Tamara O'Nan, PA-C
Physician Assistant · Newport Beach, CA
Tamara O'Nan, PA-C is a physician assistant with a practice address in Newport Beach, California, and NPI 1477837862, issued on Oct 4, 2011. Check the license (California PA21869, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Tamara O'Nan
- Credential
- PA-C
- Primary taxonomy
- Physician Assistant 363A00000X
- License number
- PA21869 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1401 Dove St Ste 420, Newport Beach, CA 92660
- Phone
- (949) 945-0927
- Enumerated
- Oct 4, 2011
- Record last updated
- Mar 12, 2025
- Fax
- (949) 269-6263
- Entity
- Type 1 · individual
8 nearest physician assistant records → All 14,451 in California → Look up another NPI →
Also registered at 1401 Dove St Ste 420
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Tamara O'Nan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license PA21869Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
22% more Medicare Part D claims than the average physician assistant in 2024
1,016 Medicare Part D claims for 65 beneficiaries, against an average of 830 among the 101,058 providers of this specialty who prescribed in Part D. Brand-name drugs were 7% of claims.
Most prescribed
- Quetiapine Fumarate93 claims
- Clonazepam92 claims
- Lamotrigine74 claims
- Duloxetine Hcl41 claims
- Lurasidone Hcl37 claims
- Trazodone Hcl37 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $3,624.06
176 payments; by number, the most common kind was food and beverage; the largest payer was Iti, Inc. (d/b/a Intra-Cellular Therapies, Inc.). The 64,719 providers of this specialty with any payment received $841.65 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Tamara O'Nan among 14,451 physician assistant records in California
Tamara O'Nan, PA-C is one of 14,451 physician assistant records with a practice address in California. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2011, is newer than 30% of them.
- NPI issued2011 · 30% of these records are older, 67% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileNo · 50% of these records are
- Record last updated2025 · 40% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363A00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
145 physician assistant records list a practice address in Newport Beach
They are 145 of the 4,414 NPPES records with a practice address in Newport Beach, and 14,451 physician assistant records in California.
All 14,451 in California → Every provider in Newport Beach → Physician Assistant nationwide →
The 8 physician assistant records with the nearest ZIP codes
- Holly Beardsley, PA-CNewport Beach, CA 926601558514612
- Michael P Blasko, PANewport Beach, CA 926601124100300
- Brenda Bushey, PA-CNewport Beach, CA 926601700827664
- Michael Cordia, PA-CNewport Beach, CA 926601659563369
- Tamara Cordia, PA-CNewport Beach, CA 926601215185921
- Sally Decastro-Tilsen, P.A.Newport Beach, CA 926601023282019
- Sanaz Demehry, PANewport Beach, CA 926601679625024
- Karri Knodel, MPAS, MS, PA-C, ATCNewport Beach, CA 926601124232160
Common questions
What is Tamara O'Nan, PA-C's NPI number?
Tamara O'Nan, PA-C's National Provider Identifier (NPI) is 1477837862, issued on Oct 4, 2011. An NPI identifies a provider in billing; it is not a license.
Where is Tamara O'Nan, PA-C located?
The NPPES record lists a practice address at 1401 Dove St Ste 420, Newport Beach, CA, 92660. Phone: (949) 945-0927. Providers update this record themselves, so call before visiting.
How can I verify Tamara O'Nan, PA-C's license?
NPPES lists California license number PA21869, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Tamara O'Nan, PA-C prescribe under Medicare Part D?
In 2024, Tamara O'Nan, PA-C had 1,016 Medicare Part D claims for 65 beneficiaries; the average among physician assistant prescribers was 830. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.