David W. Ralston, M.D.
Internal Medicine Physician · San Luis Obispo, CA
David W. Ralston, M.D. is an internal medicine physician with a practice address in San Luis Obispo, California, and NPI 1861537565, issued on Feb 20, 2007. Check the license (California G32733, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- David W. Ralston
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- G32733 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1 Grand Ave, San Luis Obispo, CA 93407
- Phone
- (805) 756-1211
- Enumerated
- Feb 20, 2007
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (805) 756-5286
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 1 Grand Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify David W. Ralston in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G32733Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
99% fewer Medicare Part D claims than the average internal medicine physician in 2024
20 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 W. Ralston among 17,696 internal medicine physician records in California
David W. Ralston, 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 2007, is newer than 44% of them.
- NPI issued2007 · 44% of these records are older, 44% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 63% of these records are
- Record last updated2007 · 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).
41 internal medicine physician records list a practice address in San Luis Obispo
They are 41 of the 3,403 NPPES records with a practice address in San Luis Obispo, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in San Luis Obispo → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Barbara Bailey, M.D.San Luis Obispo, CA 934051184984825
- Gayle Cekada, M.DSan Luis Obispo, CA 934051114996055
- Frank Collie, MDSan Luis Obispo, CA 934051861496879
- Philippe Duhaime, M.DSan Luis Obispo, CA 934051043692866
- Bruce Faecher, M.D.San Luis Obispo, CA 934091336332402
- Karen Fong, MDSan Luis Obispo, CA 934051851396816
- Camilo Guiang, MDSan Luis Obispo, CA 934051881886935
- Stephen Hilty, M.D.San Luis Obispo, CA 934051205839818
Common questions
What is David W. Ralston, M.D.'s NPI number?
David W. Ralston, M.D.'s National Provider Identifier (NPI) is 1861537565, issued on Feb 20, 2007. An NPI identifies a provider in billing; it is not a license.
Where is David W. Ralston, M.D. located?
The NPPES record lists a practice address at 1 Grand Ave, San Luis Obispo, CA, 93407. Phone: (805) 756-1211. Providers update this record themselves, so call before visiting.
How can I verify David W. Ralston, M.D.'s license?
NPPES lists California license number G32733, 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 W. Ralston, M.D. prescribe under Medicare Part D?
In 2024, David W. Ralston, M.D. had 20 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.