David J. Witt, MD
Infectious Disease Physician · San Rafael, CA
David J. Witt, MD is an infectious disease physician with a practice address in San Rafael, California, and NPI 1710061783, issued on Oct 25, 2006. Check the license (California G46814, as entered in NPPES) on the Medical Board of California; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- David J. Witt
- Credential
- MD
- Primary taxonomy
- Infectious Disease Physician 207RI0200X
- License number
- G46814 CA
Self-reported in NPPES; status is on the state search - Practice location
- 99 Montecillo RD, San Rafael, CA 94903
- Phone
- (415) 444-2000
- Enumerated
- Oct 25, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Medicaid ID
- 00G468140 CA
- Medicare enrollment
- Enrolled (PECOS I20040826001325); accepts Medicare assignment
- Medical or professional school
- University Of Michigan Medical School, 1979
- Entity
- Type 1 · individual
8 nearest infectious disease physician records → All 1,119 in California → Look up another NPI →
Also registered at 99 Montecillo RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Tarik Alagha, MDInternal Medicine Physician1740869676
- Paul Alpert, MDUrology Physician1417031402
Verify David J. Witt in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G46814Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
David J. Witt among 1,119 infectious disease physician records in California
David J. Witt, MD is one of 1,119 infectious disease 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 not. Its NPI, issued in 2006, is newer than 4% of them.
- NPI issued2006 · 4% of these records are older, 54% newer
- In a Medicare fileNo · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 66% of these records are
- Graduated1979 · median 2003 among the 735 with a school on file
- Record last updated2007 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RI0200X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Infectious Disease Physician providers in California
There are 1,119 infectious disease physician records in California. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 1,119 in California → Every provider in San Rafael → Infectious Disease Physician nationwide →
The 8 infectious disease physician records with the nearest ZIP codes
- Rehan Syed, MD, MSCSan Rafael, CA 949031134653165
- Catherine Treseler, MDSan Rafael, CA 949031730251562
- Anucheat Chea, M.D.Greenbrae, CA 949041952663635
- Lael Duncan, MDKentfield, CA 949041447255740
- Rina Marfatia, M.B.B.S., M.D.Greenbrae, CA 949041508055138
- Gregg Tolliver, M.D.Greenbrae, CA 949041346286465
- Mary Ellen Guroy, MDSan Rafael, CA 949011801971882
- James Heffelfinger, M.D.San Rafael, CA 949011619931698
Common questions
What is David J. Witt, MD's NPI number?
David J. Witt, MD's National Provider Identifier (NPI) is 1710061783, issued on Oct 25, 2006. An NPI identifies a provider in billing; it is not a license.
Where is David J. Witt, MD located?
The NPPES record lists a practice address at 99 Montecillo RD, San Rafael, CA, 94903. Phone: (415) 444-2000. Providers update this record themselves, so call before visiting.
How can I verify David J. Witt, MD's license?
NPPES lists California license number G46814, 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.