NPI registry status
Active
2026 NPPES data Psychiatric/Mental Health Clinical Nurse Specialist NPI 1861139628 PA-C, CAQ-PSYCH
Verify on CMS → Michael Santillan, PA-C, CAQ-PSYCH
Psychiatric/Mental Health Clinical Nurse Specialist in Mission Viejo, California.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 978 in Psychiatric/Mental Health Clinical Nurse Specialist, and covers specialty classification, practice address, and Medicare Part D prescribing data when reported. According to CMS, every field reflects the provider's official federal registration, see our methodology.
Federal data, no proprietary rating.
We show these CMS records as-is - no composite score, no star rating, no editorial opinion layered on top.
Prescribing volume
864
Medicare Part D claims · 68 beneficiaries · Psychiatric/Mental Health Clinical Nurse Specialist avg: 1K
Generic prescribing
88%
generic claims · 12% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$4.8K
191 payments · CMS Open Payments (Sunshine Act)
Source: CMS Medicare Part D Prescriber Public Use File, 2023
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Michael Santillan, PA-C, CAQ-PSYCH filed 864 Medicare Part D claims in 2023 as a Psychiatric/Mental Health Clinical Nurse Specialist in Mission Viejo, California, prescribing 88% generic.
- 864
- Part D claims, 2023
- 88%
- generic prescribing
- $4.8K
- industry payments (Sunshine Act)
Every figure on this page comes straight from federal CMS records (NPPES, Medicare Part D, MIPS, Open Payments) - no proprietary rating or editorial opinion is applied.
Michael Santillan, PA-C, CAQ-PSYCH's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
864 Top 27% higher than 73% of 1,370,886 prescribers
Each bar is a band; taller bars hold more prescribers. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
Source CMS Medicare Part D Prescriber Public Use File · 2023
What does the federal data show about Michael Santillan, PA-C, CAQ-PSYCH?
Quality data not reportedPrimary specialty
Psychiatric/Mental Health Clinical Nurse Specialist
Medicare Part D claims
864 18% vs specialty avg
Specialty distribution in California
How Psychiatric/Mental Health Clinical Nurse Specialist compares to other specialties among California providers
Board certification
Not published by CMS
CMS does not publish a per-provider board-certification field in NPPES. PlainDoctor does not have a reliable per-specialty certification rate to show for Psychiatric/Mental Health Clinical Nurse Specialist. Verify directly:
How MIPS and board certification work
The Merit-based Incentive Payment System (MIPS) scores providers 0–100 across four performance categories: Quality, Cost, Promoting Interoperability, and Improvement Activities, weighted under 42 CFR §414.1380. Reporting is voluntary for many small practices, so absence of a MIPS score is not a quality signal.
Board certification through an ABMS or AOA member board signals voluntary post-licensure examination plus continuous Maintenance of Certification cycles. Verify any individual provider's status through certificationmatters.org (ABMS) or osteopathic.org (AOA).
Michael Santillan, PA-C, CAQ-PSYCH appears in the CMS NPPES registry as a Psychiatric/Mental Health Clinical Nurse Specialist provider holding PA-C, CAQ-PSYCH credentials at 26024 ACERO, Mission Viejo, CA, 92691, with a listed phone of (714) 545-5550. NPI 1861139628 was issued on 05/13/2022.
Medicare Part D records for calendar year 2023 show 864 prescription claims written by this provider, covering 68 Medicare beneficiaries and totaling roughly $347K in drug spend, split 12% brand-name and 88% generic by claim count.
Psychiatric/Mental Health Clinical Nurse Specialist is a narrow specialty nationwide, with 978 enrolled providers across 50 states and an average of 1,050 Part D claims per prescriber, so the context for interpreting these metrics differs meaningfully from a primary-care baseline.
Important: PlainDoctor is a directory of publicly available government data, not medical advice, a malpractice database, or a quality rating. Inclusion here does not imply a recommendation, and absence of complaints or sanctions on this page does not mean none exist, always verify credentials through the NPPES NPI Registry, your state medical board, and the ABMS or AOA before making healthcare decisions.
Practice Address
Provider Details
| NPI | 1861139628 |
|---|---|
| Specialty | Psychiatric/Mental Health Clinical Nurse Specialist |
| Credentials | PA-C, CAQ-PSYCH |
| Gender | Male |
| NPI Issued | 05/13/2022 |
Hospital and facility affiliations
Facilities where Michael Santillan, PA-C, CAQ-PSYCH bills Medicare from. Star ratings (1-5) are CMS Hospital Compare's "Hospital overall rating" - a composite of mortality, readmission, patient experience, safety, timely care, and efficient use of medical imaging measures. Source: CMS Care Compare.
