Catherine Loomis, PA-C
Physician Assistant · Ladera Ranch, CA
Catherine Loomis, PA-C is a physician assistant with a practice address in Ladera Ranch, California, and NPI 1548870249, issued on Aug 6, 2020. Check the license (California PA57943, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Catherine Loomis
- Credential
- PA-C
- Primary taxonomy
- Physician Assistant 363A00000X
- License number
- PA57943 CA
Self-reported in NPPES; status is on the state search - Practice location
- 27522 Antonio Pkwy Ste P3, Ladera Ranch, CA 92694
- Phone
- (949) 267-3141
- Enumerated
- Aug 6, 2020
- Record last updated
- Aug 6, 2020 (not updated in 6 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20230828002568); accepts Medicare assignment
- Medical or professional school
- Tufts University School Of Medicine, 2020
- Entity
- Type 1 · individual
8 nearest physician assistant records → All 14,451 in California → Look up another NPI →
Also registered at 27522 Antonio Pkwy Ste P3
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Miranda De Luna, MDFamily Medicine Physician1023235819
- Kathy O'Kelley, NPFamily Nurse Practitioner1801107313
- Melika Powell, FNPFamily Nurse Practitioner1376814202
- Parisa Shirkhani, NP-CNurse Practitioner1164188975
Verify Catherine Loomis in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license PA57943Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
60% fewer Medicare Part D claims than the average physician assistant in 2024
330 Medicare Part D claims for 242 beneficiaries, against an average of 830 among the 101,058 providers of this specialty who prescribed in Part D.
Most prescribed
- Amoxicillin-Clavulanate Potass46 claims
- Albuterol Sulfate Hfa28 claims
- Cephalexin26 claims
- Nitrofurantoin Mono-Macro25 claims
- Azithromycin24 claims
- Doxycycline Hyclate20 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
- Patriot Urgent Care Professionals PCWaltham, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Catherine Loomis among 14,451 physician assistant records in California
Catherine Loomis, PA-C 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 2020, is newer than 62% of them.
- NPI issued2020 · 62% of these records are older, 33% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 50% of these records are
- Graduated2020 · median 2018 among the 7,214 with a school on file
- Record last updated2020 · 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).
4 physician assistant records list a practice address in Ladera Ranch
They are 4 of the 264 NPPES records with a practice address in Ladera Ranch, and 14,451 physician assistant records in California.
All 14,451 in California → Every provider in Ladera Ranch → Physician Assistant nationwide →
The 8 physician assistant records with the nearest ZIP codes
- Anthony Manzo, PA-C, PARAMEDICLadera Ranch, CA 926941356816920
- Steve Rhyan, P.A.Ladera Ranch, CA 926941891020483
- Annie Shugarman, P.A.-CLadera Ranch, CA 926941982701249
- Tamar Davidson, PA-CMission Viejo, CA 926921619390614
- Elizabeth PhillipsMission Viejo, CA 926921306216361
- Brett Cirbo, PAMission Viejo, CA 926911861153223
- Sydney CohenMission Viejo, CA 926911437986171
- Selma DjokovicMission Viejo, CA 926911568160810
Common questions
What is Catherine Loomis, PA-C's NPI number?
Catherine Loomis, PA-C's National Provider Identifier (NPI) is 1548870249, issued on Aug 6, 2020. An NPI identifies a provider in billing; it is not a license.
Where is Catherine Loomis, PA-C located?
The NPPES record lists a practice address at 27522 Antonio Pkwy Ste P3, Ladera Ranch, CA, 92694. Phone: (949) 267-3141. Providers update this record themselves, so call before visiting.
How can I verify Catherine Loomis, PA-C's license?
NPPES lists California license number PA57943, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Catherine Loomis, PA-C prescribe under Medicare Part D?
In 2024, Catherine Loomis, PA-C had 330 Medicare Part D claims for 242 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.