Tamara O'Nan, PA-C
NPI 1477837862 · Physician Assistant · Newport Beach, CA
Enrolled with Medicare as Practitioner - Physician Assistant · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Tamara O'Nan, PA-C is a Physician Assistant provider in Newport Beach, CA (NPI 1477837862).
Provider details
- NPI number
- 1477837862
- Entity type
- Individual
- Primary specialty
- Physician AssistantPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- PA-C
- Sex
- Female
- Sole proprietor
- No
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
- Physician Assistant363A00000X
Physician Assistants & Advanced Practice Nursing Providers
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
14 yrs in NPPES registry
- Profile completeness33% of score
83% of core fields populated
- Practice footprint20% of score
2 documented practice locations
- 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.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 29 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Quetiapine Fumarate | 93 | 14 |
| Clonazepam | 92 | 15 |
| Lamotrigine | 74 | 14 |
| Duloxetine Hcl | 41 | — |
| Trazodone Hcl | 37 | — |
| Lurasidone Hcl | 37 | — |
| Dextroamphetamine/Amphetaminebrand: Dextroamphetamine-Amphetamine |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$3,624 across 176 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
Additional practice locations (1)
- 1190 W. Baker StSte 100Costa Mesa, CA 92626-4105Phone: (714) 668-2500Fax: (714) 668-2515
Registry dates
- Enumerated
- 2011-10-04
- Last updated
- 2025-03-12
- Certified
- 2025-03-12
Frequently asked questions
- What is Tamara O'Nan's NPI number?
- Tamara O'Nan's National Provider Identifier (NPI) is 1477837862, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Tamara O'Nan's specialty?
- Tamara O'Nan is listed in the NPPES registry with a primary specialty of Physician Assistant (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Tamara O'Nan located?
- Tamara O'Nan's practice location on file with NPPES is 1401 Dove St Ste 420, Newport Beach, CA 92660-2420.
- What is Tamara O'Nan's phone number?
- The practice phone number listed in the NPPES registry for Tamara O'Nan is (949) 945-0927.
- Does Tamara O'Nan accept Medicare?
- Tamara O'Nan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Tamara O'Nan's NPI active?
- Yes — Tamara O'Nan's NPI (1477837862) is active in the NPPES registry as of the last update on 2025-03-12.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.