NPI registry status
Active
2026 NPPES data General Practice Physician NPI 1780646786 MD
Verify on CMS → Samuel Castro-Rivera, MD
General Practice Physician in Bayamon, 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 16,838 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
10K
Medicare Part D claims · 570 beneficiaries · General Practice Physician avg: 3K
Generic prescribing
87%
generic claims · 12% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$119.11
1 payments · CMS Open Payments (Sunshine Act)
Source: CMS Medicare Part D Prescriber Public Use File, 2024
What the federal data shows
Samuel Castro-Rivera, MD filed 9,501 Medicare Part D claims in 2024 as a General Practice Physician in Bayamon, Puerto Rico, prescribing 87% generic.
- 10K
- Part D claims, 2024
- 87%
- generic prescribing
- $119.11
- industry payments (Sunshine Act)
- ≥98th
- pct by Part D claim volume (lower-bound band)
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.
Federal trust snapshot
What official records show about Samuel Castro-Rivera, MD
Federal records show an active NPI with Medicare Part D prescribing activity — verifiable registry data, not a proprietary rating.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1780646786), first enumerated 04/05/2006.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 9,501 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- Reported
Board certification signal
Practices in an ABMS-board-eligible specialty; board certification not confirmed in federal records.
- Reported
Industry payment transparency
$119.11 in reported industry payments (1 transfers) in 2024 under the federal Sunshine Act — disclosed transfers of value, not a quality rating.
Source: CMS Open Payments
- Not in federal data
Individual sanction lookup
PlainDoctor does not publish per-provider disciplinary determinations. Confirm current license and any individual actions through the state medical board or FSMB verification service.
Source: State medical board / FSMB
This trust snapshot summarizes only what appears in federal CMS/NPPES public records. It is not a composite score, star rating, patient review, or clinical recommendation. PlainDoctor never fabricates reviews or AggregateRating schema.
CMS NPPES provider registry desk
NPI 1780646786 · General Practice Physician
NPI-10 · ENUM-LEGACY · TAX-MID · RX-MID · BOOK-LIGHT · PHOTO-ENUM
- NPI-10 1780646786
- ENUM-LEGACY 2006
- TAX-MID 17K General Practice
- RX-MID 9,501
- BOOK-LIGHT 3,970 in Puerto Rico
- PHOTO-ENUM Paul Chung, M.D. · 2006
Samuel Castro-Rivera, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2024, across all CMS prescribers nationally
9,501 ≥ 98th percentile 98% of 1,416,883 prescribers are in lower value bands
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.
The percentile is a conservative 100-claim band: it counts only prescribers in lower claim-volume bands. Medicare Part D claim volume is activity context, not a quality measure or recommendation. See methodology § corpus placement.
Source CMS Medicare Part D Prescriber Public Use File · 2024
◑
Board-eligible specialty (heuristic, not verified)
Samuel Castro-Rivera, MD 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 Samuel Castro-Rivera, MD?
Quality data not reportedPrimary specialty
General Practice Physician
Medicare Part D claims
9,501 221% vs specialty avg
Specialty distribution in Puerto Rico
How General Practice Physician 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 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).
Practice Address
Provider Details
| NPI | 1780646786 |
|---|---|
| Specialty | General Practice Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 04/05/2006 |
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 Samuel Castro-Rivera, MD. Source: openpaymentsdata.cms.gov.
Total received
$119
Largest payer
E.R. Squibb & Sons, L.L.C.
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 · Typical
Samuel Castro-Rivera, MD - brand share 12.0%
General Practice Physician average
12% brand-name claims vs 87% generic, on 9,501 2024 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 2024.
