NPI registry status
Active
2026 NPPES data Infectious Disease Physician NPI 1114997012 MD
Verify on CMS → William Farrer, MD
Infectious Disease Physician in Elizabeth, 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 8,537 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
399
Medicare Part D claims · 28 beneficiaries · Infectious Disease Physician avg: 807
Generic prescribing
42%
generic claims · 58% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$31.67
2 payments · CMS Open Payments (Sunshine Act)
Source: CMS Medicare Part D Prescriber Public Use File, 2024
What the federal data shows
William Farrer, MD filed 399 Medicare Part D claims in 2024 as an Infectious Disease Physician in Elizabeth, New Jersey, prescribing 42% generic.
- 399
- Part D claims, 2024
- 42%
- generic prescribing
- $31.67
- industry payments (Sunshine Act)
- ≥56th
- 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.
Federal trust snapshot
What official records show about William Farrer, MD
Federal records show an active NPI with Medicare Part D prescribing activity — verifiable registry data, not a proprietary rating.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1114997012), first enumerated 01/24/2006.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 399 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- Reported
Board certification signal
Practices in an ABMS-board-eligible specialty; board certification not confirmed in federal records.
- Reported
Industry payment transparency
$31.67 in reported industry payments (2 transfers) in 2024 under the federal Sunshine Act — disclosed transfers of value, not a quality rating.
Source: CMS Open Payments
- Not in federal data
Individual sanction lookup
PlainDoctor does not publish per-provider disciplinary determinations. Confirm current license and any individual actions through the state medical board or FSMB verification service.
Source: State medical board / FSMB
This trust snapshot summarizes only what appears in federal CMS/NPPES public records. It is not a composite score, star rating, patient review, or clinical recommendation. PlainDoctor never fabricates reviews or AggregateRating schema.
CMS NPPES provider registry desk
NPI 1114997012 · Infectious Disease Physician
NPI-10 · ENUM-LEGACY · TAX-MID · RX-LIGHT · BOOK-THIN · PHOTO-ENUM
- NPI-10 1114997012
- ENUM-LEGACY 2006
- TAX-MID 9K Infectious Disease
- RX-LIGHT 399
- BOOK-THIN 309 in New Jersey
- PHOTO-ENUM Carolyn Denney · 2006
William Farrer, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2024, across all CMS prescribers nationally
399 ≥ 56th percentile 56% of 1,416,883 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 · 2024
◑
Board-eligible specialty (heuristic, not verified)
William Farrer, 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 William Farrer, MD?
Quality data not reportedPrimary specialty
Infectious Disease Physician
Medicare Part D claims
399 51% vs specialty avg
Specialty distribution in New Jersey
How Infectious Disease 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 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).
Practice Address
Provider Details
| NPI | 1114997012 |
|---|---|
| Specialty | Infectious Disease Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 01/24/2006 |
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 William Farrer, MD. Source: openpaymentsdata.cms.gov.
Total received
$32
Largest payer
Gilead Sciences, 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 · Brand-heavy
William Farrer, MD - brand share 58.0%
Infectious Disease Physician average
58% brand-name claims vs 42% generic, on 399 2024 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 2024.
399
Total Claims
$843K
Total Drug Cost
28
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 465
- Total Day Supply
- 13,750
- Brand vs Generic
- 58% brand / 42% generic
- Brand Drug Cost
- $816K
- Generic Drug Cost
- $28K
Patient Demographics
- Average Patient Age
- 69.2 years
- Avg HCC Risk Score
- 1.85
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What William Farrer, MD prescribes most
Top Medicare Part D drugs by claim count, 2024
- Symtuza
Symtuza
60 claims
- Tivicay
Tivicay
39 claims
- Biktarvy
Biktarvy
32 claims
- Rosuvastatin Calcium
Rosuvastatin Calcium
31 claims
- Prezcobix
Prezcobix
24 claims
- Efavirenz-Emtric-T… 21
Efavirenz-Emtric-Tenofov Disop
21 claims
- Evotaz 18
Evotaz
18 claims
- Lamivudine 18
Lamivudine
18 claims
| Drug | Claims |
|---|---|
| Symtuza Darunavir/Cob/Emtri/Tenof Alaf | 60 |
| Tivicay Dolutegravir Sodium | 39 |
| Biktarvy Bictegrav/Emtricit/Tenofov Ala | 32 |
| Rosuvastatin Calcium | 31 |
| Prezcobix Darunavir/Cobicistat | 24 |
| Efavirenz-Emtric-Tenofov Disop Efavirenz/Emtricit/Tenofovr Df | 21 |
| Evotaz Atazanavir Sulfate/Cobicistat | 18 |
| Lamivudine | 18 |
| Descovy Emtricitabine/Tenofov Alafenam | 15 |
| Abacavir Abacavir Sulfate | 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 William Farrer, MD fits within the Infectious Disease Physician landscape nationally.
8,537
Infectious Disease Physician Providers in US
54
States with Infectious Disease Physician
807
Avg Claims per Provider
William Farrer, MD's 399 claims are below the specialty average of 807.
Nationwide Infectious Disease Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Farrer, both outside New Jersey so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2006)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Infectious Disease Physician Providers in New Jersey
Other clinicians with the same primary specialty enrolled in New Jersey, drawn from the same CMS NPPES roster as Farrer.
One of 309 Infectious Disease Physician providers enrolled in New Jersey, 5 are shown here.
Foad Abandeh
MBBS
Mount Laurel, NJ
Dr. Rania Aboujaoude
M.D.
Browns Mills, NJ
Dr. Amany Abu Hanoud
M.D
Newark, NJ
Dr. Alexander Ackley
M.D.
Princeton, NJ
Dr. Ariff Admani
M.D.
Belleville, NJ
Compare Infectious Disease Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is William Farrer, MD's specialty? ▼
William Farrer, MD specializes in Infectious Disease Physician and practices in Elizabeth, New Jersey. Credentials: MD.
How much does William Farrer, MD prescribe under Medicare Part D? ▼
In 2024, William Farrer, MD wrote 399 Medicare Part D claims totaling $843K in drug costs for 28 beneficiaries.
Where is William Farrer, MD located? ▼
William Farrer, MD is located at 240 WILLIAMSON ST STE 401, Elizabeth, NJ, 07202. Phone: (908) 282-0500.
What is William Farrer, MD's NPI number? ▼
William Farrer, MD's National Provider Identifier (NPI) is 1114997012, issued on 01/24/2006.
Does William Farrer, MD prescribe more brand-name or generic drugs? ▼
William Farrer, MD's prescribing is 58% brand-name and 42% generic drugs by claim count, with $816K in brand drug costs.
How many Infectious Disease Physician providers are there in the US? ▼
There are 8,537 Infectious Disease Physician providers across 54 states in the US. The average Infectious Disease Physician provider writes 807 Medicare Part D claims per year.
What drugs does William Farrer, MD prescribe most often? ▼
Based on 2024 Medicare Part D data, William Farrer, MD's most frequently prescribed drugs include Symtuza, Tivicay, Biktarvy. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does William Farrer, MD accept Medicare? ▼
William Farrer, MD appears in CMS Medicare data with 399 Part D claims and 28 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify William Farrer, MD's credentials? ▼
William Farrer, MD's NPI is 1114997012 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 (2024). 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 August 2026 (NPPES) / 2024 (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 August 2026.