Karen Hsu Patterson, MSN, RN, FNP-C
Nurse Practitioner · Santa Monica, CA
Karen Hsu Patterson, MSN, RN, FNP-C is a nurse practitioner with a practice address in Santa Monica, California, and NPI 1851704977, issued on Jun 5, 2014. Check the license (California 22912, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Karen Hsu Patterson
- Credential
- MSN, RN, FNP-C
- Primary taxonomy
- Nurse Practitioner 363L00000X
- License number
- 22912 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2021 Santa Monica Blvd Ste 245E, Santa Monica, CA 90404
- Phone
- (310) 829-8975
- Enumerated
- Jun 5, 2014
- Record last updated
- Feb 13, 2024
- Fax
- (424) 291-4108
- Medicare enrollment
- Enrolled (PECOS I20150612002224); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest nurse practitioner records → All 8,223 in California → Look up another NPI →
Also registered at 2021 Santa Monica Blvd Ste 245E
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Karen Hsu Patterson in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license 22912Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
96% fewer Medicare Part D claims than the average nurse practitioner in 2024
48 Medicare Part D claims for 19 beneficiaries, against an average of 1,109 among the 54,319 providers of this specialty who prescribed in Part D. 23 claims were for opioids.
Most prescribed
- Methadone Hcl11 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- Providence Saint Johns Medical FoundationSanta Monica, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Karen Hsu Patterson among 8,223 nurse practitioner records in California
Karen Hsu Patterson, MSN, RN, FNP-C is one of 8,223 nurse practitioner records with a practice address in California. 65% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2014, is newer than 42% of them.
- NPI issued2014 · 42% of these records are older, 55% newer
- In a Medicare fileYes · 65% of these records are
- In the CMS Doctors and Clinicians fileYes · 42% of these records are
- Graduated2012 · median 2017 among the 3,425 with a school on file
- Record last updated2024 · 45% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363L00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
79 nurse practitioner records list a practice address in Santa Monica
They are 79 of the 5,151 NPPES records with a practice address in Santa Monica, and 8,223 nurse practitioner records in California.
All 8,223 in California → Every provider in Santa Monica → Nurse Practitioner nationwide →
The 8 nurse practitioner records with the nearest ZIP codes
- Sandra Brackert, NPSanta Monica, CA 904041881824332
- Nancy Bush, NPSanta Monica, CA 904041760607212
- Elizabeth Cray, NPSanta Monica, CA 904041740405372
- Sarah D'Ambruoso, RN, NPSanta Monica, CA 904041548532344
- Irene Davis, NPSanta Monica, CA 904041619260015
- Eskedar Gizaw, NPSanta Monica, CA 904041861737017
- Darlene Martin, N.P.Santa Monica, CA 904041356645881
- Melody Mendenhall, N.P.Santa Monica, CA 904041568632503
Common questions
What is Karen Hsu Patterson, MSN, RN, FNP-C's NPI number?
Karen Hsu Patterson, MSN, RN, FNP-C's National Provider Identifier (NPI) is 1851704977, issued on Jun 5, 2014. An NPI identifies a provider in billing; it is not a license.
Where is Karen Hsu Patterson, MSN, RN, FNP-C located?
The NPPES record lists a practice address at 2021 Santa Monica Blvd Ste 245E, Santa Monica, CA, 90404. Phone: (310) 829-8975. Providers update this record themselves, so call before visiting.
How can I verify Karen Hsu Patterson, MSN, RN, FNP-C's license?
NPPES lists California license number 22912, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Karen Hsu Patterson, MSN, RN, FNP-C prescribe under Medicare Part D?
In 2024, Karen Hsu Patterson, MSN, RN, FNP-C had 48 Medicare Part D claims for 19 beneficiaries; the average among nurse practitioner prescribers was 1,109. Part D covers Medicare prescriptions 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. Medicare files from data.cms.gov. 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.