Edmund Co Yao, M.D.
Internal Medicine Physician · Stockton, CA
Edmund Co Yao, M.D. is an internal medicine physician with a practice address in Stockton, California, and NPI 1245328004, issued on Oct 10, 2006. Check the license (California A84312, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Edmund Co Yao
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A84312 CA
Self-reported in NPPES; status is on the state search - Practice location
- 3031 W March LN Ste 101, Stockton, CA 95219
- Phone
- (209) 472-7100
- Enumerated
- Oct 10, 2006
- Record last updated
- Dec 30, 2019 (not updated in 7 years: call before relying on the address or phone)
- Fax
- (209) 472-7108
- Medicaid ID
- 00A843120 CA
- Medicare enrollment
- Enrolled (PECOS I20041116001246); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 3031 W March LN Ste 101
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Adeline Domkam, FNPFamily Nurse Practitioner1609521301
Verify Edmund Co Yao in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A84312Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
11.9 times the Medicare Part D claims of the average internal medicine physician in 2024
37,834 Medicare Part D claims for 1,320 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 15% of claims. 928 claims were for opioids.
Most prescribed
- Levothyroxine Sodium1,941 claims
- Atorvastatin Calcium1,921 claims
- Losartan Potassium1,316 claims
- Amlodipine Besylate1,261 claims
- Omeprazole1,150 claims
- Pantoprazole Sodium983 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: $106.09
6 payments; by number, the most common kind was food and beverage; the largest payer was Janssen Pharmaceuticals, Inc. The 50,334 providers of this specialty with any payment received $1,303.06 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.
Bills Medicare through one group practice
- Inpatient Specialists OF California PCStockton, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Edmund Co Yao among 17,696 internal medicine physician records in California
Edmund Co Yao, M.D. is one of 17,696 internal medicine physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 5% of them.
- NPI issued2006 · 5% of these records are older, 56% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated1991 · median 2004 among the 11,065 with a school on file
- Record last updated2019 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
89 internal medicine physician records list a practice address in Stockton
They are 89 of the 9,522 NPPES records with a practice address in Stockton, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Stockton → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Rakesh Baboo, MD, MBBSStockton, CA 952191083190839
- Alexander Chan, M.D.Stockton, CA 952191386722296
- Alfredo Leon, M.D.Stockton, CA 952191497791214
- Gursharan Nahl, MDStockton, CA 952191437117322
- Amin Seyedkazemi, DOStockton, CA 952191124550595
- Laura Jones, MD, MSAngels Camp, CA 952221366063661
- Shien Tseng, M.D.Stockton, CA 952151639388325
- Lorna Agoo, MDStockton, CA 952101831241637
Common questions
What is Edmund Co Yao, M.D.'s NPI number?
Edmund Co Yao, M.D.'s National Provider Identifier (NPI) is 1245328004, issued on Oct 10, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Edmund Co Yao, M.D. located?
The NPPES record lists a practice address at 3031 W March LN Ste 101, Stockton, CA, 95219. Phone: (209) 472-7100. Providers update this record themselves, so call before visiting.
How can I verify Edmund Co Yao, M.D.'s license?
NPPES lists California license number A84312, 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 Edmund Co Yao, M.D. prescribe under Medicare Part D?
In 2024, Edmund Co Yao, M.D. had 37,834 Medicare Part D claims for 1,320 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.