NPI registry status
Active
2026 NPPES data Nephrology Physician NPI 1861598039 MD
Verify on CMS → Oliver Guerrero Dujarric, MD
Nephrology 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 10,534 in Nephrology 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
1K
Medicare Part D claims · 242 beneficiaries · Nephrology Physician avg: 1K
Industry payments
$504.48
10 payments · CMS Open Payments (Sunshine Act)
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Oliver Guerrero Dujarric, MD filed 1,154 Medicare Part D claims in 2023 as a Nephrology Physician in Mayaguez, Puerto Rico.
- 1K
- Part D claims, 2023
- Likely
- board-certified (heuristic)
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.
Oliver Guerrero Dujarric, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
1,154 Top 23% higher than 77% 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 certification likely (heuristic, not verified)
Oliver Guerrero Dujarric, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 1 hospital affiliation - signals consistent with board-certified status. For verified board certification, see CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Oliver Guerrero Dujarric, MD?
Quality data not reportedPrimary specialty
Nephrology Physician
Medicare Part D claims
1,154 21% vs specialty avg
Specialty distribution in Puerto Rico
How Nephrology 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 Nephrology 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).
Oliver Guerrero Dujarric, MD appears in the CMS NPPES registry as a Nephrology Physician provider holding MD credentials at 1050 LOS CORAZONES AVE, Mayaguez, PR, 00680, with a listed phone of (787) 834-5334. NPI 1861598039 was issued on 09/15/2006.
Medicare Part D records for calendar year 2023 show 1,154 prescription claims written by this provider, covering 242 Medicare beneficiaries and totaling roughly $166K in drug spend, with an opioid prescribing rate of 1.0%.
Nephrology Physician is a mid-sized specialty nationwide, with 10,534 enrolled providers across 55 states and an average of 1,454 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 | 1861598039 |
|---|---|
| Specialty | Nephrology Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 09/15/2006 |
Hospital and facility affiliations
Facilities where Oliver Guerrero Dujarric, MD bills Medicare from. Star ratings (1-5) are CMS Hospital Compare's "Hospital overall rating" - a composite of mortality, readmission, patient experience, safety, timely care, and efficient use of medical imaging measures. Source: CMS Care Compare.
Nefrologos Asociados Del Oeste
San German, PR
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
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 Oliver Guerrero Dujarric, MD. Source: openpaymentsdata.cms.gov.
Total received
$504
Largest payer
Amgen Inc.
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.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
1,154
Total Claims
$166K
Total Drug Cost
242
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 1,249
- Total Day Supply
- 35,956
- Generic Drug Cost
- $88K
- Opioid Claims
- 12 (1.0% rate)
- Antibiotic Claims
- 32
Patient Demographics
- Average Patient Age
- 68.1 years
- Avg HCC Risk Score
- 6.82
- Gender Split
- 43% female / 57% male
- Age Distribution
- <65: 81, 65-74: 76, 75-84: 72, 85+: 13
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Oliver Guerrero Dujarric, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Sevelamer Carbonate
Sevelamer Carbonate
210 claims
- Lanthanum Carbonate
Lanthanum Carbonate
97 claims
- Doxazosin Mesylate 71
Doxazosin Mesylate
71 claims
- Losartan Potassium 60
Losartan Potassium
60 claims
- Farxiga 55
Farxiga
55 claims
- Calcitriol 49
Calcitriol
49 claims
- Carvedilol 39
Carvedilol
39 claims
- Hydralazine Hcl 34
Hydralazine Hcl
34 claims
| Drug | Claims |
|---|---|
| Sevelamer Carbonate | 210 |
| Lanthanum Carbonate | 97 |
| Doxazosin Mesylate | 71 |
| Losartan Potassium | 60 |
| Farxiga Dapagliflozin Propanediol | 55 |
| Calcitriol | 49 |
| Carvedilol | 39 |
| Hydralazine Hcl | 34 |
| Atorvastatin Calcium | 30 |
| Famotidine | 28 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Nephrology Physician Overview
How Oliver Guerrero Dujarric, MD fits within the Nephrology Physician landscape nationally.
10,534
Nephrology Physician Providers in US
55
States with Nephrology Physician
1,454
Avg Claims per Provider
Oliver Guerrero Dujarric, MD's 1,154 claims are below the specialty average of 1,454.
Nearby Nephrology Physician Providers in Puerto Rico
Other clinicians with the same primary specialty enrolled in Puerto Rico, drawn from the same CMS NPPES roster as Guerrero Dujarric.
Dr. Marco Albarran Portilla
MD
Ponce, PR
Dr. Praxedes Alvarez
M.D.
Ponce, PR
Dr. Sergio Alvarez Torres
M.D
Adjuntas, PR
Dr. Krystahl Andujar-Rivera
MD
Carolina, PR
Dr. Alberto Arevalo Roig
MD
Arecibo, PR
Compare Nephrology 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 Nephrology 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.
Healthcare Guides
Learn more about finding, verifying, and understanding healthcare providers.
How to Find a Doctor
Step-by-step guide to choosing a provider
Verify Credentials
Check NPI, board certification & license status
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 Oliver Guerrero Dujarric, MD's specialty? ▼
Oliver Guerrero Dujarric, MD specializes in Nephrology Physician and practices in Mayaguez, Puerto Rico. Credentials: MD.
How much does Oliver Guerrero Dujarric, MD prescribe under Medicare Part D? ▼
In 2023, Oliver Guerrero Dujarric, MD wrote 1,154 Medicare Part D claims totaling $166K in drug costs for 242 beneficiaries.
Where is Oliver Guerrero Dujarric, MD located? ▼
Oliver Guerrero Dujarric, MD is located at 1050 LOS CORAZONES AVE, Mayaguez, PR, 00680. Phone: (787) 834-5334.
What is Oliver Guerrero Dujarric, MD's NPI number? ▼
Oliver Guerrero Dujarric, MD's National Provider Identifier (NPI) is 1861598039, issued on 09/15/2006.
Does Oliver Guerrero Dujarric, MD prescribe opioids? ▼
Yes, Oliver Guerrero Dujarric, MD had 12 opioid claims in 2023 with an opioid prescribing rate of 1.0%.
How many Nephrology Physician providers are there in the US? ▼
There are 10,534 Nephrology Physician providers across 55 states in the US. The average Nephrology Physician provider writes 1,454 Medicare Part D claims per year.
What drugs does Oliver Guerrero Dujarric, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Oliver Guerrero Dujarric, MD's most frequently prescribed drugs include Sevelamer Carbonate, Lanthanum Carbonate, Doxazosin Mesylate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Oliver Guerrero Dujarric, MD accept Medicare? ▼
Oliver Guerrero Dujarric, MD appears in CMS Medicare data with 1,154 Part D claims and 242 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Oliver Guerrero Dujarric, MD's credentials? ▼
Oliver Guerrero Dujarric, MD's NPI is 1861598039 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.