NPI registry status
Active
2026 NPPES data Allergy Physician NPI 1013941012 MD
Verify on CMS → William Chernack, MD
Allergy Physician in Morristown, 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 1,015 in Allergy 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
101
Medicare Part D claims · 30 beneficiaries · Allergy Physician avg: 805
Generic prescribing
83%
generic claims · 17% brand-name · higher generic rates reduce patient out-of-pocket costs
Source: CMS Medicare Part D Prescriber Public Use File, 2024
What the federal data shows
William Chernack, MD filed 101 Medicare Part D claims in 2024 as an Allergy Physician in Morristown, New Jersey, prescribing 83% generic.
- 101
- Part D claims, 2024
- 83%
- generic prescribing
- ≥34th
- 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 Chernack, 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 1013941012), first enumerated 07/10/2006.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 101 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.
- 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 1013941012 · Allergy Physician
NPI-10 · ENUM-LEGACY · TAX-NARROW · RX-LIGHT · BOOK-THIN · PHOTO-ENUM
- NPI-10 1013941012
- ENUM-LEGACY 2006
- TAX-NARROW 1,015
- RX-LIGHT 101
- BOOK-THIN 46 in New Jersey
- PHOTO-ENUM Lois Endo, M.D. · 2006
William Chernack, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2024, across all CMS prescribers nationally
101 ≥ 34th percentile 34% 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 Chernack, 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 Chernack, MD?
Quality data not reportedPrimary specialty
Allergy Physician
Medicare Part D claims
101 87% vs specialty avg
Specialty distribution in New Jersey
How Allergy 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 Allergy 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 | 1013941012 |
|---|---|
| Specialty | Allergy Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 07/10/2006 |
Brand vs generic prescribing mix · Typical
William Chernack, MD - brand share 17.0%
Allergy Physician average
17% brand-name claims vs 83% generic, on 101 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.
101
Total Claims
$10K
Total Drug Cost
30
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 224.967
- Total Day Supply
- 6,513
- Brand vs Generic
- 17% brand / 83% generic
- Brand Drug Cost
- $7K
- Generic Drug Cost
- $3K
Patient Demographics
- Average Patient Age
- 77.2 years
- Avg HCC Risk Score
- 0.97
- Age Distribution
- <65: 0, 65-74: N/A, 75-84: 21, 85+: N/A
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
| Drug | Claims |
|---|---|
| Montelukast Sodium | 26 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Allergy Physician Overview
How William Chernack, MD fits within the Allergy Physician landscape nationally.
1,015
Allergy Physician Providers in US
50
States with Allergy Physician
805
Avg Claims per Provider
William Chernack, MD's 101 claims are below the specialty average of 805.
Nationwide Allergy Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Chernack, 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 Allergy Physician Providers in New Jersey
Other clinicians with the same primary specialty enrolled in New Jersey, drawn from the same CMS NPPES roster as Chernack.
One of 46 Allergy Physician providers enrolled in New Jersey, 5 are shown here.
Dr. Eric Applebaum
M.D.
Parsippany, NJ
Dr. Sandra Applebaum
M.D.
Parsippany, NJ
Dr. Thu Aung
M.D.
Brick, NJ
Dr. Eric Bantz
M.D.
Medford, NJ
Dr. Kenneth Better
M.D.
Linwood, NJ
Compare Allergy Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is William Chernack, MD's specialty? ▼
William Chernack, MD specializes in Allergy Physician and practices in Morristown, New Jersey. Credentials: MD.
How much does William Chernack, MD prescribe under Medicare Part D? ▼
In 2024, William Chernack, MD wrote 101 Medicare Part D claims totaling $10K in drug costs for 30 beneficiaries.
Where is William Chernack, MD located? ▼
William Chernack, MD is located at 28 FRANKLIN PL, Morristown, NJ, 07960. Phone: (973) 538-7271.
What is William Chernack, MD's NPI number? ▼
William Chernack, MD's National Provider Identifier (NPI) is 1013941012, issued on 07/10/2006.
Does William Chernack, MD prescribe more brand-name or generic drugs? ▼
William Chernack, MD's prescribing is 17% brand-name and 83% generic drugs by claim count, with $7K in brand drug costs.
How many Allergy Physician providers are there in the US? ▼
There are 1,015 Allergy Physician providers across 50 states in the US. The average Allergy Physician provider writes 805 Medicare Part D claims per year.
What drugs does William Chernack, MD prescribe most often? ▼
Based on 2024 Medicare Part D data, William Chernack, MD's most frequently prescribed drugs include Montelukast Sodium. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does William Chernack, MD accept Medicare? ▼
William Chernack, MD appears in CMS Medicare data with 101 Part D claims and 30 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify William Chernack, MD's credentials? ▼
William Chernack, MD's NPI is 1013941012 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.