Donald Richard Knotts, MEDICAL DOCTOR
Internal Medicine Physician · Castro Valley, CA
Donald Richard Knotts, MEDICAL DOCTOR is an internal medicine physician with a practice address in Castro Valley, California, and NPI 1790858611, issued on Nov 16, 2006. Check the license (California G33548, as entered in NPPES) on the Medical Board of California; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- Donald Richard Knotts
- Credential
- MEDICAL DOCTOR
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- G33548 CA
Self-reported in NPPES; status is on the state search - Practice location
- 20130 Lake Chabot RD, Castro Valley, CA 94546
- Phone
- (510) 886-3701
- Enumerated
- Nov 16, 2006
- Record last updated
- Jul 9, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (510) 537-3194
- Medicaid ID
- 00G355480 CA
- Entity
- Type 1 · individual
Also registered at 20130 Lake Chabot RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Donald Richard Knotts in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G33548Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
24 internal medicine physician records list a practice address in Castro Valley
They are 24 of the 999 NPPES records with a practice address in Castro Valley, and 17,696 internal medicine physician records in California. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 24 in Castro Valley → All 17,696 in California → Every provider in Castro Valley →
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Common questions
What is Donald Richard Knotts, MEDICAL DOCTOR's NPI number?
Donald Richard Knotts, MEDICAL DOCTOR's National Provider Identifier (NPI) is 1790858611, issued on Nov 16, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Donald Richard Knotts, MEDICAL DOCTOR located?
The NPPES record lists a practice address at 20130 Lake Chabot RD, Castro Valley, CA, 94546. Phone: (510) 886-3701. Providers update this record themselves, so call before visiting.
How can I verify Donald Richard Knotts, MEDICAL DOCTOR's license?
NPPES lists California license number G33548, 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.