Pacific Neuropsychiatric Specialists Inc
Murrieta, CA
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
Industry payments received (2024) - CMS Open Payments transparency data
The federal Physician Payments Sunshine Act (part of the Affordable Care Act) requires drug and medical-device manufacturers + group purchasing organizations to publicly report payments and other transfers of value to physicians and teaching hospitals. The data below covers 2024 for Michael Santillan, PA-C, CAQ-PSYCH. Source: openpaymentsdata.cms.gov.
Total received
$4.8K
Largest payer
Janssen Pharmaceuticals, Inc
Most common payment type
Food and Beverage
Industry payments are not necessarily indicators of bias, they include research funding, consulting fees for evidence-based work, royalties for inventions, food at conferences, and similar items. The disclosure exists for transparency. Read our methodology for how we interpret this data.
License & disciplinary context - California MBC 2023 annual report
Aggregate state board data only, NOT a determination of any individual provider's status. The figures below describe statewide disciplinary activity across all ~150K California medical licensees in 2023 - they are NOT specific to Michael Santillan, PA-C, CAQ-PSYCH. To verify Michael Santillan, PA-C, CAQ-PSYCH's current license status, search the MBC public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
576
Total board actions, California 2023
Across 556 cases
3.84
Actions per 1,000 licensees
California statewide rate
probation
Most common action type
186 cases
MBC publishes annual disciplinary statistics as part of public-record reporting under each state's Administrative Procedure Act. See the full breakdown by action type and year on the California disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Brand vs generic prescribing mix · Typical
Michael Santillan, PA-C, CAQ-PSYCH - brand share 12.0%
Psychiatric/Mental Health Clinical Nurse Specialist average
12% brand-name claims vs 88% generic, on 864 2023 Medicare Part D claims.
The federal Medicare Part D Generic Dispensing Rate national benchmark sits near 90% generic / 10% brand for primary-care prescribers, per CMS Office of the Actuary 2024 estimates. Higher brand share is common in specialty prescribing where generic equivalents are not available.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
864
Total Claims
$347K
Total Drug Cost
68
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 1,023
- Total Day Supply
- 29,506
- Brand vs Generic
- 12% brand / 88% generic
- Brand Drug Cost
- $325K
- Generic Drug Cost
- $22K
Patient Demographics
- Average Patient Age
- 61.1 years
- Avg HCC Risk Score
- 1.60
- Gender Split
- 53% female / 47% male
- Age Distribution
- <65: 32, 65-74: 28, 75-84: N/A, 85+: N/A
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Michael Santillan, PA-C, CAQ-PSYCH prescribes most
Top Medicare Part D drugs by claim count, 2023
- Trazodone Hcl
Trazodone Hcl
64 claims
- Fluoxetine Hcl
Fluoxetine Hcl
58 claims
- Sertraline Hcl
Sertraline Hcl
52 claims
- Duloxetine Hcl
Duloxetine Hcl
47 claims
- Quetiapine Fumarate
Quetiapine Fumarate
44 claims
- Alprazolam
Alprazolam
42 claims
- Buspirone Hcl
Buspirone Hcl
39 claims
- Clonazepam
Clonazepam
32 claims
| Drug | Claims |
|---|---|
| Trazodone Hcl | 64 |
| Fluoxetine Hcl | 58 |
| Sertraline Hcl | 52 |
| Duloxetine Hcl | 47 |
| Quetiapine Fumarate | 44 |
| Alprazolam | 42 |
| Buspirone Hcl | 39 |
| Clonazepam | 32 |
| Aripiprazole | 31 |
| Divalproex Sodium Er Divalproex Sodium | 30 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Psychiatric/Mental Health Clinical Nurse Specialist in CA →
All providers in California →
Compare specialties →
Psychiatric/Mental Health Clinical Nurse Specialist Overview
How Michael Santillan, PA-C, CAQ-PSYCH fits within the Psychiatric/Mental Health Clinical Nurse Specialist landscape nationally.
978
Psychiatric/Mental Health Clinical Nurse Specialist Providers in US
50
States with Psychiatric/Mental Health Clinical Nurse Specialist
1,050
Avg Claims per Provider
Michael Santillan, PA-C, CAQ-PSYCH's 864 claims are below the specialty average of 1,050.
