or controlled facilities with NPI records 1

Facilities whose Medicare enrollment lists this provider as an owner, officer, director or managing party.

• Vitas Healthcare Corporation of California

  • Community Based Hospice Care Agency
  • Riverside, CA
  • NPI 1790828804

  W-2 Managing Employee

  CMS ownership

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.

• Nili N. Alai, MD, Inc.

  • Specialist
  • Laguna Hills, CA
  • NPI 1952590135
  Medicare reassignment Care Compare group NPD
• Celebrating Life Community Health Center

  • Federally Qualified Health Center (FQHC)
  • Mission Viejo, CA
  • NPI 1386273100
  Medicare reassignment NPD
• Centers for Family Medicine GP

  dba Optumcare Medical Group

  • Family Medicine Physician
  • Los Alamitos, CA
  • NPI 1467598243

  Internal Medicine

  Medicare reassignment NPD
• Healthcare Partners Affiliates Medical Group

  dba Optum

  • Internal Medicine Physician
  • Los Angeles, CA
  • NPI 1659312593
  Medicare reassignment NPD
• Siamak Nabili, M.D., Inc.

  • Specialist
  • Laguna Hills, CA
  • NPI 1568408425

  Internal Medicine

  NPD (past) Authorized official
• Beaver Medical Group P C

  dba Optum

  • Family Medicine Physician
  • Redlands, CA
  • NPI 1649503319

  Internal Medicine

  NPD
• Cassidy Medical Group Inc.

  • Multi-Specialty Clinic/Center
  • Vista, CA
  • NPI 1215003470
  NPD
• Celebrating Life Community Health Center

  • Federally Qualified Health Center (FQHC)
  • Irvine, CA
  • NPI 1558068098
  NPD
• Healthcare Partners Affiliates Medical Group

  dba Optum

  • Durable Medical Equipment & Medical Supplies
  • Murrieta, CA
  • NPI 1760057269
  NPD
• Hospice Care of America, LLC

  dba Compassus - Orange County

  • Community Based Hospice Care Agency
  • Orange, CA
  • NPI 1134226038
  NPD (past)
• Hospice Care of America, LLC

  dba Compassu s- Los Angeles

  • Community Based Hospice Care Agency
  • Glendale, CA
  • NPI 1851471148
  NPD (past)
• Inpatient Consultants of California, Inc

  • Internal Medicine Physician
  • Riverside, CA
  • NPI 1992189286
  NPD (past)

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

• Vitas Healthcare Corporation of California

  • Community Based Hospice Care Agency
  • Riverside, CA
  • NPI 1790828804
  Care Compare affiliation
• Hospice of Laughlin LLC

  dba Beacon of Hope Hospice

  • Community Based Hospice Care Agency
  • Laughlin, NV
  • NPI 1043885908
  Care Compare affiliation

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

{
    "created_epoch": "1150761600000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1754352000000",
    "number": "1407892490",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "PO BOX 35380",
            "city": "LAS VEGAS",
            "state": "NV",
            "postal_code": "891335380"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "11 TECHNOLOGY DR",
            "city": "IRVINE",
            "state": "CA",
            "postal_code": "926182302",
            "telephone_number": "855-206-6764",
            "fax_number": "949-923-3575"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "NABILI",
        "first_name": "SIAMAK",
        "middle_name": "N",
        "name_prefix": "Dr.",
        "credential": "M.D.",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2006-06-20",
        "last_updated": "2025-08-05",
        "certification_date": "2025-08-05",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "CA",
            "license": "A83984",
            "primary": false
        },
        {
            "code": "208M00000X",
            "taxonomy_group": "",
            "desc": "Hospitalist",
            "state": "CA",
            "license": "A83984",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Charisma Mylavarapu, D.O.
• Anna Marta Myran, LMFT
• Syed Sami N Zafar Ahmed
• Jin Ju NA, PHARM D
• Kayla Noel Nabers
• Ana Karen Nabor Macedonio, BEHAVIORAL TECH
• Miriam Nabor Macedonio
• Farnoosh Nadalizadeh, PA-C
• Evangeline Marzan Nadeau, FNP-BC
• Ronald Nadelberg

• Hospitalist Physician in Irvine, CA
• Providers in Irvine, CA by specialty
• Hospitalist Physician in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Aug 5, 2025; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; facility enrollments, owners and changes of ownership; Provider of Services certification data; 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.