Ralph E. Koldinger, M.D.
Gastroenterology Physician · Sacramento, CA
Ralph E. Koldinger, M.D. is a gastroenterology physician with a practice address in Sacramento, California, and NPI 1952421703, issued on Mar 29, 2007. Check the license (California G9968, as entered in NPPES) on the Medical Board of California; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- Ralph E. Koldinger
- Credential
- M.D.
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- G9968 CA
Self-reported in NPPES; status is on the state search - Practice location
- 3941 J Street, Sacramento, CA 95819
- Phone
- (916) 454-0655
- Enumerated
- Mar 29, 2007
- Record last updated
- Jul 10, 2015 (not updated in 11 years: call before relying on the address or phone)
- Fax
- (916) 454-5702
- Medicaid ID
- 7050815 CA
- Entity
- Type 1 · individual
Also registered at 3941 J Street
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Christopher Neubuerger, MDOrthopaedic Surgery Physician1023103793
- Padraig Oneill, MDClinical Cardiac Electrophysiology Physician1629140702
Verify Ralph E. Koldinger in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G9968Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Gastroenterology Physician providers in California
There are 2,140 gastroenterology physician records in California. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
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- John Abdulian, M.D.Fresno, CA1437114113
- Hussein Abidali, DORancho Cucamonga, CA1205274768
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- Donald Abrahm, M.D.Newport Beach, CA1215022405
- Maria Abreu, M.D.West Hollywood, CA1598793374
Common questions
What is Ralph E. Koldinger, M.D.'s NPI number?
Ralph E. Koldinger, M.D.'s National Provider Identifier (NPI) is 1952421703, issued on Mar 29, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Ralph E. Koldinger, M.D. located?
The NPPES record lists a practice address at 3941 J Street, Sacramento, CA, 95819. Phone: (916) 454-0655. Providers update this record themselves, so call before visiting.
How can I verify Ralph E. Koldinger, M.D.'s license?
NPPES lists California license number G9968, 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.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. 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.