Michael Steven Santillan, PA-C, CAQ-PSYCH
Medical Physician Assistant · Mission Viejo, CA
Michael Steven Santillan, PA-C, CAQ-PSYCH is a medical physician assistant with a practice address in Mission Viejo, California, and NPI 1861139628, issued on May 13, 2022. Check the license (California PA61412, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Michael Steven Santillan
- Credential
- PA-C, CAQ-PSYCH
- Primary taxonomy
- Medical Physician Assistant 363AM0700X
- License number
- PA61412 CA
Self-reported in NPPES; status is on the state search - Practice location
- 26024 Acero, Mission Viejo, CA 92691
- Phone
- (714) 545-5550
- Enumerated
- May 13, 2022
- Record last updated
- Sep 30, 2025
- Fax
- (949) 609-0374
- Medicare enrollment
- Enrolled (PECOS I20221012003366); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest medical physician assistant records → All 3,376 in California → Look up another NPI →
Also registered at 26024 Acero
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Madeleine Fajilan, PA-CPsychiatric/Mental Health Clinical Nurse Specialist1548810591
- Krista Fendrick, PA-CPsychiatric/Mental Health Clinical Nurse Specialist1316297286
- Monique Hutchinson, PA-CPhysician Assistant1154701399
- Sarah Kantelis, PAPsychiatric/Mental Health Clinical Nurse Specialist1881047892
- Jenny Le, PA-CPhysician Assistant1518596568
Verify Michael Steven Santillan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license PA61412Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
37% more Medicare Part D claims than the average medical physician assistant in 2024
1,578 Medicare Part D claims for 97 beneficiaries, against an average of 1,148 among the 23,801 providers of this specialty who prescribed in Part D. Brand-name drugs were 12% of claims.
Most prescribed
- Trazodone Hcl113 claims
- Fluoxetine Hcl98 claims
- Quetiapine Fumarate82 claims
- Sertraline Hcl78 claims
- Aripiprazole73 claims
- Bupropion Xl49 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.
Industry payments in 2024: $4,819.55
191 payments; by number, the most common kind was food and beverage; the largest payer was Janssen Pharmaceuticals, Inc. The 16,165 providers of this specialty with any payment received $1,055.00 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Pacific Neuropsychiatric Specialists IncMurrieta, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Michael Steven Santillan among 3,376 medical physician assistant records in California
Michael Steven Santillan, PA-C, CAQ-PSYCH is one of 3,376 medical physician assistant records with a practice address in California. 69% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2022, is newer than 82% of them.
- NPI issued2022 · 82% of these records are older, 14% newer
- In a Medicare fileYes · 69% of these records are
- In the CMS Doctors and Clinicians fileYes · 40% of these records are
- Graduated2022 · median 2012 among the 1,347 with a school on file
- Record last updated2025 · 54% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363AM0700X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Medical Physician Assistant providers in California
There are 3,376 medical physician assistant records in California.
All 3,376 in California → Every provider in Mission Viejo → Medical Physician Assistant nationwide →
The 8 medical physician assistant records with the nearest ZIP codes
- Jaehyun Cho, PAMission Viejo, CA 926911053952002
- Jessica Cummings, PA-CMission Viejo, CA 926911033480942
- Nafise Dolan, PA-CMission Viejo, CA 926911588260616
- Nicole Franklin, P.A.-CMission Viejo, CA 926911215023718
- Natasha Maylor, PA-CMission Viejo, CA 926911275497745
- Joseph NojanMission Viejo, CA 926911083380885
- Ryan Ah San, PA-CRancho Santa Margarita, CA 926881013181346
- Stephanie Plowman, DPT, PA-CLadera Ranch, CA 926941154593739
Common questions
What is Michael Steven Santillan, PA-C, CAQ-PSYCH's NPI number?
Michael Steven Santillan, PA-C, CAQ-PSYCH's National Provider Identifier (NPI) is 1861139628, issued on May 13, 2022. An NPI identifies a provider in billing; it is not a license.
Where is Michael Steven Santillan, PA-C, CAQ-PSYCH located?
The NPPES record lists a practice address at 26024 Acero, Mission Viejo, CA, 92691. Phone: (714) 545-5550. Providers update this record themselves, so call before visiting.
How can I verify Michael Steven Santillan, PA-C, CAQ-PSYCH's license?
NPPES lists California license number PA61412, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Michael Steven Santillan, PA-C, CAQ-PSYCH prescribe under Medicare Part D?
In 2024, Michael Steven Santillan, PA-C, CAQ-PSYCH had 1,578 Medicare Part D claims for 97 beneficiaries; the average among medical physician assistant prescribers was 1,148. 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.