NPI registry status
Active
2026 NPPES data Infectious Disease Physician NPI 1255423737 MD
Verify on CMS → Ryan Westergaard, MD
Infectious Disease Physician in Madison, Wisconsin.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 8,292 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
595
Medicare Part D claims · 230 beneficiaries · Infectious Disease Physician avg: 816
Generic prescribing
0%
generic claims · 69% 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
Ryan Westergaard, MD filed 595 Medicare Part D claims in 2023 as a Infectious Disease Physician in Madison, Wisconsin, prescribing 0% generic.
- 595
- Part D claims, 2023
- 0%
- 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.
Ryan Westergaard, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
595 Top 34% higher than 66% 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)
Ryan Westergaard, 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 Ryan Westergaard, MD?
Quality data not reportedPrimary specialty
Infectious Disease Physician
Medicare Part D claims
595 27% vs specialty avg
Specialty distribution in Wisconsin
How Infectious Disease Physician compares to other specialties among Wisconsin 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).
Ryan Westergaard, MD appears in the CMS NPPES registry as a Infectious Disease Physician provider holding MD credentials at 600 HIGHLAND AVE, Madison, WI, 53792, with a listed phone of (608) 263-0946. NPI 1255423737 was issued on 09/29/2006.
Medicare Part D records for calendar year 2023 show 595 prescription claims written by this provider, covering 230 Medicare beneficiaries and totaling roughly $596K in drug spend, split 69% brand-name and 0% generic by claim count.
Infectious Disease Physician is a mid-sized specialty nationwide, with 8,292 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 | 1255423737 |
|---|---|
| Specialty | Infectious Disease Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 09/29/2006 |
Hospital and facility affiliations
Facilities where Ryan Westergaard, 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.
University OF Wisconsin Medical Foundation Inc
Madison, WI
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
Brand vs generic prescribing mix · Brand-heavy
Ryan Westergaard, MD - brand share 69.0%
Infectious Disease Physician average
69% brand-name claims vs 0% generic, on 595 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.
595
Total Claims
$596K
Total Drug Cost
230
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 693
- Total Day Supply
- 13,461
- Brand vs Generic
- 69% brand / 0% generic
- Brand Drug Cost
- $529K
Patient Demographics
- Average Patient Age
- 72.3 years
- Avg HCC Risk Score
- 1.07
- Gender Split
- 55% female / 45% male
- Age Distribution
- <65: 21, 65-74: 129, 75-84: 68, 85+: 12
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Ryan Westergaard, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Shingrix
Shingrix
168 claims
- Isentress 32
Isentress
32 claims
- Juluca 25
Juluca
25 claims
- Descovy 23
Descovy
23 claims
- Prezcobix 23
Prezcobix
23 claims
- Biktarvy 20
Biktarvy
20 claims
- Maraviroc 20
Maraviroc
20 claims
- Genvoya 17
Genvoya
17 claims
| Drug | Claims |
|---|---|
| Shingrix Varicella-Zoster Ge/As01b/Pf | 168 |
| Isentress Raltegravir Potassium | 32 |
| Juluca Dolutegravir/Rilpivirine | 25 |
| Descovy Emtricitabine/Tenofov Alafenam | 23 |
| Prezcobix Darunavir/Cobicistat | 23 |
| Biktarvy Bictegrav/Emtricit/Tenofov Ala | 20 |
| Maraviroc | 20 |
| Genvoya Elviteg/Cob/Emtri/Tenof Alafen | 17 |
| Abacavir-Lamivudine Abacavir Sulfate/Lamivudine | 13 |
| Acyclovir | 13 |
* 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 Ryan Westergaard, MD fits within the Infectious Disease Physician landscape nationally.
8,292
Infectious Disease Physician Providers in US
54
States with Infectious Disease Physician
816
Avg Claims per Provider
Ryan Westergaard, MD's 595 claims are below the specialty average of 816.
Nearby Infectious Disease Physician Providers in Wisconsin
Other clinicians with the same primary specialty enrolled in Wisconsin, drawn from the same CMS NPPES roster as Westergaard.
Dr. Adetunji Adejumo
MD
Green Bay, WI
Dr. William Agger
MD
La Crosse, WI
Dr. Francisco Aguilar
M.D.
Milwaukee, WI
Dr. Syed Ala
MD
Waupaca, WI
Dr. Sol Del Mar Aldrete Audiffred
M.D.
Milwaukee, WI
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 Wisconsin 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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Frequently Asked Questions
What is Ryan Westergaard, MD's specialty? ▼
Ryan Westergaard, MD specializes in Infectious Disease Physician and practices in Madison, Wisconsin. Credentials: MD.
How much does Ryan Westergaard, MD prescribe under Medicare Part D? ▼
In 2023, Ryan Westergaard, MD wrote 595 Medicare Part D claims totaling $596K in drug costs for 230 beneficiaries.
Where is Ryan Westergaard, MD located? ▼
Ryan Westergaard, MD is located at 600 HIGHLAND AVE, Madison, WI, 53792. Phone: (608) 263-0946.
What is Ryan Westergaard, MD's NPI number? ▼
Ryan Westergaard, MD's National Provider Identifier (NPI) is 1255423737, issued on 09/29/2006.
Does Ryan Westergaard, MD prescribe more brand-name or generic drugs? ▼
Ryan Westergaard, MD's prescribing is 69% brand-name and 0% generic drugs by claim count, with $529K in brand drug costs.
How many Infectious Disease Physician providers are there in the US? ▼
There are 8,292 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 Ryan Westergaard, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Ryan Westergaard, MD's most frequently prescribed drugs include Shingrix, Isentress, Juluca. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Ryan Westergaard, MD accept Medicare? ▼
Ryan Westergaard, MD appears in CMS Medicare data with 595 Part D claims and 230 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Ryan Westergaard, MD's credentials? ▼
Ryan Westergaard, MD's NPI is 1255423737 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.