Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Mary Jean Shimane, DMD
Dentist in Castro Valley, CA · enumerated 2016.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1851848196
See something wrong? Report a correction
Registry record
Entity type Individual (Type 1)
Name Dr. Mary Jean Shimane
Credential DMD
Sex Female
Practice address 20099 Redwood Rd, Castro Valley, CA, 94546
Phone (510) 881-1611
Enumeration date Sep 2, 2016
Last updated in NPPES Sep 2, 2016
Taxonomy & licenses
DMD · Doctor of Medicine in Dentistry: A licensed dentist; DMD and DDS are equivalent dental degrees.
About the DMD credential
What is an NPI number?
A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.
Frequently asked questions
How do I verify Mary Shimane's NPI record?
Cross-check NPI 1851848196 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Is NPI 1851848196 active?
Yes, as of the latest NPPES snapshot, NPI 1851848196 is active (record last updated 2016-09-02).
Other providers at this practice address
Browse all →Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2016-09-02.