Mark B. Oechsli, PAC
Physician Assistant · Simi Valley, CA
Mark B. Oechsli, PAC is a physician assistant with a practice address in Simi Valley, California, and NPI 1497748149, issued on Aug 29, 2005. Check the license (California PA14447, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Mark B. Oechsli
- Credential
- PAC
- Primary taxonomy
- Physician Assistant 363A00000X
- License number
- PA14447 CA
Self-reported in NPPES; status is on the state search - Practice location
- 4531 Alamo St, Simi Valley, CA 93063
- Phone
- (805) 520-3248
- Enumerated
- Aug 29, 2005
- Record last updated
- Jul 17, 2023
- Fax
- (805) 579-6082
- Entity
- Type 1 · individual
8 nearest physician assistant records → All 14,451 in California → Look up another NPI →
Also registered at 4531 Alamo St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Linda Rubino, PA-CPhysician Assistant1114054889
Verify Mark B. Oechsli in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license PA14447Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
65% fewer Medicare Part D claims than the average physician assistant in 2024
294 Medicare Part D claims for 46 beneficiaries, against an average of 830 among the 101,058 providers of this specialty who prescribed in Part D.
Most prescribed
- Atorvastatin Calcium35 claims
- Hydrochlorothiazide14 claims
- Metoprolol Succinate14 claims
- Furosemide13 claims
- Benazepril Hcl12 claims
- Entresto12 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.
Mark B. Oechsli among 14,451 physician assistant records in California
Mark B. Oechsli, PAC 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 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 99% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileNo · 50% of these records are
- Record last updated2023 · 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).
35 physician assistant records list a practice address in Simi Valley
They are 35 of the 1,397 NPPES records with a practice address in Simi Valley, and 14,451 physician assistant records in California.
All 14,451 in California → Every provider in Simi Valley → Physician Assistant nationwide →
The 8 physician assistant records with the nearest ZIP codes
- Nadia HeloSimi Valley, CA 930631932996402
- Aaron Highsmith, PASimi Valley, CA 930631124290093
- Megan Leeper, PA-CSimi Valley, CA 930631922595701
- Joephillip LobustaSimi Valley, CA 930631861232563
- Christina Massuros, PASimi Valley, CA 930631386305076
- Catherine Phillips, PA CSimi Valley, CA 930631336132422
- Linda Rubino, PA-CSimi Valley, CA 930631114054889
- Ingrid Sharpe, PA-CSimi Valley, CA 930631144619784
Common questions
What is Mark B. Oechsli, PAC's NPI number?
Mark B. Oechsli, PAC's National Provider Identifier (NPI) is 1497748149, issued on Aug 29, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Mark B. Oechsli, PAC located?
The NPPES record lists a practice address at 4531 Alamo St, Simi Valley, CA, 93063. Phone: (805) 520-3248. Providers update this record themselves, so call before visiting.
How can I verify Mark B. Oechsli, PAC's license?
NPPES lists California license number PA14447, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Mark B. Oechsli, PAC prescribe under Medicare Part D?
In 2024, Mark B. Oechsli, PAC had 294 Medicare Part D claims for 46 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.