NPI registry status
Active
2026 NPPES data Specialist NPI 1609875335
Verify on CMS → Jose Castro Diaz
Specialist in Aibonito, Puerto Rico.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 69,658 in 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
404
Medicare Part D claims · 105 beneficiaries · Specialist avg: 1K
Generic prescribing
93%
generic claims · 7% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$128.13
1 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
Jose Castro Diaz filed 404 Medicare Part D claims in 2023 as a Specialist in Aibonito, Puerto Rico, prescribing 93% generic.
- 404
- Part D claims, 2023
- 93%
- generic prescribing
- $128.13
- 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.
Jose Castro Diaz's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
404 Top 38% higher than 62% 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 Jose Castro Diaz?
Quality data not reportedPrimary specialty
Specialist
Medicare Part D claims
404 73% vs specialty avg
Specialty distribution in Puerto Rico
How Specialist compares to other specialties among Puerto Rico 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 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).
Jose Castro Diaz appears in the CMS NPPES registry as a Specialist provider at EDIFICION PROFESSIONAL, 301 HOSPITAL MEMOMITA, Aibonito, PR, 00705, with a listed phone of (787) 735-7500. NPI 1609875335 was issued on 07/15/2005.
Medicare Part D records for calendar year 2023 show 404 prescription claims written by this provider, covering 105 Medicare beneficiaries and totaling roughly $277K in drug spend, split 7% brand-name and 93% generic by claim count.
Specialist is a high-volume specialty nationwide, with 69,658 enrolled providers across 55 states and an average of 1,474 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 | 1609875335 |
|---|---|
| Specialty | Specialist |
| Gender | Male |
| NPI Issued | 07/15/2005 |
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 Jose Castro Diaz. Source: openpaymentsdata.cms.gov.
Total received
$128
Largest payer
Teleflex LLC
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.
Brand vs generic prescribing mix · Generic-heavy
Jose Castro Diaz - brand share 7.0%
Specialist average
7% brand-name claims vs 93% generic, on 404 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.
404
Total Claims
$277K
Total Drug Cost
105
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 412
- Total Day Supply
- 11,369
- Brand vs Generic
- 7% brand / 93% generic
- Brand Drug Cost
- $272K
- Generic Drug Cost
- $5K
- Antibiotic Claims
- 70
Patient Demographics
- Average Patient Age
- 73.1 years
- Avg HCC Risk Score
- 1.87
- Age Distribution
- <65: 18, 65-74: 40, 75-84: 31, 85+: 16
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Jose Castro Diaz prescribes most
Top Medicare Part D drugs by claim count, 2023
- Tamsulosin Hcl
Tamsulosin Hcl
166 claims
- Oxybutynin Chloride
Oxybutynin Chloride
76 claims
- Sulfamethoxazole-T… 56
Sulfamethoxazole-Trimethoprim
56 claims
- Tolterodine Tartra… 35
Tolterodine Tartrate Er
35 claims
- Erleada 20
Erleada
20 claims
| Drug | Claims |
|---|---|
| Tamsulosin Hcl | 166 |
| Oxybutynin Chloride | 76 |
| Sulfamethoxazole-Trimethoprim Sulfamethoxazole/Trimethoprim | 56 |
| Tolterodine Tartrate Er Tolterodine Tartrate | 35 |
| Erleada Apalutamide | 20 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Specialist Overview
How Jose Castro Diaz fits within the Specialist landscape nationally.
69,658
Specialist Providers in US
55
States with Specialist
1,474
Avg Claims per Provider
Jose Castro Diaz's 404 claims are below the specialty average of 1,474.
Nearby Specialist Providers in Puerto Rico
Other clinicians with the same primary specialty enrolled in Puerto Rico, drawn from the same CMS NPPES roster as Castro Diaz.
Dr. Alberto Abreu
M.D.
Ponce, PR
Dr. Arlene Abreu Rivera
MD
Caguas, PR
Dr. Alberto Abreu-Rivera
M.D. FAMILY PHYSICIA
Arecibo, PR
Dr. Carmen Acantilado
M.D.
Bayamon, PR
Dr. Frank Acevedo
M.D.
Cayey, PR
Compare Specialist 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 Puerto Rico medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby 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.
Healthcare Guides
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How to Find a Doctor
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Medical Specialties Explained
Who treats what and how specialties differ
Understanding Medicare Claims Data
What prescribing data reveals about a provider
In-Network vs Out-of-Network
How insurance networks affect your costs
Telehealth Guide
Virtual care options and coverage in 2026
Explore Puerto Rico
Frequently Asked Questions
What is Jose Castro Diaz's specialty? ▼
Jose Castro Diaz specializes in Specialist and practices in Aibonito, Puerto Rico.
How much does Jose Castro Diaz prescribe under Medicare Part D? ▼
In 2023, Jose Castro Diaz wrote 404 Medicare Part D claims totaling $277K in drug costs for 105 beneficiaries.
Where is Jose Castro Diaz located? ▼
Jose Castro Diaz is located at EDIFICION PROFESSIONAL, 301 HOSPITAL MEMOMITA, Aibonito, PR, 00705. Phone: (787) 735-7500.
What is Jose Castro Diaz's NPI number? ▼
Jose Castro Diaz's National Provider Identifier (NPI) is 1609875335, issued on 07/15/2005.
Does Jose Castro Diaz prescribe more brand-name or generic drugs? ▼
Jose Castro Diaz's prescribing is 7% brand-name and 93% generic drugs by claim count, with $272K in brand drug costs.
How many Specialist providers are there in the US? ▼
There are 69,658 Specialist providers across 55 states in the US. The average Specialist provider writes 1,474 Medicare Part D claims per year.
What drugs does Jose Castro Diaz prescribe most often? ▼
Based on 2023 Medicare Part D data, Jose Castro Diaz's most frequently prescribed drugs include Tamsulosin Hcl, Oxybutynin Chloride, Sulfamethoxazole-Trimethoprim. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Jose Castro Diaz accept Medicare? ▼
Jose Castro Diaz appears in CMS Medicare data with 404 Part D claims and 105 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Jose Castro Diaz's credentials? ▼
Jose Castro Diaz's NPI is 1609875335. 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.