Cassandra Lynn Williamson, RDHAP
Dental Hygienist · San Luis Obispo, CA
Cassandra Lynn Williamson, RDHAP is a dental hygienist with a practice address in San Luis Obispo, California, and NPI 1376236067, issued on May 30, 2023. Check the license (California HAP989, as entered in NPPES) with the California board that licenses this profession; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- Cassandra Lynn Williamson
- Credential
- RDHAP
- Primary taxonomy
- Dental Hygienist 124Q00000X
- License number
- HAP989 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1311 Fernwood Dr, San Luis Obispo, CA 93401
- Phone
- (909) 693-0621
- Enumerated
- May 30, 2023
- Record last updated
- Sep 11, 2023
- Entity
- Type 1 · individual
8 nearest dental hygienist records → All 1,874 in California → Look up another NPI →
Verify Cassandra Lynn Williamson in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license HAP989Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Cassandra Lynn Williamson among 1,874 dental hygienist records in California
Cassandra Lynn Williamson, RDHAP is one of 1,874 dental hygienist records with a practice address in California. 1% 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 2023, is newer than 75% of them.
- NPI issued2023 · 75% of these records are older, 20% newer
- In a Medicare fileNo · 1% of these records are
- In the CMS Doctors and Clinicians fileNo · under 1% of these records are
- Record last updated2023 · 65% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 124Q00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Dental Hygienist providers in California
There are 1,874 dental hygienist records in California. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 1,874 in California → Every provider in San Luis Obispo → Dental Hygienist nationwide →
The 8 dental hygienist records with the nearest ZIP codes
- Theresa Anselmo, RDHSan Luis Obispo, CA 934011144589516
- Michaela Bixler, R.D.H.San Luis Obispo, CA 934011215016308
- Cydney HurstSan Luis Obispo, CA 934011770186868
- Hillary MaccreadySan Luis Obispo, CA 934011235886433
- Micheline Mehall, RDH 17521San Luis Obispo, CA 934011346333119
- Barbara Morrow, RDHSan Luis Obispo, CA 934011497228399
- Melanie Waters, R.D.H.A.P.San Luis Obispo, CA 934011942576426
- Annette Hannig, RDHAPLos Osos, CA 934021083011837
Common questions
What is Cassandra Lynn Williamson, RDHAP's NPI number?
Cassandra Lynn Williamson, RDHAP's National Provider Identifier (NPI) is 1376236067, issued on May 30, 2023. An NPI identifies a provider in billing; it is not a license.
Where is Cassandra Lynn Williamson, RDHAP located?
The NPPES record lists a practice address at 1311 Fernwood Dr, San Luis Obispo, CA, 93401. Phone: (909) 693-0621. Providers update this record themselves, so call before visiting.
How can I verify Cassandra Lynn Williamson, RDHAP's license?
NPPES lists California license number HAP989, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
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.