NPI registry status
Active
2026 NPPES data Gastroenterology Physician NPI 1386624716 M.D.
Verify on CMS → Waldo Santiago Montalvo, M.D.
Gastroenterology Physician in Aguadilla, 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 16,567 in Gastroenterology 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 · 527 beneficiaries · Gastroenterology Physician avg: 833
Generic prescribing
96%
generic claims · 4% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$89.4
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
Waldo Santiago Montalvo, M.D. filed 1,550 Medicare Part D claims in 2023 as a Gastroenterology Physician in Aguadilla, Puerto Rico, prescribing 96% generic.
- 2K
- Part D claims, 2023
- 96%
- generic prescribing
- $89.4
- 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.
Waldo Santiago Montalvo, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
1,550 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
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Board-eligible specialty (heuristic, not verified)
Waldo Santiago Montalvo, 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 Waldo Santiago Montalvo, M.D.?
Quality data not reportedPrimary specialty
Gastroenterology Physician
Medicare Part D claims
1,550 86% vs specialty avg
Specialty distribution in Puerto Rico
How Gastroenterology 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 Gastroenterology 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).
Waldo Santiago Montalvo, M.D. appears in the CMS NPPES registry as a Gastroenterology Physician provider holding M.D. credentials at 23 CALLE SEVERIANO CUEVAS, Aguadilla, PR, 00603, with a listed phone of (787) 882-2929. NPI 1386624716 was issued on 01/20/2006.
Medicare Part D records for calendar year 2023 show 1,550 prescription claims written by this provider, covering 527 Medicare beneficiaries and totaling roughly $258K in drug spend, split 4% brand-name and 96% generic by claim count.
Gastroenterology Physician is a mid-sized specialty nationwide, with 16,567 enrolled providers across 54 states and an average of 833 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 | 1386624716 |
|---|---|
| Specialty | Gastroenterology Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 01/20/2006 |
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 Waldo Santiago Montalvo, M.D.. Source: openpaymentsdata.cms.gov.
Total received
$89
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 · Generic-heavy
Waldo Santiago Montalvo, M.D. - brand share 4.0%
Gastroenterology Physician average
4% brand-name claims vs 96% generic, on 1,550 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.
1,550
Total Claims
$258K
Total Drug Cost
527
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 1,564
- Total Day Supply
- 42,077
- Brand vs Generic
- 4% brand / 96% generic
- Brand Drug Cost
- $237K
- Generic Drug Cost
- $20K
- Antibiotic Claims
- 130
Patient Demographics
- Average Patient Age
- 70.8 years
- Avg HCC Risk Score
- 2.21
- Gender Split
- 63% female / 37% male
- Age Distribution
- <65: 104, 65-74: 233, 75-84: 158, 85+: 32
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Waldo Santiago Montalvo, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Famotidine
Famotidine
576 claims
- Omeprazole
Omeprazole
274 claims
- Pantoprazole Sodium 225
Pantoprazole Sodium
225 claims
- Lansoprazole 81
Lansoprazole
81 claims
- Metronidazole 71
Metronidazole
71 claims
- Ciprofloxacin Hcl 36
Ciprofloxacin Hcl
36 claims
- Procto-Med Hc 36
Procto-Med Hc
36 claims
- Cholestyramine Light 23
Cholestyramine Light
23 claims
| Drug | Claims |
|---|---|
| Famotidine | 576 |
| Omeprazole | 274 |
| Pantoprazole Sodium | 225 |
| Lansoprazole | 81 |
| Metronidazole | 71 |
| Ciprofloxacin Hcl | 36 |
| Procto-Med Hc Hydrocortisone | 36 |
| Cholestyramine Light Cholestyramine/Aspartame | 23 |
| Hydrocortisone | 21 |
| Metoclopramide Hcl | 20 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Gastroenterology Physician Overview
How Waldo Santiago Montalvo, M.D. fits within the Gastroenterology Physician landscape nationally.
16,567
Gastroenterology Physician Providers in US
54
States with Gastroenterology Physician
833
Avg Claims per Provider
Waldo Santiago Montalvo, M.D.'s 1,550 claims are above the specialty average of 833.
Nearby Gastroenterology Physician Providers in Puerto Rico
Other clinicians with the same primary specialty enrolled in Puerto Rico, drawn from the same CMS NPPES roster as Santiago Montalvo.
Dr. Yamilka Abreu Delgado
MD
Humacao, PR
Dr. Melvyn Acosta
M.D.
Hato Rey, PR
Dr. Mamie Annexy Lopez
MD
Manati, PR
Dr. Ivan Antunez Gonzalez
M.D.
Guaynabo, PR
Dr. Nestor Aponte-Reyes
MD
Manati, PR
Compare Gastroenterology 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 Gastroenterology 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
Who treats what and how specialties differ
Understanding Medicare Claims Data
What prescribing data reveals about a provider
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How insurance networks affect your costs
Telehealth Guide
Virtual care options and coverage in 2026
Explore Puerto Rico
Frequently Asked Questions
What is Waldo Santiago Montalvo, M.D.'s specialty? ▼
Waldo Santiago Montalvo, M.D. specializes in Gastroenterology Physician and practices in Aguadilla, Puerto Rico. Credentials: M.D..
How much does Waldo Santiago Montalvo, M.D. prescribe under Medicare Part D? ▼
In 2023, Waldo Santiago Montalvo, M.D. wrote 1,550 Medicare Part D claims totaling $258K in drug costs for 527 beneficiaries.
Where is Waldo Santiago Montalvo, M.D. located? ▼
Waldo Santiago Montalvo, M.D. is located at 23 CALLE SEVERIANO CUEVAS, Aguadilla, PR, 00603. Phone: (787) 882-2929.
What is Waldo Santiago Montalvo, M.D.'s NPI number? ▼
Waldo Santiago Montalvo, M.D.'s National Provider Identifier (NPI) is 1386624716, issued on 01/20/2006.
Does Waldo Santiago Montalvo, M.D. prescribe more brand-name or generic drugs? ▼
Waldo Santiago Montalvo, M.D.'s prescribing is 4% brand-name and 96% generic drugs by claim count, with $237K in brand drug costs.
How many Gastroenterology Physician providers are there in the US? ▼
There are 16,567 Gastroenterology Physician providers across 54 states in the US. The average Gastroenterology Physician provider writes 833 Medicare Part D claims per year.
What drugs does Waldo Santiago Montalvo, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Waldo Santiago Montalvo, M.D.'s most frequently prescribed drugs include Famotidine, Omeprazole, Pantoprazole Sodium. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Waldo Santiago Montalvo, M.D. accept Medicare? ▼
Waldo Santiago Montalvo, M.D. appears in CMS Medicare data with 1,550 Part D claims and 527 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Waldo Santiago Montalvo, M.D.'s credentials? ▼
Waldo Santiago Montalvo, M.D.'s NPI is 1386624716 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.