Kenneth James Lossing, DO
Family Medicine Physician · San Rafael, CA
Kenneth James Lossing, DO is a family medicine physician with a practice address in San Rafael, California, and NPI 1891884243, issued on Oct 12, 2006. Check the license (California 20A6902, as entered in NPPES) on the Medical Board of California; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- Kenneth James Lossing
- Credential
- DO
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 20A6902 CA
Self-reported in NPPES; status is on the state search - Practice location
- 909 Irwin St, San Rafael, CA 94901
- Phone
- (415) 454-8979
- Enumerated
- Oct 12, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 17,133 in California → Look up another NPI →
Verify Kenneth James Lossing in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A6902Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Kenneth James Lossing among 17,133 family medicine physician records in California
Kenneth James Lossing, DO is one of 17,133 family medicine physician records with a practice address in California. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2006, is newer than 6% of them.
- NPI issued2006 · 6% of these records are older, 59% newer
- In a Medicare fileNo · 81% of these records are
- In the CMS Doctors and Clinicians fileNo · 62% of these records are
- Record last updated2007 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
37 family medicine physician records list a practice address in San Rafael
They are 37 of the 3,159 NPPES records with a practice address in San Rafael, and 17,133 family medicine physician records in California. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 17,133 in California → Every provider in San Rafael → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Mark Agness, M.D.Marysville, CA 949011609816743
- Michael Frumkin, MDSan Rafael, CA 949011154382158
- Darell Hawley, DOSan Rafael, CA 949011295484962
- Iver Juster, MDSan Rafael, CA 949011073437026
- Steven Segerstrom, M.DMarysville, CA 949011205876240
- Suzanna Sherer, NPSan Rafael, CA 949011336630334
- Allison Slater, MD, MBESan Rafael, CA 949011790362085
- David Tully-Smith, M.D.San Rafael, CA 949011598890287
Common questions
What is Kenneth James Lossing, DO's NPI number?
Kenneth James Lossing, DO's National Provider Identifier (NPI) is 1891884243, issued on Oct 12, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Kenneth James Lossing, DO located?
The NPPES record lists a practice address at 909 Irwin St, San Rafael, CA, 94901. Phone: (415) 454-8979. Providers update this record themselves, so call before visiting.
How can I verify Kenneth James Lossing, DO's license?
NPPES lists California license number 20A6902, 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.