Edwin T. Tseng, M.D.
Specialist · Thousand Oaks, CA
Edwin T. Tseng, M.D. is a specialist with a practice address in Thousand Oaks, California, and NPI 1609897271, issued on Jul 21, 2006. Check the license (California A35161, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Edwin T. Tseng
- Credential
- M.D.
- Primary taxonomy
- Specialist 174400000X
- License number
- A35161 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2220 Lynn RD, Thousand Oaks, CA 91360
- Phone
- (805) 469-8103
- Enumerated
- Jul 21, 2006
- Record last updated
- Jan 22, 2009 (not updated in 17 years: call before relying on the address or phone)
- Fax
- (805) 496-9661
- Medicare enrollment
- Enrolled (PECOS I20090120000264); may accept Medicare assignment
- Entity
- Type 1 · individual
8 nearest specialist records → All 5,749 in California → Look up another NPI →
Also registered at 2220 Lynn RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Amy Carter, FNP-CFamily Nurse Practitioner1316550452
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- Joy Edwards-Beckett, PHD, DNSC, FNP.C, CWFamily Nurse Practitioner1093838583
Verify Edwin T. Tseng in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license A35161Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
21% fewer Medicare Part D claims than the average specialist in 2024
1,086 Medicare Part D claims for 375 beneficiaries, against an average of 1,380 among the 8,233 providers of this specialty who prescribed in Part D. Brand-name drugs were 3% of claims.
Most prescribed
- Ipratropium Bromide135 claims
- Fluticasone Propionate132 claims
- Amoxicillin-Clavulanate Potass117 claims
- Azelastine Hcl109 claims
- Methylprednisolone90 claims
- Cefuroxime83 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.
The MIPS final score for 2023 (Medicare payment program): 0 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Edwin T. Tseng among 5,749 specialist records in California
Edwin T. Tseng, M.D. is one of 5,749 specialist records with a practice address in California. 30% 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 7% of them.
- NPI issued2006 · 7% of these records are older, 60% newer
- In a Medicare fileYes · 30% of these records are
- In the CMS Doctors and Clinicians fileYes · 19% of these records are
- Graduated1971 · median 1989 among the 1,075 with a school on file
- Record last updated2009 · 77% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 174400000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
25 specialist records list a practice address in Thousand Oaks
They are 25 of the 2,434 NPPES records with a practice address in Thousand Oaks, and 5,749 specialist records in California.
All 5,749 in California → Every provider in Thousand Oaks → Specialist nationwide →
The 8 specialist records with the nearest ZIP codes
- Miriam De Lyon, M.D.Thousand Oaks, CA 913601952430431
- Jeffrey Feinfield, M.D.Thousand Oaks, CA 913601740372028
- Alister George, M.D.Thousand Oaks, CA 913601821280629
- Michael Gollub, M.D.Thousand Oaks, CA 913601881723351
- Vrej GrigorianThousand Oaks, CA 913601972708840
- Anne HannickThousand Oaks, CA 913601851073563
- Melissa Johns, PTThousand Oaks, CA 913601881606317
- Jesse LeeThousand Oaks, CA 913601780248062
Common questions
What is Edwin T. Tseng, M.D.'s NPI number?
Edwin T. Tseng, M.D.'s National Provider Identifier (NPI) is 1609897271, issued on Jul 21, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Edwin T. Tseng, M.D. located?
The NPPES record lists a practice address at 2220 Lynn RD, Thousand Oaks, CA, 91360. Phone: (805) 469-8103. Providers update this record themselves, so call before visiting.
How can I verify Edwin T. Tseng, M.D.'s license?
NPPES lists California license number A35161, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Edwin T. Tseng, M.D. prescribe under Medicare Part D?
In 2024, Edwin T. Tseng, M.D. had 1,086 Medicare Part D claims for 375 beneficiaries; the average among specialist prescribers was 1,380. Part D covers Medicare prescriptions only.
What is Edwin T. Tseng, M.D.'s MIPS final score?
The 2023 MIPS final score is 0 of 100. The average among 454,083 clinicians with a measured score was 83.5.
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.