NPI registry status
Active
2026 NPPES data Allergy & Immunology Physician NPI 1841284650 M.D.
Verify on CMS → Ann Zilliox, M.D.
Allergy & Immunology Physician in Newport News, Virginia.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 3,394 in Allergy & Immunology 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
374
Medicare Part D claims · 66 beneficiaries · Allergy & Immunology Physician avg: 764
Generic prescribing
51%
generic claims · 49% brand-name · higher generic rates reduce patient out-of-pocket costs
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
Ann Zilliox, M.D. filed 374 Medicare Part D claims in 2023 as a Allergy & Immunology Physician in Newport News, Virginia, prescribing 51% generic.
- 374
- Part D claims, 2023
- 51%
- generic prescribing
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.
Ann Zilliox, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
374 Top 43% higher than 57% 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)
Ann Zilliox, 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 Ann Zilliox, M.D.?
Quality data not reportedPrimary specialty
Allergy & Immunology Physician
Medicare Part D claims
374 51% vs specialty avg
Specialty distribution in Virginia
How Allergy & Immunology Physician compares to other specialties among Virginia 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 Allergy & Immunology 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).
Ann Zilliox, M.D. appears in the CMS NPPES registry as an Allergy & Immunology Physician provider holding M.D. credentials at 11835 FISHING POINT DR, Newport News, VA, 23606, with a listed phone of (757) 873-3882. NPI 1841284650 was issued on 09/07/2005.
Medicare Part D records for calendar year 2023 show 374 prescription claims written by this provider, covering 66 Medicare beneficiaries and totaling roughly $160K in drug spend, split 49% brand-name and 51% generic by claim count.
Allergy & Immunology Physician is a narrow specialty nationwide, with 3,394 enrolled providers across 52 states and an average of 764 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 | 1841284650 |
|---|---|
| Specialty | Allergy & Immunology Physician |
| Credentials | M.D. |
| Gender | Female |
| NPI Issued | 09/07/2005 |
Brand vs generic prescribing mix · Above average
Ann Zilliox, M.D. - brand share 49.0%
Allergy & Immunology Physician average
49% brand-name claims vs 51% generic, on 374 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.
374
Total Claims
$160K
Total Drug Cost
66
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 561
- Total Day Supply
- 15,858
- Brand vs Generic
- 49% brand / 51% generic
- Brand Drug Cost
- $149K
- Generic Drug Cost
- $11K
Patient Demographics
- Average Patient Age
- 70.5 years
- Avg HCC Risk Score
- 0.87
- Gender Split
- 70% female / 30% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Ann Zilliox, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Breo Ellipta
Breo Ellipta
48 claims
- Albuterol Sulfate …
Albuterol Sulfate Hfa
41 claims
- Montelukast Sodium
Montelukast Sodium
38 claims
- Ipratropium Bromide
Ipratropium Bromide
31 claims
- Azelastine Hcl
Azelastine Hcl
26 claims
- Symbicort
Symbicort
20 claims
- Hydroxyzine Hcl 18
Hydroxyzine Hcl
18 claims
- Fluticasone Propio… 17
Fluticasone Propionate
17 claims
| Drug | Claims |
|---|---|
| Breo Ellipta Fluticasone/Vilanterol | 48 |
| Albuterol Sulfate Hfa Albuterol Sulfate | 41 |
| Montelukast Sodium | 38 |
| Ipratropium Bromide | 31 |
| Azelastine Hcl | 26 |
| Symbicort Budesonide/Formoterol Fumarate | 20 |
| Hydroxyzine Hcl | 18 |
| Fluticasone Propionate | 17 |
| Spiriva Respimat Tiotropium Bromide | 13 |
| Trelegy Ellipta Fluticasone/Umeclidin/Vilanter | 13 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Allergy & Immunology Physician Overview
How Ann Zilliox, M.D. fits within the Allergy & Immunology Physician landscape nationally.
3,394
Allergy & Immunology Physician Providers in US
52
States with Allergy & Immunology Physician
764
Avg Claims per Provider
Ann Zilliox, M.D.'s 374 claims are below the specialty average of 764.
Nearby Allergy & Immunology Physician Providers in Virginia
Other clinicians with the same primary specialty enrolled in Virginia, drawn from the same CMS NPPES roster as Zilliox.
Dr. Parasmani Acharya
M.D.
Pulaski, VA
Veronica Alix
Hampton, VA
Dr. Darshana Alle
M.D.
Henrico, VA
Dr. Oral Alpan
MD
Springfield, VA
Dr. Donald Asbury
MD
Bluefield, VA
Compare Allergy & Immunology 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 Virginia medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Allergy & Immunology 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 Ann Zilliox, M.D.'s specialty? ▼
Ann Zilliox, M.D. specializes in Allergy & Immunology Physician and practices in Newport News, Virginia. Credentials: M.D..
How much does Ann Zilliox, M.D. prescribe under Medicare Part D? ▼
In 2023, Ann Zilliox, M.D. wrote 374 Medicare Part D claims totaling $160K in drug costs for 66 beneficiaries.
Where is Ann Zilliox, M.D. located? ▼
Ann Zilliox, M.D. is located at 11835 FISHING POINT DR, Newport News, VA, 23606. Phone: (757) 873-3882.
What is Ann Zilliox, M.D.'s NPI number? ▼
Ann Zilliox, M.D.'s National Provider Identifier (NPI) is 1841284650, issued on 09/07/2005.
Does Ann Zilliox, M.D. prescribe more brand-name or generic drugs? ▼
Ann Zilliox, M.D.'s prescribing is 49% brand-name and 51% generic drugs by claim count, with $149K in brand drug costs.
How many Allergy & Immunology Physician providers are there in the US? ▼
There are 3,394 Allergy & Immunology Physician providers across 52 states in the US. The average Allergy & Immunology Physician provider writes 764 Medicare Part D claims per year.
What drugs does Ann Zilliox, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Ann Zilliox, M.D.'s most frequently prescribed drugs include Breo Ellipta, Albuterol Sulfate Hfa, Montelukast Sodium. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Ann Zilliox, M.D. accept Medicare? ▼
Ann Zilliox, M.D. appears in CMS Medicare data with 374 Part D claims and 66 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Ann Zilliox, M.D.'s credentials? ▼
Ann Zilliox, M.D.'s NPI is 1841284650 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.
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.