David Siegel, M.D.
Internal Medicine Physician · Mather, CA
David Siegel, M.D. is an internal medicine physician with a practice address in Mather, California, and NPI 1023092590, issued on Nov 30, 2005. Check the license (California G39933, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- David Siegel
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- G39933 CA
Self-reported in NPPES; status is on the state search - Practice location
- 10535 Hospital Way, Mather, CA 95655
- Phone
- (916) 843-7096
- Enumerated
- Nov 30, 2005
- Record last updated
- Jul 13, 2026
- Fax
- (916) 366-5475
- Entity
- Type 1 · individual
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Verify David Siegel in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G39933Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
100% fewer Medicare Part D claims than the average internal medicine physician in 2024
12 Medicare Part D claims, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
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.
David Siegel among 17,696 internal medicine physician records in California
David Siegel, 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 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 95% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 63% of these records are
- Record last updated2026 · 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).
26 internal medicine physician records list a practice address in Mather
They are 26 of the 398 NPPES records with a practice address in Mather, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Mather → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Sheldon Ball, MDMather, CA 956551689646275
- Patrick Chang, MDMather, CA 956551861467656
- Stephen Drogin, M.D.Carmichael Ca, CA 956551891710315
- Philip Eulie, M.D.Mather, CA 956551669455762
- Clifford Fisher, MDMather, CA 956551063495687
- Dorothea Hoover, MDMather, CA 956551609802800
- Rajasekar Jagadeesan, M.D.Mather, CA 956551790967586
- Jaeho Lee, M.D.Mather, CA 956551578547048
Common questions
What is David Siegel, M.D.'s NPI number?
David Siegel, M.D.'s National Provider Identifier (NPI) is 1023092590, issued on Nov 30, 2005. An NPI identifies a provider in billing; it is not a license.
Where is David Siegel, M.D. located?
The NPPES record lists a practice address at 10535 Hospital Way, Mather, CA, 95655. Phone: (916) 843-7096. Providers update this record themselves, so call before visiting.
How can I verify David Siegel, M.D.'s license?
NPPES lists California license number G39933, 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 Siegel, M.D. prescribe under Medicare Part D?
In 2024, David Siegel, M.D. had 12 Medicare Part D claims; 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.