NPI registry status
Active
2026 NPPES data Adult Medicine Physician NPI 1518973411 M.D.
Verify on CMS → Rafael Marrero, M.D.
Adult Medicine Physician 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 2,481 in Adult Medicine 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
14K
Medicare Part D claims · 571 beneficiaries · Adult Medicine Physician avg: 3K
Generic prescribing
86%
generic claims · 12% brand-name · higher generic rates reduce patient out-of-pocket costs
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
Rafael Marrero, M.D. filed 14,372 Medicare Part D claims in 2023 as a Adult Medicine Physician in Aibonito, Puerto Rico, prescribing 86% generic.
- 14K
- Part D claims, 2023
- 86%
- 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.
Rafael Marrero, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
14,372 Top 2% higher than 98% 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)
Rafael Marrero, M.D. 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 Rafael Marrero, M.D.?
Quality data not reportedPrimary specialty
Adult Medicine Physician
Medicare Part D claims
14,372 5× vs specialty avg
Specialty distribution in Puerto Rico
How Adult Medicine 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 Adult Medicine 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).
Rafael Marrero, M.D. appears in the CMS NPPES registry as a Adult Medicine Physician provider holding M.D. credentials at CALLE PEDRO ROSARIO NUM.20, Aibonito, PR, 00705, with a listed phone of (787) 735-1075. NPI 1518973411 was issued on 07/31/2006.
Medicare Part D records for calendar year 2023 show 14,372 prescription claims written by this provider, covering 571 Medicare beneficiaries and totaling roughly $641K in drug spend, split 12% brand-name and 86% generic by claim count, with an opioid prescribing rate of 1.5%.
Adult Medicine Physician is a narrow specialty nationwide, with 2,481 enrolled providers across 52 states and an average of 2,807 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 | 1518973411 |
|---|---|
| Specialty | Adult Medicine Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 07/31/2006 |
Brand vs generic prescribing mix · Typical
Rafael Marrero, M.D. - brand share 12.0%
Adult Medicine Physician average
12% brand-name claims vs 86% generic, on 14,372 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.
14,372
Total Claims
$641K
Total Drug Cost
571
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 23,125
- Total Day Supply
- 672,607
- Brand vs Generic
- 12% brand / 86% generic
- Brand Drug Cost
- $476K
- Generic Drug Cost
- $158K
- Opioid Claims
- 222 (1.5% rate)
- Antibiotic Claims
- 296
Patient Demographics
- Average Patient Age
- 73.3 years
- Avg HCC Risk Score
- 1.82
- Gender Split
- 57% female / 43% male
- Age Distribution
- <65: 105, 65-74: 181, 75-84: 203, 85+: 82
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Rafael Marrero, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Levothyroxine Sodium
Levothyroxine Sodium
996 claims
- Gabapentin
Gabapentin
672 claims
- Simvastatin
Simvastatin
556 claims
- Alendronate Sodium
Alendronate Sodium
493 claims
- Metformin Hcl
Metformin Hcl
460 claims
- Losartan Potassium
Losartan Potassium
410 claims
- Lisinopril 394
Lisinopril
394 claims
- Synthroid 368
Synthroid
368 claims
| Drug | Claims |
|---|---|
| Levothyroxine Sodium | 996 |
| Gabapentin | 672 |
| Simvastatin | 556 |
| Alendronate Sodium | 493 |
| Metformin Hcl | 460 |
| Losartan Potassium | 410 |
| Lisinopril | 394 |
| Synthroid Levothyroxine Sodium | 368 |
| Atorvastatin Calcium | 363 |
| Clonazepam | 312 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Adult Medicine Physician Overview
How Rafael Marrero, M.D. fits within the Adult Medicine Physician landscape nationally.
2,481
Adult Medicine Physician Providers in US
52
States with Adult Medicine Physician
2,807
Avg Claims per Provider
Rafael Marrero, M.D.'s 14,372 claims are above the specialty average of 2,807.
Nearby Adult Medicine Physician Providers in Puerto Rico
Other clinicians with the same primary specialty enrolled in Puerto Rico, drawn from the same CMS NPPES roster as Marrero.
Dr. Esperanza Alvarez Rosales
MD
Arecibo, PR
Dr. Nestor Amador-Chacon
MD
Manati, PR
Dr. Carlos Bujosa
M.D.
Guaynabo, PR
Dr. Julio Luis Cadiz Velazquez
M.D
Ponce, PR
Dr. Oreste Castellanos
M.D.
Mayaguez, PR
Compare Adult Medicine 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 Puerto Rico medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Adult Medicine 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 Rafael Marrero, M.D.'s specialty? ▼
Rafael Marrero, M.D. specializes in Adult Medicine Physician and practices in Aibonito, Puerto Rico. Credentials: M.D..
How much does Rafael Marrero, M.D. prescribe under Medicare Part D? ▼
In 2023, Rafael Marrero, M.D. wrote 14,372 Medicare Part D claims totaling $641K in drug costs for 571 beneficiaries.
Where is Rafael Marrero, M.D. located? ▼
Rafael Marrero, M.D. is located at CALLE PEDRO ROSARIO NUM.20, Aibonito, PR, 00705. Phone: (787) 735-1075.
What is Rafael Marrero, M.D.'s NPI number? ▼
Rafael Marrero, M.D.'s National Provider Identifier (NPI) is 1518973411, issued on 07/31/2006.
Does Rafael Marrero, M.D. prescribe more brand-name or generic drugs? ▼
Rafael Marrero, M.D.'s prescribing is 12% brand-name and 86% generic drugs by claim count, with $476K in brand drug costs.
Does Rafael Marrero, M.D. prescribe opioids? ▼
Yes, Rafael Marrero, M.D. had 222 opioid claims in 2023 with an opioid prescribing rate of 1.5%.
How many Adult Medicine Physician providers are there in the US? ▼
There are 2,481 Adult Medicine Physician providers across 52 states in the US. The average Adult Medicine Physician provider writes 2,807 Medicare Part D claims per year.
What drugs does Rafael Marrero, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Rafael Marrero, M.D.'s most frequently prescribed drugs include Levothyroxine Sodium, Gabapentin, Simvastatin. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Rafael Marrero, M.D. accept Medicare? ▼
Rafael Marrero, M.D. appears in CMS Medicare data with 14,372 Part D claims and 571 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Rafael Marrero, M.D.'s credentials? ▼
Rafael Marrero, M.D.'s NPI is 1518973411 with credentials M.D.. 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.