NPI registry status
Active
2026 NPPES data Infectious Disease Physician NPI 1013095587 MD
Verify on CMS → Antonio Zarraga, MD
Infectious Disease Physician in Milford, Delaware.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 8,314 in Infectious Disease 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
4K
Medicare Part D claims · 398 beneficiaries · Infectious Disease Physician avg: 816
Generic prescribing
87%
generic claims · 12% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$21.27
1 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
Antonio Zarraga, MD filed 3,885 Medicare Part D claims in 2023 as a Infectious Disease Physician in Milford, Delaware, prescribing 87% generic.
- 4K
- Part D claims, 2023
- 87%
- generic prescribing
- 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.
Antonio Zarraga, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
3,885 Top 9% higher than 91% 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)
Antonio Zarraga, 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 Antonio Zarraga, MD?
Quality data not reportedPrimary specialty
Infectious Disease Physician
Medicare Part D claims
3,885 376% vs specialty avg
Specialty distribution in Delaware
How Infectious Disease Physician compares to other specialties among Delaware 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 Infectious Disease 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).
Antonio Zarraga, MD appears in the CMS NPPES registry as an Infectious Disease Physician provider holding MD credentials at 101 WELLNESS WAY STE 200, Milford, DE, 19963, with a listed phone of (302) 430-0867. NPI 1013095587 was issued on 11/01/2006.
Medicare Part D records for calendar year 2023 show 3,885 prescription claims written by this provider, covering 398 Medicare beneficiaries and totaling roughly $758K in drug spend, split 12% brand-name and 87% generic by claim count, with an opioid prescribing rate of 0.5%.
Infectious Disease Physician is a mid-sized specialty nationwide, with 8,314 enrolled providers across 54 states and an average of 816 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 | 1013095587 |
|---|---|
| Specialty | Infectious Disease Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 11/01/2006 |
Hospital and facility affiliations
Facilities where Antonio Zarraga, 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.
Bayhealth Medical Center, Inc
Milford, DE
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 Antonio Zarraga, MD. Source: openpaymentsdata.cms.gov.
Total received
$21
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 · Typical
Antonio Zarraga, MD - brand share 12.0%
Infectious Disease Physician average
12% brand-name claims vs 87% generic, on 3,885 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.
3,885
Total Claims
$758K
Total Drug Cost
398
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 8,593
- Total Day Supply
- 251,834
- Brand vs Generic
- 12% brand / 87% generic
- Brand Drug Cost
- $659K
- Generic Drug Cost
- $97K
- Opioid Claims
- 18 (0.5% rate)
- Antibiotic Claims
- 92
Patient Demographics
- Average Patient Age
- 74.3 years
- Avg HCC Risk Score
- 1.21
- Gender Split
- 47% female / 53% male
- Age Distribution
- <65: 36, 65-74: 176, 75-84: 137, 85+: 49
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Antonio Zarraga, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Levothyroxine Sodium
Levothyroxine Sodium
212 claims
- Amlodipine Besylate
Amlodipine Besylate
172 claims
- Lisinopril
Lisinopril
155 claims
- Atorvastatin Calcium
Atorvastatin Calcium
146 claims
- Hydrochlorothiazide
Hydrochlorothiazide
124 claims
- Metoprolol Succinate
Metoprolol Succinate
120 claims
- Rosuvastatin Calcium
Rosuvastatin Calcium
117 claims
- Metoprolol Tartrate
Metoprolol Tartrate
107 claims
| Drug | Claims |
|---|---|
| Levothyroxine Sodium | 212 |
| Amlodipine Besylate | 172 |
| Lisinopril | 155 |
| Atorvastatin Calcium | 146 |
| Hydrochlorothiazide | 124 |
| Metoprolol Succinate | 120 |
| Rosuvastatin Calcium | 117 |
| Metoprolol Tartrate | 107 |
| Gabapentin | 102 |
| Losartan Potassium | 101 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Infectious Disease Physician Overview
How Antonio Zarraga, MD fits within the Infectious Disease Physician landscape nationally.
8,314
Infectious Disease Physician Providers in US
54
States with Infectious Disease Physician
816
Avg Claims per Provider
Antonio Zarraga, MD's 3,885 claims are above the specialty average of 816.
Nearby Infectious Disease Physician Providers in Delaware
Other clinicians with the same primary specialty enrolled in Delaware, drawn from the same CMS NPPES roster as Zarraga.
Dr. Alfred Bacon
MD
Newark, DE
Dr. William Chasanov
D.O.
Lewes, DE
Dr. Jimmy Chua
M.D.
Lewes, DE
Dr. David Cohen
M.D.
Newark, DE
Dr. Marci Drees
M.D.
Smyrna, DE
Compare Infectious Disease 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 Delaware medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Infectious Disease 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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How insurance networks affect your costs
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Frequently Asked Questions
What is Antonio Zarraga, MD's specialty? ▼
Antonio Zarraga, MD specializes in Infectious Disease Physician and practices in Milford, Delaware. Credentials: MD.
How much does Antonio Zarraga, MD prescribe under Medicare Part D? ▼
In 2023, Antonio Zarraga, MD wrote 3,885 Medicare Part D claims totaling $758K in drug costs for 398 beneficiaries.
Where is Antonio Zarraga, MD located? ▼
Antonio Zarraga, MD is located at 101 WELLNESS WAY STE 200, Milford, DE, 19963. Phone: (302) 430-0867.
What is Antonio Zarraga, MD's NPI number? ▼
Antonio Zarraga, MD's National Provider Identifier (NPI) is 1013095587, issued on 11/01/2006.
Does Antonio Zarraga, MD prescribe more brand-name or generic drugs? ▼
Antonio Zarraga, MD's prescribing is 12% brand-name and 87% generic drugs by claim count, with $659K in brand drug costs.
Does Antonio Zarraga, MD prescribe opioids? ▼
Yes, Antonio Zarraga, MD had 18 opioid claims in 2023 with an opioid prescribing rate of 0.5%.
How many Infectious Disease Physician providers are there in the US? ▼
There are 8,314 Infectious Disease Physician providers across 54 states in the US. The average Infectious Disease Physician provider writes 816 Medicare Part D claims per year.
What drugs does Antonio Zarraga, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Antonio Zarraga, MD's most frequently prescribed drugs include Levothyroxine Sodium, Amlodipine Besylate, Lisinopril. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Antonio Zarraga, MD accept Medicare? ▼
Antonio Zarraga, MD appears in CMS Medicare data with 3,885 Part D claims and 398 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Antonio Zarraga, MD's credentials? ▼
Antonio Zarraga, MD's NPI is 1013095587 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.