David Kenneth Trefflich, MD
Internal Medicine Physician · Santa Maria, CA
David Kenneth Trefflich, MD is an internal medicine physician with a practice address in Santa Maria, California, and NPI 1861836942, issued on Apr 19, 2013. Check the license (California A170337, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- David Kenneth Trefflich
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A170337 CA
Self-reported in NPPES; status is on the state search - Practice location
- 430 S Blosser RD, Santa Maria, CA 93458
- Phone
- (805) 361-8900
- Enumerated
- Apr 19, 2013
- Record last updated
- Oct 28, 2020 (not updated in 6 years: call before relying on the address or phone)
- Fax
- (805) 361-8990
- Medicare enrollment
- Enrolled (PECOS I20201030000924); accepts Medicare assignment
- Medical or professional school
- University Of California, Irvine, California College Of Medicine, 2013
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 430 S Blosser RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify David Kenneth Trefflich in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A170337Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
14% more Medicare Part D claims than the average internal medicine physician in 2024
3,628 Medicare Part D claims for 282 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 17% of claims. 42 claims were for opioids.
Most prescribed
- Atorvastatin Calcium293 claims
- Amlodipine Besylate233 claims
- Lisinopril165 claims
- Metformin Hcl136 claims
- Omeprazole134 claims
- Gabapentin123 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: $76.73
4 payments; by number, the most common kind was food and beverage; the largest payer was Bayer Healthcare 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
- Community Health Centers OF The Central Coast IncSanta Maria, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
David Kenneth Trefflich among 17,696 internal medicine physician records in California
David Kenneth Trefflich, MD 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 2013, is newer than 71% of them.
- NPI issued2013 · 71% of these records are older, 26% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated2013 · median 2004 among the 11,065 with a school on file
- Record last updated2020 · 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).
Internal Medicine Physician providers in California
There are 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Santa Maria → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Gabriel Foo, M.D.Santa Maria, CA 934581306875539
- Victor Guerrero, MDSanta Maria, CA 934581972596963
- Paul Lussier, D.O.Santa Maria, CA 934581013949791
- Ijeoma Ofiaeli, M.D.Santa Maria, CA 934581932138179
- Joseph Yorke, M.D.Santa Maria, CA 934581811929516
- Maria Ramos, M.D.Santa Ynez, CA 934601538175864
- Jimmy Baker, MDSanta Maria, CA 934551912054487
- Sam Densen, MDSanta Maria, CA 934551881172666
Common questions
What is David Kenneth Trefflich, MD's NPI number?
David Kenneth Trefflich, MD's National Provider Identifier (NPI) is 1861836942, issued on Apr 19, 2013. An NPI identifies a provider in billing; it is not a license.
Where is David Kenneth Trefflich, MD located?
The NPPES record lists a practice address at 430 S Blosser RD, Santa Maria, CA, 93458. Phone: (805) 361-8900. Providers update this record themselves, so call before visiting.
How can I verify David Kenneth Trefflich, MD's license?
NPPES lists California license number A170337, 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 David Kenneth Trefflich, MD prescribe under Medicare Part D?
In 2024, David Kenneth Trefflich, MD had 3,628 Medicare Part D claims for 282 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.