9,501
Total Claims
$803K
Total Drug Cost
570
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 23,167.733
- Total Day Supply
- 678,825
- Brand vs Generic
- 12% brand / 87% generic
- Brand Drug Cost
- $585K
- Generic Drug Cost
- $216K
- Opioid Claims
- 51 (0.5% rate)
- Antibiotic Claims
- 128
Patient Demographics
- Average Patient Age
- 75.1 years
- Avg HCC Risk Score
- 1.47
- Gender Split
- 58% female / 42% male
- Age Distribution
- <65: 46, 65-74: 204, 75-84: 248, 85+: 72
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What Samuel Castro-Rivera, MD prescribes most
Top Medicare Part D drugs by claim count, 2024
- Atorvastatin Calcium
Atorvastatin Calcium
1,003 claims
- Levothyroxine Sodium
Levothyroxine Sodium
462 claims
- Amlodipine Besylate
Amlodipine Besylate
450 claims
- Losartan Potassium 280
Losartan Potassium
280 claims
- Metformin Hcl 266
Metformin Hcl
266 claims
- Rosuvastatin Calcium 266
Rosuvastatin Calcium
266 claims
- Synthroid 257
Synthroid
257 claims
- Metoprolol Succinate 253
Metoprolol Succinate
253 claims
| Drug | Claims |
|---|---|
| Atorvastatin Calcium | 1,003 |
| Levothyroxine Sodium | 462 |
| Amlodipine Besylate | 450 |
| Losartan Potassium | 280 |
| Metformin Hcl | 266 |
| Rosuvastatin Calcium | 266 |
| Synthroid Levothyroxine Sodium | 257 |
| Metoprolol Succinate | 253 |
| Ezetimibe | 240 |
| Gabapentin | 227 |
* 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 Samuel Castro-Rivera, MD fits within the General Practice Physician landscape nationally.
16,838
General Practice Physician Providers in US
56
States with General Practice Physician
2,957
Avg Claims per Provider
Samuel Castro-Rivera, MD's 9,501 claims are above the specialty average of 2,957.
Nationwide General Practice Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Castro-Rivera, both outside Puerto Rico so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2006)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby General Practice Physician Providers in Puerto Rico
Other clinicians with the same primary specialty enrolled in Puerto Rico, drawn from the same CMS NPPES roster as Castro-Rivera.
One of 3,970 General Practice Physician providers enrolled in Puerto Rico, 5 are shown here.
Dr. Veronica Abraham
MD
Bayamon, PR
Dr. Manuel Abraham Gonzalez
M.D.
San Juan, PR
Dr. Jennifer Abraham Vega
MD
San Juan, PR
Dr. Jose M. Abreu Guzman
M.D.
Manati, PR
Dr. Steven Abreu Reyes
M.D.
Las Piedras, PR
Compare General Practice Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Samuel Castro-Rivera, MD's specialty? ▼
Samuel Castro-Rivera, MD specializes in General Practice Physician and practices in Bayamon, Puerto Rico. Credentials: MD.
How much does Samuel Castro-Rivera, MD prescribe under Medicare Part D? ▼
In 2024, Samuel Castro-Rivera, MD wrote 9,501 Medicare Part D claims totaling $803K in drug costs for 570 beneficiaries.
Where is Samuel Castro-Rivera, MD located? ▼
Samuel Castro-Rivera, MD is located at 34-1 CALLE 43, Bayamon, PR, 00957. Phone: (787) 797-5365.
What is Samuel Castro-Rivera, MD's NPI number? ▼
Samuel Castro-Rivera, MD's National Provider Identifier (NPI) is 1780646786, issued on 04/05/2006.
Does Samuel Castro-Rivera, MD prescribe more brand-name or generic drugs? ▼
Samuel Castro-Rivera, MD's prescribing is 12% brand-name and 87% generic drugs by claim count, with $585K in brand drug costs.
Does Samuel Castro-Rivera, MD prescribe opioids? ▼
Yes, Samuel Castro-Rivera, MD had 51 opioid claims in 2024 with an opioid prescribing rate of 0.5%.
How many General Practice Physician providers are there in the US? ▼
There are 16,838 General Practice Physician providers across 56 states in the US. The average General Practice Physician provider writes 2,957 Medicare Part D claims per year.
What drugs does Samuel Castro-Rivera, MD prescribe most often? ▼
Based on 2024 Medicare Part D data, Samuel Castro-Rivera, MD's most frequently prescribed drugs include Atorvastatin Calcium, Levothyroxine Sodium, Amlodipine Besylate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Samuel Castro-Rivera, MD accept Medicare? ▼
Samuel Castro-Rivera, MD appears in CMS Medicare data with 9,501 Part D claims and 570 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Samuel Castro-Rivera, MD's credentials? ▼
Samuel Castro-Rivera, MD's NPI is 1780646786 with credentials MD. 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 (2024). 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 August 2026 (NPPES) / 2024 (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 August 2026.