NPI registry status
Active
2026 NPPES data General Practice Physician NPI 1679769897 PA-C
Verify on CMS → Miguel Castuera, PA-C
General Practice Physician in Montclair, 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 16,725 in General Practice Physician, 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
6K
Medicare Part D claims · 301 beneficiaries · General Practice Physician avg: 3K
Generic prescribing
82%
generic claims · 15% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$405.23
22 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
Miguel Castuera, PA-C filed 6,361 Medicare Part D claims in 2023 as a General Practice Physician in Montclair, California, prescribing 82% generic.
- 6K
- Part D claims, 2023
- 82%
- generic prescribing
- $405.23
- 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.
Miguel Castuera, PA-C's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
6,361 Top 4% higher than 96% 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
◑
Board-eligible specialty (heuristic, not verified)
Miguel Castuera, PA-C practices in an ABMS-board-eligible specialty but we don't have enough CMS-participation signals to confirm active board-certified status. Consult CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Miguel Castuera, PA-C?
Quality data not reportedPrimary specialty
General Practice Physician
Medicare Part D claims
6,361 121% vs specialty avg
Specialty distribution in California
How General Practice Physician 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 General Practice Physician. 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).
Miguel Castuera, PA-C appears in the CMS NPPES registry as a General Practice Physician provider holding PA-C credentials at 4451 HOLT BLVD, Montclair, CA, 91763, with a listed phone of (909) 624-3033. NPI 1679769897 was issued on 09/20/2007.
Medicare Part D records for calendar year 2023 show 6,361 prescription claims written by this provider, covering 301 Medicare beneficiaries and totaling roughly $730K in drug spend, split 15% brand-name and 82% generic by claim count, with an opioid prescribing rate of 0.9%.
General Practice Physician is a mid-sized specialty nationwide, with 16,725 enrolled providers across 56 states and an average of 2,872 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 | 1679769897 |
|---|---|
| Specialty | General Practice Physician |
| Credentials | PA-C |
| Gender | Male |
| NPI Issued | 09/20/2007 |
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 Miguel Castuera, PA-C. Source: openpaymentsdata.cms.gov.
Total received
$405
Largest payer
Boehringer Ingelheim 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 Miguel Castuera, PA-C. To verify Miguel Castuera, PA-C'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
Miguel Castuera, PA-C - brand share 15.0%
General Practice Physician average
15% brand-name claims vs 82% generic, on 6,361 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.
6,361
Total Claims
$730K
Total Drug Cost
301
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 12,222
- Total Day Supply
- 352,554
- Brand vs Generic
- 15% brand / 82% generic
- Brand Drug Cost
- $622K
- Generic Drug Cost
- $99K
- Opioid Claims
- 57 (0.9% rate)
- Antibiotic Claims
- 154
Patient Demographics
- Average Patient Age
- 73.0 years
- Avg HCC Risk Score
- 1.24
- Gender Split
- 55% female / 45% male
- Age Distribution
- <65: 31, 65-74: 152, 75-84: 84, 85+: 34
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Miguel Castuera, PA-C prescribes most
Top Medicare Part D drugs by claim count, 2023
- Atorvastatin Calcium
Atorvastatin Calcium
447 claims
- Metformin Hcl
Metformin Hcl
323 claims
- Alendronate Sodium
Alendronate Sodium
277 claims
- Montelukast Sodium
Montelukast Sodium
277 claims
- Levothyroxine Sodium
Levothyroxine Sodium
226 claims
- Gabapentin
Gabapentin
212 claims
- Omeprazole
Omeprazole
204 claims
- Amlodipine Besylate
Amlodipine Besylate
197 claims
| Drug | Claims |
|---|---|
| Atorvastatin Calcium | 447 |
| Metformin Hcl | 323 |
| Alendronate Sodium | 277 |
| Montelukast Sodium | 277 |
| Levothyroxine Sodium | 226 |
| Gabapentin | 212 |
| Omeprazole | 204 |
| Amlodipine Besylate | 197 |
| Escitalopram Oxalate | 172 |
| Losartan Potassium | 127 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
General Practice Physician Overview
How Miguel Castuera, PA-C fits within the General Practice Physician landscape nationally.
16,725
General Practice Physician Providers in US
56
States with General Practice Physician
2,872
Avg Claims per Provider
Miguel Castuera, PA-C's 6,361 claims are above the specialty average of 2,872.
Nearby General Practice Physician Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Castuera.
Dr. Dalal Aago
MD
El Cajon, CA
Dr. Hessam Aazami
M.D.
Canoga Park, CA
Dr. Kenric Aban
M.D.
Oceanside, CA
Dr. Tahira Abbasi
MD
La Jolla, CA
Dr. Ryan Abbott
M.D.
Los Angeles, CA
Compare General Practice Physician 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 General Practice Physician 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 Miguel Castuera, PA-C's specialty? ▼
Miguel Castuera, PA-C specializes in General Practice Physician and practices in Montclair, California. Credentials: PA-C.
How much does Miguel Castuera, PA-C prescribe under Medicare Part D? ▼
In 2023, Miguel Castuera, PA-C wrote 6,361 Medicare Part D claims totaling $730K in drug costs for 301 beneficiaries.
Where is Miguel Castuera, PA-C located? ▼
Miguel Castuera, PA-C is located at 4451 HOLT BLVD, Montclair, CA, 91763. Phone: (909) 624-3033.
What is Miguel Castuera, PA-C's NPI number? ▼
Miguel Castuera, PA-C's National Provider Identifier (NPI) is 1679769897, issued on 09/20/2007.
Does Miguel Castuera, PA-C prescribe more brand-name or generic drugs? ▼
Miguel Castuera, PA-C's prescribing is 15% brand-name and 82% generic drugs by claim count, with $622K in brand drug costs.
Does Miguel Castuera, PA-C prescribe opioids? ▼
Yes, Miguel Castuera, PA-C had 57 opioid claims in 2023 with an opioid prescribing rate of 0.9%.
How many General Practice Physician providers are there in the US? ▼
There are 16,725 General Practice Physician providers across 56 states in the US. The average General Practice Physician provider writes 2,872 Medicare Part D claims per year.
What drugs does Miguel Castuera, PA-C prescribe most often? ▼
Based on 2023 Medicare Part D data, Miguel Castuera, PA-C's most frequently prescribed drugs include Atorvastatin Calcium, Metformin Hcl, Alendronate Sodium. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Miguel Castuera, PA-C accept Medicare? ▼
Miguel Castuera, PA-C appears in CMS Medicare data with 6,361 Part D claims and 301 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Miguel Castuera, PA-C's credentials? ▼
Miguel Castuera, PA-C's NPI is 1679769897 with credentials PA-C. 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.