NPI registry status
Active
2026 NPPES data Anesthesiology Physician NPI 1548368459 MD
Verify on CMS → Robert Castro, MD
Anesthesiology Physician in Mayaguez, 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 56,432 in Anesthesiology 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
2K
Medicare Part D claims · 422 beneficiaries · Anesthesiology Physician avg: 860
Generic prescribing
96%
generic claims · 4% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$75.65
2 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
Robert Castro, MD filed 1,536 Medicare Part D claims in 2023 as a Anesthesiology Physician in Mayaguez, Puerto Rico, prescribing 96% generic.
- 2K
- Part D claims, 2023
- 96%
- generic prescribing
- $75.65
- 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.
Robert Castro, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
1,536 Top 19% higher than 81% 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)
Robert Castro, 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 Robert Castro, MD?
Quality data not reportedPrimary specialty
Anesthesiology Physician
Medicare Part D claims
1,536 79% vs specialty avg
Specialty distribution in Puerto Rico
How Anesthesiology 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 Anesthesiology 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).
Robert Castro, MD appears in the CMS NPPES registry as a Anesthesiology Physician provider holding MD credentials at CONDOMINIO LA PALMA PERAL #14, Mayaguez, PR, 00680, with a listed phone of (787) 834-2994. NPI 1548368459 was issued on 09/21/2006.
Medicare Part D records for calendar year 2023 show 1,536 prescription claims written by this provider, covering 422 Medicare beneficiaries and totaling roughly $20K in drug spend, split 4% brand-name and 96% generic by claim count, with an opioid prescribing rate of 32.1%.
Anesthesiology Physician is a high-volume specialty nationwide, with 56,432 enrolled providers across 56 states and an average of 860 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 | 1548368459 |
|---|---|
| Specialty | Anesthesiology Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 09/21/2006 |
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 Robert Castro, MD. Source: openpaymentsdata.cms.gov.
Total received
$76
Largest payer
Abbott Laboratories
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
Robert Castro, MD - brand share 4.0%
Anesthesiology Physician average
4% brand-name claims vs 96% generic, on 1,536 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.
1,536
Total Claims
$20K
Total Drug Cost
422
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 1,545
- Total Day Supply
- 36,239
- Brand vs Generic
- 4% brand / 96% generic
- Brand Drug Cost
- $4K
- Generic Drug Cost
- $15K
- Opioid Claims
- 493 (32.1% rate)
- Antibiotic Claims
- 21
Patient Demographics
- Average Patient Age
- 71.2 years
- Avg HCC Risk Score
- 2.00
- Gender Split
- 58% female / 42% male
- Age Distribution
- <65: 88, 65-74: 166, 75-84: 141, 85+: 27
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Robert Castro, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Tizanidine Hcl
Tizanidine Hcl
304 claims
- Gabapentin
Gabapentin
264 claims
- Meloxicam
Meloxicam
196 claims
- Hydrocodone-Acetam…
Hydrocodone-Acetaminophen
160 claims
- Hydrocodone-Ibupro… 84
Hydrocodone-Ibuprofen
84 claims
- Oxycodone-Acetamin… 74
Oxycodone-Acetaminophen
74 claims
- Tramadol Hcl 73
Tramadol Hcl
73 claims
- Tramadol Hcl-Aceta… 49
Tramadol Hcl-Acetaminophen
49 claims
| Drug | Claims |
|---|---|
| Tizanidine Hcl | 304 |
| Gabapentin | 264 |
| Meloxicam | 196 |
| Hydrocodone-Acetaminophen Hydrocodone/Acetaminophen | 160 |
| Hydrocodone-Ibuprofen Hydrocodone/Ibuprofen | 84 |
| Oxycodone-Acetaminophen Oxycodone Hcl/Acetaminophen | 74 |
| Tramadol Hcl | 73 |
| Tramadol Hcl-Acetaminophen Tramadol Hcl/Acetaminophen | 49 |
| Midazolam Hcl Midazolam Hcl/Pf | 45 |
| Fentanyl Citrate Fentanyl Citrate/Pf | 24 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Anesthesiology Physician Overview
How Robert Castro, MD fits within the Anesthesiology Physician landscape nationally.
56,432
Anesthesiology Physician Providers in US
56
States with Anesthesiology Physician
860
Avg Claims per Provider
Robert Castro, MD's 1,536 claims are above the specialty average of 860.
Nearby Anesthesiology 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.
Dr. Jorge Acevedo Orengo
M.D.
Aibonito, PR
Dr. Gabriel Altieri Acevedo
M.D.
San German, PR
Dr. Orlando Aponte
M.D.
San Juan, PR
Dr. Celso Arocho Irizarry
MD
Caguas, PR
Dr. John Arruza
MD
San Juan, PR
Compare Anesthesiology 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 Anesthesiology 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 Robert Castro, MD's specialty? ▼
Robert Castro, MD specializes in Anesthesiology Physician and practices in Mayaguez, Puerto Rico. Credentials: MD.
How much does Robert Castro, MD prescribe under Medicare Part D? ▼
In 2023, Robert Castro, MD wrote 1,536 Medicare Part D claims totaling $20K in drug costs for 422 beneficiaries.
Where is Robert Castro, MD located? ▼
Robert Castro, MD is located at CONDOMINIO LA PALMA PERAL #14, Mayaguez, PR, 00680. Phone: (787) 834-2994.
What is Robert Castro, MD's NPI number? ▼
Robert Castro, MD's National Provider Identifier (NPI) is 1548368459, issued on 09/21/2006.
Does Robert Castro, MD prescribe more brand-name or generic drugs? ▼
Robert Castro, MD's prescribing is 4% brand-name and 96% generic drugs by claim count, with $4K in brand drug costs.
Does Robert Castro, MD prescribe opioids? ▼
Yes, Robert Castro, MD had 493 opioid claims in 2023 with an opioid prescribing rate of 32.1%.
How many Anesthesiology Physician providers are there in the US? ▼
There are 56,432 Anesthesiology Physician providers across 56 states in the US. The average Anesthesiology Physician provider writes 860 Medicare Part D claims per year.
What drugs does Robert Castro, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Robert Castro, MD's most frequently prescribed drugs include Tizanidine Hcl, Gabapentin, Meloxicam. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Robert Castro, MD accept Medicare? ▼
Robert Castro, MD appears in CMS Medicare data with 1,536 Part D claims and 422 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Robert Castro, MD's credentials? ▼
Robert Castro, MD's NPI is 1548368459 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 (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.