Cassandra L. Karn, P.A.
Physician Assistant · Mission Viejo, CA
Cassandra L. Karn, P.A. is a physician assistant with a practice address in Mission Viejo, California, and NPI 1245247774, issued on Aug 1, 2006. Check the license (California PA16936, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Cassandra L. Karn
- Credential
- P.A.
- Primary taxonomy
- Physician Assistant 363A00000X
- License number
- PA16936 CA
Self-reported in NPPES; status is on the state search - Practice location
- 27700 Medical Center RD, Mission Viejo, CA 92691
- Phone
- (949) 365-3862
- Enumerated
- Aug 1, 2006
- Record last updated
- Jul 9, 2010 (not updated in 16 years: call before relying on the address or phone)
- Medicaid ID
- PA16936 CA
- Entity
- Type 1 · individual
8 nearest physician assistant records → All 14,451 in California → Look up another NPI →
Also registered at 27700 Medical Center RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Mehdi Amiri, PHARM. D.Pharmacist1528586799
- Ivan Babin, M.D.Vascular & Interventional Radiology Physician1134461486
- Danniella BermanPhysician Assistant1740849363
- Michael Blumenfeld, M.D.Anatomic Pathology & Clinical Pathology Physician1578679882
- Emily Brady, MD, MPHAnesthesiology Physician1801107669
Verify Cassandra L. Karn in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license PA16936Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
84% fewer Medicare Part D claims than the average physician assistant in 2024
135 Medicare Part D claims for 82 beneficiaries, against an average of 830 among the 101,058 providers of this specialty who prescribed in Part D. 42 claims were for opioids.
Most prescribed
- Hydrocodone-Acetaminophen30 claims
- Ondansetron Odt15 claims
- Cephalexin11 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.
Cassandra L. Karn among 14,451 physician assistant records in California
Cassandra L. Karn, P.A. is one of 14,451 physician assistant records with a practice address in California. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 1% of them.
- NPI issued2006 · 1% of these records are older, 87% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileNo · 50% of these records are
- Record last updated2010 · 40% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363A00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
50 physician assistant records list a practice address in Mission Viejo
They are 50 of the 2,156 NPPES records with a practice address in Mission Viejo, and 14,451 physician assistant records in California.
All 14,451 in California → Every provider in Mission Viejo → Physician Assistant nationwide →
The 8 physician assistant records with the nearest ZIP codes
- Kira Babb, PA-CMission Viejo, CA 926911730318767
- Stephanie Blodgett, PA-CMission Viejo, CA 926911720287170
- Tria Brummond, PA-CMission Viejo, CA 926911952461659
- Linda Kiehlmeir, P.A-CMission Viejo, CA 926911902834575
- Lara Manchik, P.A.C.Mission Viejo, CA 926911639108327
- John Mellott, P.A.Mission Viejo, CA 926911023041902
- Lorelei Opene, PA-CMission Viejo, CA 926911659350445
- Rakhi Paleker, PA-CMission Viejo, CA 926911396850962
Common questions
What is Cassandra L. Karn, P.A.'s NPI number?
Cassandra L. Karn, P.A.'s National Provider Identifier (NPI) is 1245247774, issued on Aug 1, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Cassandra L. Karn, P.A. located?
The NPPES record lists a practice address at 27700 Medical Center RD, Mission Viejo, CA, 92691. Phone: (949) 365-3862. Providers update this record themselves, so call before visiting.
How can I verify Cassandra L. Karn, P.A.'s license?
NPPES lists California license number PA16936, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Cassandra L. Karn, P.A. prescribe under Medicare Part D?
In 2024, Cassandra L. Karn, P.A. had 135 Medicare Part D claims for 82 beneficiaries; the average among physician assistant prescribers was 830. 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.