Ernest Okwuonu, M.D.
Psychiatry Physician · Palo Alto, CA
Ernest Okwuonu, M.D. is a psychiatry physician with a practice address in Palo Alto, California, and NPI 1639735665, issued on May 15, 2019. Check the license (California A185688, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Ernest Okwuonu
- Credential
- M.D.
- Primary taxonomy
- Psychiatry Physician 2084P0800X
- License numbers
- A185688 CA
MD61551380 WA
Self-reported in NPPES; status is on the state search - Practice location
- 500 Pasteur Dr, Palo Alto, CA 94304
- Phone
- (650) 723-0895
- Enumerated
- May 15, 2019
- Record last updated
- Mar 17, 2025
- Medicare enrollment
- Enrolled (PECOS I20240117004838); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
Also registered at 500 Pasteur Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Ernest Okwuonu in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A185688Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
89% fewer Medicare Part D claims than the average psychiatry physician in 2024
110 Medicare Part D claims for 16 beneficiaries, against an average of 1,000 among the 35,054 providers of this specialty who prescribed in Part D.
Most prescribed
- Duloxetine Hcl32 claims
- Escitalopram Oxalate14 claims
- Pregabalin12 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.
Bills Medicare through 2 group practices
- Asana Integrated Medical Group PCSanta Rosa, CA
- Comprehensive Psychiatric Services A Medical GroupEncino, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
215 psychiatry physician records list a practice address in Palo Alto
They are 215 of the 7,617 NPPES records with a practice address in Palo Alto, and 8,673 psychiatry physician records in California.
All 215 in Palo Alto → All 8,673 in California → Every provider in Palo Alto →
Other psychiatry physician records in California
- Nancy Aaen, MDNapa, CA1609816669
- Criselda Abad-Santos, M.D.Woodland Hills, CA1760461826
- Mekabiz Abaian, MDSan Bernardino, CA1891090163
- Brenda Abarca, MDTorrance, CA1407485527
- Pilar Abascal, M.D.Los Angeles, CA1730528191
- Michele Abbasi, M.D.Westlake Village, CA1093940330
- Zohaib AbbasiMartinez, CA1013392224
- Sandy Abdelkedous, MDFresno, CA1306093109
- Nancy Abdelmalak, M.D.Elk Grove, CA1912137498
- Ezzat Abdelmalek, M.DDana Point, CA1992828826
Common questions
What is Ernest Okwuonu, M.D.'s NPI number?
Ernest Okwuonu, M.D.'s National Provider Identifier (NPI) is 1639735665, issued on May 15, 2019. An NPI identifies a provider in billing; it is not a license.
Where is Ernest Okwuonu, M.D. located?
The NPPES record lists a practice address at 500 Pasteur Dr, Palo Alto, CA, 94304. Phone: (650) 723-0895. Providers update this record themselves, so call before visiting.
How can I verify Ernest Okwuonu, M.D.'s license?
NPPES lists California license number A185688, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Ernest Okwuonu, M.D. prescribe under Medicare Part D?
In 2024, Ernest Okwuonu, M.D. had 110 Medicare Part D claims for 16 beneficiaries; the average among psychiatry physician prescribers was 1,000. 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.