James Florencio Dec Tamesis, M.D.
Internal Medicine Physician · Roseville, CA
James Florencio Dec Tamesis, M.D. is an internal medicine physician with a practice address in Roseville, California, and NPI 1568819050, issued on May 16, 2016. Check the license (California A172259, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- James Florencio Dec Tamesis
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A172259 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2050 Blue Oaks Blvd, Roseville, CA 95747
- Phone
- (916) 910-2400
- Enumerated
- May 16, 2016
- Record last updated
- Aug 6, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (916) 910-2355
- Medicare enrollment
- Enrolled (PECOS I20210812003260); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
Also registered at 2050 Blue Oaks Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify James Florencio Dec Tamesis in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A172259Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.7 times the Medicare Part D claims of the average internal medicine physician in 2024
8,514 Medicare Part D claims for 599 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 12% of claims. 468 claims were for opioids.
Most prescribed
- Atorvastatin Calcium441 claims
- Levothyroxine Sodium306 claims
- Losartan Potassium284 claims
- Amlodipine Besylate239 claims
- Lisinopril198 claims
- Gabapentin193 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 one group practice
- Sutter Valley Medical FoundationRoseville, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
157 internal medicine physician records list a practice address in Roseville
They are 157 of the 5,340 NPPES records with a practice address in Roseville, and 17,696 internal medicine physician records in California.
All 157 in Roseville → All 17,696 in California → Every provider in Roseville →
Other internal medicine physician records in California
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- Samuel Abarte, M.D.Chula Vista, CA1578535498
- Alexander Abary, MDLong Beach, CA1104995919
- Luba Abascal, MDSan Francisco, CA1023180874
- Michael Abate, MDSacramento, CA1548248131
- Wali Abawi, D.O.Joshua Tree, CA1104362268
Common questions
What is James Florencio Dec Tamesis, M.D.'s NPI number?
James Florencio Dec Tamesis, M.D.'s National Provider Identifier (NPI) is 1568819050, issued on May 16, 2016. An NPI identifies a provider in billing; it is not a license.
Where is James Florencio Dec Tamesis, M.D. located?
The NPPES record lists a practice address at 2050 Blue Oaks Blvd, Roseville, CA, 95747. Phone: (916) 910-2400. Providers update this record themselves, so call before visiting.
How can I verify James Florencio Dec Tamesis, M.D.'s license?
NPPES lists California license number A172259, 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 James Florencio Dec Tamesis, M.D. prescribe under Medicare Part D?
In 2024, James Florencio Dec Tamesis, M.D. had 8,514 Medicare Part D claims for 599 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.