NPI registry status
Active
2026 NPPES data Internal Medicine Physician NPI 1346405628 MD
Verify on CMS → Caroline McWilliams, MD
Internal Medicine Physician in Mays Landing, New Jersey.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 172,737 in Internal Medicine 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
10K
Medicare Part D claims · 163 beneficiaries · Internal Medicine Physician avg: 3K
Generic prescribing
83%
generic claims · 16% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$20.39
1 payments · CMS Open Payments (Sunshine Act)
Source: CMS Medicare Part D Prescriber Public Use File, 2023
What the federal data shows
Caroline McWilliams, MD filed 10,416 Medicare Part D claims in 2023 as an Internal Medicine Physician in Mays Landing, New Jersey, prescribing 83% generic.
- 10K
- Part D claims, 2023
- 83%
- generic prescribing
- $20.39
- industry payments (Sunshine Act)
- ≥98th
- pct by Part D claim volume (lower-bound band)
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.
Caroline McWilliams, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
10,416 ≥ 98th percentile 98% of 1,370,886 prescribers are in lower value bands
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.
The percentile is a conservative 100-claim band: it counts only prescribers in lower claim-volume bands. Medicare Part D claim volume is activity context, not a quality measure or recommendation. See methodology § corpus placement.
Source CMS Medicare Part D Prescriber Public Use File · 2023
◑
Board-eligible specialty (heuristic, not verified)
Caroline McWilliams, MD 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 Caroline McWilliams, MD?
Quality data not reportedPrimary specialty
Internal Medicine Physician
Medicare Part D claims
10,416 284% vs specialty avg
Specialty distribution in New Jersey
How Internal Medicine Physician compares to other specialties among New Jersey 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 Internal Medicine 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).
Caroline McWilliams, MD appears in the CMS NPPES registry as an Internal Medicine Physician provider holding MD credentials at 5034 ATLANTIC AVE, Mays Landing, NJ, 08330, with a listed phone of (609) 782-0005. NPI 1346405628 was issued on 07/25/2008.
Medicare Part D records for calendar year 2023 show 10,416 prescription claims written by this provider, covering 163 Medicare beneficiaries and totaling roughly $1.4 million in drug spend, split 16% brand-name and 83% generic by claim count, with an opioid prescribing rate of 0.3%.
Internal Medicine Physician is a high-volume specialty nationwide, with 172,737 enrolled providers across 56 states and an average of 2,716 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 | 1346405628 |
|---|---|
| Specialty | Internal Medicine Physician |
| Credentials | MD |
| Gender | Female |
| NPI Issued | 07/25/2008 |
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 Caroline McWilliams, MD. Source: openpaymentsdata.cms.gov.
Total received
$20
Largest payer
Biogen, 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.
Brand vs generic prescribing mix · Typical
Caroline McWilliams, MD - brand share 16.0%
Internal Medicine Physician average
16% brand-name claims vs 83% generic, on 10,416 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.
10,416
Total Claims
$1.4M
Total Drug Cost
163
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 10,428
- Total Day Supply
- 232,467
- Brand vs Generic
- 16% brand / 83% generic
- Brand Drug Cost
- $944K
- Generic Drug Cost
- $477K
- Opioid Claims
- 27 (0.3% rate)
- Antibiotic Claims
- 343
Patient Demographics
- Average Patient Age
- 60.2 years
- Avg HCC Risk Score
- 3.29
- Gender Split
- 52% female / 48% male
- Age Distribution
- <65: 100, 65-74: 46, 75-84: N/A, 85+: N/A
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Caroline McWilliams, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Baclofen
Baclofen
885 claims
- Gabapentin
Gabapentin
593 claims
- Levetiracetam 325
Levetiracetam
325 claims
- Tizanidine Hcl 312
Tizanidine Hcl
312 claims
- Atorvastatin Calcium 311
Atorvastatin Calcium
311 claims
- Furosemide 300
Furosemide
300 claims
- Oxybutynin Chlorid… 296
Oxybutynin Chloride Er
296 claims
- Eliquis 288
Eliquis
288 claims
| Drug | Claims |
|---|---|
| Baclofen | 885 |
| Gabapentin | 593 |
| Levetiracetam | 325 |
| Tizanidine Hcl | 312 |
| Atorvastatin Calcium | 311 |
| Furosemide | 300 |
| Oxybutynin Chloride Er Oxybutynin Chloride | 296 |
| Eliquis Apixaban | 288 |
| Escitalopram Oxalate | 212 |
| Duloxetine Hcl | 184 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Internal Medicine Physician Overview
How Caroline McWilliams, MD fits within the Internal Medicine Physician landscape nationally.
172,737
Internal Medicine Physician Providers in US
56
States with Internal Medicine Physician
2,716
Avg Claims per Provider
Caroline McWilliams, MD's 10,416 claims are above the specialty average of 2,716.
Nearby Internal Medicine Physician Providers in New Jersey
Other clinicians with the same primary specialty enrolled in New Jersey, drawn from the same CMS NPPES roster as McWilliams.
Dr. Joseph Aaron
MD, FACP
Short Hills, NJ
Dr. Sirike Aasmaa
DO
Montville, NJ
Dr. Holly Abate Bersalona
M.D.
Sea Girt, NJ
Dr. Kaniz Zehra Abbas
MD
Trenton, NJ
Dr. Shahida Abbas
MD
Old Bridge, NJ
Compare Internal Medicine 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 New Jersey medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Internal Medicine 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
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Understanding Medicare Claims Data
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How insurance networks affect your costs
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Frequently Asked Questions
What is Caroline McWilliams, MD's specialty? ▼
Caroline McWilliams, MD specializes in Internal Medicine Physician and practices in Mays Landing, New Jersey. Credentials: MD.
How much does Caroline McWilliams, MD prescribe under Medicare Part D? ▼
In 2023, Caroline McWilliams, MD wrote 10,416 Medicare Part D claims totaling $1.4M in drug costs for 163 beneficiaries.
Where is Caroline McWilliams, MD located? ▼
Caroline McWilliams, MD is located at 5034 ATLANTIC AVE, Mays Landing, NJ, 08330. Phone: (609) 782-0005.
What is Caroline McWilliams, MD's NPI number? ▼
Caroline McWilliams, MD's National Provider Identifier (NPI) is 1346405628, issued on 07/25/2008.
Does Caroline McWilliams, MD prescribe more brand-name or generic drugs? ▼
Caroline McWilliams, MD's prescribing is 16% brand-name and 83% generic drugs by claim count, with $944K in brand drug costs.
Does Caroline McWilliams, MD prescribe opioids? ▼
Yes, Caroline McWilliams, MD had 27 opioid claims in 2023 with an opioid prescribing rate of 0.3%.
How many Internal Medicine Physician providers are there in the US? ▼
There are 172,737 Internal Medicine Physician providers across 56 states in the US. The average Internal Medicine Physician provider writes 2,716 Medicare Part D claims per year.
What drugs does Caroline McWilliams, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Caroline McWilliams, MD's most frequently prescribed drugs include Baclofen, Gabapentin, Levetiracetam. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Caroline McWilliams, MD accept Medicare? ▼
Caroline McWilliams, MD appears in CMS Medicare data with 10,416 Part D claims and 163 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Caroline McWilliams, MD's credentials? ▼
Caroline McWilliams, MD's NPI is 1346405628 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
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.