NPI registry status
Active
2026 NPPES data General Practice Physician NPI 1194772640 M.D.
Verify on CMS → Marcos Ayala Rivera, M.D.
General Practice 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 16,677 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
9K
Medicare Part D claims · 292 beneficiaries · General Practice Physician avg: 3K
Generic prescribing
87%
generic claims · 11% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$314.39
3 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
Marcos Ayala Rivera, M.D. filed 8,844 Medicare Part D claims in 2023 as a General Practice Physician in Mayaguez, Puerto Rico, prescribing 87% generic.
- 9K
- Part D claims, 2023
- 87%
- generic prescribing
- $314.39
- 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.
Marcos Ayala Rivera, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
8,844 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
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Board-eligible specialty (heuristic, not verified)
Marcos Ayala Rivera, 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 Marcos Ayala Rivera, M.D.?
Quality data not reportedPrimary specialty
General Practice Physician
Medicare Part D claims
8,844 208% 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).
Marcos Ayala Rivera, M.D. appears in the CMS NPPES registry as a General Practice Physician provider holding M.D. credentials at 167E CALLE RAMOS ANTONINI, Mayaguez, PR, 00680, with a listed phone of (787) 833-5235. NPI 1194772640 was issued on 05/30/2006.
Medicare Part D records for calendar year 2023 show 8,844 prescription claims written by this provider, covering 292 Medicare beneficiaries and totaling roughly $284K in drug spend, split 11% brand-name and 87% generic by claim count.
General Practice Physician is a mid-sized specialty nationwide, with 16,677 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 | 1194772640 |
|---|---|
| Specialty | General Practice Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 05/30/2006 |
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 Marcos Ayala Rivera, M.D.. Source: openpaymentsdata.cms.gov.
Total received
$314
Largest payer
AstraZeneca Pharmaceuticals LP
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
Marcos Ayala Rivera, M.D. - brand share 11.0%
General Practice Physician average
11% brand-name claims vs 87% generic, on 8,844 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.
8,844
Total Claims
$284K
Total Drug Cost
292
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 15,948
- Total Day Supply
- 465,375
- Brand vs Generic
- 11% brand / 87% generic
- Brand Drug Cost
- $180K
- Generic Drug Cost
- $99K
- Antibiotic Claims
- 72
Patient Demographics
- Average Patient Age
- 73.0 years
- Avg HCC Risk Score
- 2.70
- Gender Split
- 54% female / 46% male
- Age Distribution
- <65: 27, 65-74: 151, 75-84: 84, 85+: 30
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Marcos Ayala Rivera, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Atorvastatin Calcium
Atorvastatin Calcium
623 claims
- Losartan Potassium
Losartan Potassium
598 claims
- Gabapentin
Gabapentin
437 claims
- Omeprazole
Omeprazole
397 claims
- Synthroid
Synthroid
392 claims
- Metoprolol Succinate
Metoprolol Succinate
363 claims
- Montelukast Sodium
Montelukast Sodium
352 claims
- Famotidine
Famotidine
304 claims
| Drug | Claims |
|---|---|
| Atorvastatin Calcium | 623 |
| Losartan Potassium | 598 |
| Gabapentin | 437 |
| Omeprazole | 397 |
| Synthroid Levothyroxine Sodium | 392 |
| Metoprolol Succinate | 363 |
| Montelukast Sodium | 352 |
| Famotidine | 304 |
| Metformin Hcl | 282 |
| Alendronate Sodium | 267 |
* 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 Marcos Ayala Rivera, M.D. fits within the General Practice Physician landscape nationally.
16,677
General Practice Physician Providers in US
56
States with General Practice Physician
2,872
Avg Claims per Provider
Marcos Ayala Rivera, M.D.'s 8,844 claims are above the specialty average of 2,872.
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 Ayala Rivera.
Dr. Veronica Abraham
MD
San Juan, 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 →
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 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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Medical Specialties Explained
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How insurance networks affect your costs
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Frequently Asked Questions
What is Marcos Ayala Rivera, M.D.'s specialty? ▼
Marcos Ayala Rivera, M.D. specializes in General Practice Physician and practices in Mayaguez, Puerto Rico. Credentials: M.D..
How much does Marcos Ayala Rivera, M.D. prescribe under Medicare Part D? ▼
In 2023, Marcos Ayala Rivera, M.D. wrote 8,844 Medicare Part D claims totaling $284K in drug costs for 292 beneficiaries.
Where is Marcos Ayala Rivera, M.D. located? ▼
Marcos Ayala Rivera, M.D. is located at 167E CALLE RAMOS ANTONINI, Mayaguez, PR, 00680. Phone: (787) 833-5235.
What is Marcos Ayala Rivera, M.D.'s NPI number? ▼
Marcos Ayala Rivera, M.D.'s National Provider Identifier (NPI) is 1194772640, issued on 05/30/2006.
Does Marcos Ayala Rivera, M.D. prescribe more brand-name or generic drugs? ▼
Marcos Ayala Rivera, M.D.'s prescribing is 11% brand-name and 87% generic drugs by claim count, with $180K in brand drug costs.
How many General Practice Physician providers are there in the US? ▼
There are 16,677 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 Marcos Ayala Rivera, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Marcos Ayala Rivera, M.D.'s most frequently prescribed drugs include Atorvastatin Calcium, Losartan Potassium, Gabapentin. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Marcos Ayala Rivera, M.D. accept Medicare? ▼
Marcos Ayala Rivera, M.D. appears in CMS Medicare data with 8,844 Part D claims and 292 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Marcos Ayala Rivera, M.D.'s credentials? ▼
Marcos Ayala Rivera, M.D.'s NPI is 1194772640 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.