Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

Donald R. Knotts, MD Inc

Organization Medical Specialty Clinic/Center · NPI 1750589560

Donald R. Knotts, MD Inc is a Medical Specialty Clinic/Center in Castro Valley, California. Licensed in California. Registered with an NPI since 2007.

Licensed in
CA
In the registry since
2007
What do these letters mean?
Inc — Incorporated
A form of business registration, not a clinical qualification.

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Practice location Address checks out

20130 Lake Chabot Rd Ste 309
Castro Valley, CA 94546-5340
Phone: (510) 886-3701
Fax: (510) 537-3194
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Medical Specialty Clinic/Center (primary) Taxonomy 261QM2500X · Licence G35548 (CA)

Record details

NPI number1750589560
Entity typeOrganization (Type 2)
Organization subpartNo
Authorized official Donald Knotts — Owner · (510) 886-3701
NPI enumeratedJuly 3, 2007
Last updated in NPPESAugust 22, 2020
Mailing address20130 Lake Chabot Rd, Suite 309, Castro Valley, CA 94546-5340