Nearby Psychiatric/Mental Health Clinical Nurse Specialist Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Santillan.
Before you book an appointment
Use this federal record as your verification checklist, not as a recommendation.
- Confirm the NPI record is current in the official CMS registry, providers update their own NPPES details, and moves can lag. Verify this NPI
- Check the active license and any disciplinary history with the California medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Psychiatric/Mental Health Clinical Nurse Specialist peer on Medicare volume and prescribing patterns. Compare providers
Medicare Part D and MIPS figures describe practice patterns in federal programs only, they are not quality ratings, and PlainDoctor does not rate, rank, or recommend providers.
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Frequently Asked Questions
What is Michael Santillan, PA-C, CAQ-PSYCH's specialty? ▼
Michael Santillan, PA-C, CAQ-PSYCH specializes in Psychiatric/Mental Health Clinical Nurse Specialist and practices in Mission Viejo, California. Credentials: PA-C, CAQ-PSYCH.
How much does Michael Santillan, PA-C, CAQ-PSYCH prescribe under Medicare Part D? ▼
In 2023, Michael Santillan, PA-C, CAQ-PSYCH wrote 864 Medicare Part D claims totaling $347K in drug costs for 68 beneficiaries.
Where is Michael Santillan, PA-C, CAQ-PSYCH located? ▼
Michael Santillan, PA-C, CAQ-PSYCH is located at 26024 ACERO, Mission Viejo, CA, 92691. Phone: (714) 545-5550.
What is Michael Santillan, PA-C, CAQ-PSYCH's NPI number? ▼
Michael Santillan, PA-C, CAQ-PSYCH's National Provider Identifier (NPI) is 1861139628, issued on 05/13/2022.
Does Michael Santillan, PA-C, CAQ-PSYCH prescribe more brand-name or generic drugs? ▼
Michael Santillan, PA-C, CAQ-PSYCH's prescribing is 12% brand-name and 88% generic drugs by claim count, with $325K in brand drug costs.
How many Psychiatric/Mental Health Clinical Nurse Specialist providers are there in the US? ▼
There are 978 Psychiatric/Mental Health Clinical Nurse Specialist providers across 50 states in the US. The average Psychiatric/Mental Health Clinical Nurse Specialist provider writes 1,050 Medicare Part D claims per year.
What drugs does Michael Santillan, PA-C, CAQ-PSYCH prescribe most often? ▼
Based on 2023 Medicare Part D data, Michael Santillan, PA-C, CAQ-PSYCH's most frequently prescribed drugs include Trazodone Hcl, Fluoxetine Hcl, Sertraline Hcl. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Michael Santillan, PA-C, CAQ-PSYCH accept Medicare? ▼
Michael Santillan, PA-C, CAQ-PSYCH appears in CMS Medicare data with 864 Part D claims and 68 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Michael Santillan, PA-C, CAQ-PSYCH's credentials? ▼
Michael Santillan, PA-C, CAQ-PSYCH's NPI is 1861139628 with credentials PA-C, CAQ-PSYCH. You can verify this through the NPPES NPI Registry, check state medical board records, and confirm board certification through the ABMS or AOA.
Data Sources
View source datasets and methodology notes
- Provider Directory
- CMS National Plan and Provider Enumeration System (NPPES), download.cms.gov/nppes, updated monthly. Contains NPI, specialty, credentials, and practice location.
- Specialty Classification
- NUCC Health Care Provider Taxonomy (nucc.org), the industry standard for classifying provider specialties in Medicare and Medicaid billing.
- Prescribing Data
- CMS Medicare Part D Prescriber Public Use File (2023). Includes claims, drug costs, beneficiaries, and opioid prescribing rates.
- Limitations
- Provider data is self-reported to CMS. Prescribing data reflects Medicare Part D only and does not include commercial insurance, Medicaid, or cash prescriptions. Claims below 11 beneficiaries are suppressed by CMS for privacy.
See our complete data methodology for details on how we collect and process government data.
Data as of April 2026 (NPPES) / 2023 (Medicare Part D). Source: Centers for Medicare & Medicaid Services (CMS).
Disclaimer: Data from CMS NPPES and Medicare Part D. PlainDoctor does not rate or rank providers. Provider information is self-reported and may not be current. Always verify information directly with the provider. About · Methodology
Compiled from official public sources by the PlainDoctor editorial team.
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of May 2026.