NPI registry status
Active
2026 NPPES data Medical Physician Assistant NPI 1215118997
Verify on CMS → Thomas Warner
Medical Physician Assistant in Corcoran, 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 40,580 in Medical Physician Assistant, 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
1K
Medicare Part D claims · 147 beneficiaries · Medical Physician Assistant avg: 1K
Generic prescribing
82%
generic claims · 17% brand-name · higher generic rates reduce patient out-of-pocket costs
Source: CMS Medicare Part D Prescriber Public Use File, 2023
What the federal data shows
Thomas Warner filed 1,248 Medicare Part D claims in 2023 as a Medical Physician Assistant in Corcoran, California, prescribing 82% generic.
- 1K
- Part D claims, 2023
- 82%
- generic prescribing
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.
Thomas Warner's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
1,248 Top 22% higher than 78% 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 Thomas Warner?
Quality data not reportedPrimary specialty
Medical Physician Assistant
Medicare Part D claims
1,248 16% vs specialty avg
Specialty distribution in California
How Medical Physician Assistant 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 Medical Physician Assistant. 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).
Thomas Warner appears in the CMS NPPES registry as a Medical Physician Assistant provider at 1212 HANNA AVE, Corcoran, CA, 93212, with a listed phone of (559) 992-2800. NPI 1215118997 was issued on 11/21/2007.
Medicare Part D records for calendar year 2023 show 1,248 prescription claims written by this provider, covering 147 Medicare beneficiaries and totaling roughly $160K in drug spend, split 17% brand-name and 82% generic by claim count.
Medical Physician Assistant is a mid-sized specialty nationwide, with 40,580 enrolled providers across 55 states and an average of 1,077 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 | 1215118997 |
|---|---|
| Specialty | Medical Physician Assistant |
| Gender | Male |
| NPI Issued | 11/21/2007 |
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 Thomas Warner. To verify Thomas Warner'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
Thomas Warner - brand share 17.0%
Medical Physician Assistant average
17% brand-name claims vs 82% generic, on 1,248 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.
1,248
Total Claims
$160K
Total Drug Cost
147
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 1,744
- Total Day Supply
- 47,874
- Brand vs Generic
- 17% brand / 82% generic
- Brand Drug Cost
- $112K
- Generic Drug Cost
- $48K
- Antibiotic Claims
- 67
Patient Demographics
- Average Patient Age
- 65.9 years
- Avg HCC Risk Score
- 1.38
- Gender Split
- 58% female / 42% male
- Age Distribution
- <65: 41, 65-74: 80, 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 Thomas Warner prescribes most
Top Medicare Part D drugs by claim count, 2023
- Metformin Hcl
Metformin Hcl
62 claims
- Atorvastatin Calcium
Atorvastatin Calcium
52 claims
- Gabapentin
Gabapentin
47 claims
- Amlodipine Besylate
Amlodipine Besylate
44 claims
- Lisinopril
Lisinopril
43 claims
- Ozempic
Ozempic
42 claims
- Levothyroxine Sodium
Levothyroxine Sodium
38 claims
- Fluticasone Propio…
Fluticasone Propionate
37 claims
| Drug | Claims |
|---|---|
| Metformin Hcl | 62 |
| Atorvastatin Calcium | 52 |
| Gabapentin | 47 |
| Amlodipine Besylate | 44 |
| Lisinopril | 43 |
| Ozempic Semaglutide | 42 |
| Levothyroxine Sodium | 38 |
| Fluticasone Propionate | 37 |
| Metoprolol Tartrate | 30 |
| Clopidogrel Clopidogrel Bisulfate | 25 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Medical Physician Assistant Overview
How Thomas Warner fits within the Medical Physician Assistant landscape nationally.
40,580
Medical Physician Assistant Providers in US
55
States with Medical Physician Assistant
1,077
Avg Claims per Provider
Thomas Warner's 1,248 claims are above the specialty average of 1,077.
Nearby Medical Physician Assistant Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Warner.
Dr. Bridget Abajian
PA-C
Los Angeles, CA
Dr. Crispin Abbott
PHYSICIAN ASSISTANT
Thousand Oaks, CA
Dr. Abdol Hamid Abdali Hajiabadi
P.A.
Santa Ana, CA
Dr. Jilbert Abnoosian
PA
Lynwood, CA
Dr. Sakina Abowath
P.A.
Diamond Bar, CA
Compare Medical Physician Assistant nationally: see state-by-state distribution →
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 Medical Physician Assistant 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 Thomas Warner's specialty? ▼
Thomas Warner specializes in Medical Physician Assistant and practices in Corcoran, California.
How much does Thomas Warner prescribe under Medicare Part D? ▼
In 2023, Thomas Warner wrote 1,248 Medicare Part D claims totaling $160K in drug costs for 147 beneficiaries.
Where is Thomas Warner located? ▼
Thomas Warner is located at 1212 HANNA AVE, Corcoran, CA, 93212. Phone: (559) 992-2800.
What is Thomas Warner's NPI number? ▼
Thomas Warner's National Provider Identifier (NPI) is 1215118997, issued on 11/21/2007.
Does Thomas Warner prescribe more brand-name or generic drugs? ▼
Thomas Warner's prescribing is 17% brand-name and 82% generic drugs by claim count, with $112K in brand drug costs.
How many Medical Physician Assistant providers are there in the US? ▼
There are 40,580 Medical Physician Assistant providers across 55 states in the US. The average Medical Physician Assistant provider writes 1,077 Medicare Part D claims per year.
What drugs does Thomas Warner prescribe most often? ▼
Based on 2023 Medicare Part D data, Thomas Warner's most frequently prescribed drugs include Metformin Hcl, Atorvastatin Calcium, Gabapentin. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Thomas Warner accept Medicare? ▼
Thomas Warner appears in CMS Medicare data with 1,248 Part D claims and 147 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Thomas Warner's credentials? ▼
Thomas Warner's NPI is 1215118997. 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
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.