Gregory Siaumau, PMHNP

Primary specialty

Psychiatric/Mental Health Nurse PractitionerTaxonomy code 363LP0808X

License

NP95031610 Issued in CA

Practice address

8770 Cuyamaca St Ste 4
Santee, CA 92071-4289

Phone

(619) 596-9890

NPI assigned

Nov 1, 2022

Sex

Male

Sole proprietor

Yes

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: No

Green means eligible to order or refer.

Enrollment records 1

Specialty

Nurse Practitioner

Education

Other, 2024

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Yashwant Chaudhri MD a Prof CorpGroup PAC ID 5597740126, 5 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Grossmont Hospital Hospital, La Mesa, CA, CCN 050026
• UC San Diego Health Hillcrest - Hillcrest Med Ctr Hospital, San Diego, CA, CCN 050025

Medicare enrollment (NPD)

Enrolled

Credentials

Nurse Practitioner

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 and National Provider Directory roles.

• Yashwant Chaudhri MD a Prof Corp

  dba California Medical Behavioral Health

  • Psychiatry Physician
  • Santee, CA
  • NPI 1881705127

  Single Specialty

  Medicare reassignment Care Compare group NPD
• R G Franklin Center LLC

  • Substance Abuse Rehabilitation Facility
  • Los Angeles, CA
  • NPI 1154047876
  NPD (past)

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

• Grossmont Hospital Corporation

  dba Sharp Grossmont Hospital

  • General Acute Care Hospital
  • La Mesa, CA
  • NPI 1528041811
  Care Compare affiliation
• Regents of the University of California

  dba UCSD Medical Center

  • General Acute Care Hospital
  • San Diego, CA
  • NPI 1184722779
  Care Compare affiliation

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

{
    "created_epoch": "1667260800000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1789084800000",
    "number": "1609583392",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "8770 CUYAMACA ST STE 4",
            "city": "SANTEE",
            "state": "CA",
            "postal_code": "920714289",
            "telephone_number": "619-596-9890"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "8770 CUYAMACA ST STE 4",
            "city": "SANTEE",
            "state": "CA",
            "postal_code": "920714289",
            "telephone_number": "619-596-9890"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "460 N Magnolia Ave Ste 110",
            "address_purpose": "LOCATION",
            "city": "El Cajon",
            "state": "CA",
            "postal_code": "920203610",
            "country_code": "US",
            "telephone_number": "619-440-5133",
            "fax_number": "619-440-8522",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "SIAUMAU",
        "first_name": "GREGORY",
        "credential": "PMHNP",
        "sole_proprietor": "YES",
        "sex": "M",
        "enumeration_date": "2022-11-01",
        "last_updated": "2026-09-11",
        "certification_date": "2026-09-11",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "363LP0808X",
            "taxonomy_group": "193400000X SINGLE SPECIALTY  GROUP",
            "desc": "Nurse Practitioner, Psychiatric/Mental Health",
            "state": "CA",
            "license": "NP95031610",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Kimberly Shathia, LPCC
• Abdisalam Shuriye Sheikh Mohamed
• Aaron Joseph Shirey Jr.
• Andrew Shorez
• Tong-an Shueh, PH.D.
• Ruth V Sigler, LCSW
• Flora Cruz Sison, RN
• SJC Management & Consulting Corp (Phillips Ranch Pharmacy)
• Jamie Lynn Skinner
• Jillaine Smasal-Kwak

• Psychiatric/Mental Health Nurse Practitioner in Santee, CA
• Providers in Santee, CA by specialty
• Psychiatric/Mental Health Nurse Practitioner in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Sep 11, 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.