Gregory Siaumau, PMHNP
NPI 1609583392 · Psychiatric/Mental Health Nurse Practitioner · Santee, CA
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gregory Siaumau, PMHNP is a Psychiatric/Mental Health Nurse Practitioner provider in Santee, CA (NPI 1609583392).
Provider details
- NPI number
- 1609583392
- Entity type
- Individual
- Primary specialty
- Psychiatric/Mental Health Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- PMHNP
- Sex
- Male
- Sole proprietor
- Yes
- License
- NP95031610 (CA)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure33% of score
3 yrs in NPPES registry
- Profile completeness33% of score
100% of core fields populated
- Practice footprint20% of score
1 documented practice location
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$391 across 4 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2022-11-01
- Last updated
- 2024-09-30
- Certified
- 2024-09-30
Frequently asked questions
- What is Gregory Siaumau's NPI number?
- Gregory Siaumau's National Provider Identifier (NPI) is 1609583392, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gregory Siaumau's specialty?
- Gregory Siaumau is listed in the NPPES registry with a primary specialty of Psychiatric/Mental Health Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Gregory Siaumau located?
- Gregory Siaumau's practice location on file with NPPES is 8770 Cuyamaca St Ste 4, Santee, CA 92071-4289.
- What is Gregory Siaumau's phone number?
- The practice phone number listed in the NPPES registry for Gregory Siaumau is (619) 596-9890.
- Does Gregory Siaumau accept Medicare?
- Gregory Siaumau is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gregory Siaumau's NPI active?
- Yes — Gregory Siaumau's NPI (1609583392) is active in the NPPES registry as of the last update on 2024-09-30.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.