NPI registry status
Active
2026 NPPES data Internal Medicine Physician NPI 1538364237 D. O.
Verify on CMS → John Fedullo, D. O.
Internal Medicine Physician in Amsterdam, New York.
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
4K
Medicare Part D claims · 447 beneficiaries · Internal Medicine Physician avg: 3K
Generic prescribing
83%
generic claims · 16% brand-name · higher generic rates reduce patient out-of-pocket costs
Source: CMS Medicare Part D Prescriber Public Use File, 2023
What the federal data shows
John Fedullo, D. O. filed 4,327 Medicare Part D claims in 2023 as an Internal Medicine Physician in Amsterdam, New York, prescribing 83% generic.
- 4K
- Part D claims, 2023
- 83%
- 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.
John Fedullo, D. O.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
4,327 Top 8% higher than 92% 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)
John Fedullo, D. O. practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 2 hospital affiliations - 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 John Fedullo, D. O.?
Quality data not reportedPrimary specialty
Internal Medicine Physician
Medicare Part D claims
4,327 59% vs specialty avg
Specialty distribution in New York
How Internal Medicine Physician compares to other specialties among New York 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).
John Fedullo, D. O. appears in the CMS NPPES registry as an Internal Medicine Physician provider holding D. O. credentials at 4988 STATE HIGHWAY 30, Amsterdam, NY, 12010, with a listed phone of (518) 841-3481. NPI 1538364237 was issued on 06/20/2007.
Medicare Part D records for calendar year 2023 show 4,327 prescription claims written by this provider, covering 447 Medicare beneficiaries and totaling roughly $323K in drug spend, split 16% brand-name and 83% generic by claim count, with an opioid prescribing rate of 2.5%.
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 | 1538364237 |
|---|---|
| Specialty | Internal Medicine Physician |
| Credentials | D. O. |
| Gender | Male |
| NPI Issued | 06/20/2007 |
Hospital and facility affiliations
Facilities where John Fedullo, D. O. 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.
Nysarc Inc Fulton County Chapter
Johnstown, NY
St. Mary's Healthcare
Amsterdam, NY
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
License & disciplinary context - New York NYSBPMC 2023 annual report
Aggregate state board data only, NOT a determination of any individual provider's status. The figures below describe statewide disciplinary activity across all ~100K New York medical licensees in 2023 - they are NOT specific to John Fedullo, D. O.. To verify John Fedullo, D. O.'s current license status, search the NYSBPMC public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
312
Total board actions, New York 2023
Across 302 cases
3.12
Actions per 1,000 licensees
New York statewide rate
probation
Most common action type
89 cases
NYSBPMC publishes annual disciplinary statistics as part of public-record reporting under each state's Administrative Procedure Act. See the full breakdown by action type and year on the New York disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Brand vs generic prescribing mix · Typical
John Fedullo, D. O. - brand share 16.0%
Internal Medicine Physician average
16% brand-name claims vs 83% generic, on 4,327 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.
4,327
Total Claims
$323K
Total Drug Cost
447
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 4,833
- Total Day Supply
- 120,353
- Brand vs Generic
- 16% brand / 83% generic
- Brand Drug Cost
- $210K
- Generic Drug Cost
- $109K
- Opioid Claims
- 110 (2.5% rate)
- Antibiotic Claims
- 163
Patient Demographics
- Average Patient Age
- 73.8 years
- Avg HCC Risk Score
- 1.75
- Gender Split
- 70% female / 30% male
- Age Distribution
- <65: 92, 65-74: 134, 75-84: 110, 85+: 111
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What John Fedullo, D. O. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Atorvastatin Calcium
Atorvastatin Calcium
220 claims
- Eliquis
Eliquis
184 claims
- Omeprazole
Omeprazole
171 claims
- Buprenorphine-Nalo…
Buprenorphine-Naloxone
141 claims
- Levothyroxine Sodium
Levothyroxine Sodium
135 claims
- Amlodipine Besylate
Amlodipine Besylate
116 claims
- Metoprolol Succinate
Metoprolol Succinate
103 claims
- Gabapentin
Gabapentin
98 claims
| Drug | Claims |
|---|---|
| Atorvastatin Calcium | 220 |
| Eliquis Apixaban | 184 |
| Omeprazole | 171 |
| Buprenorphine-Naloxone Buprenorphine Hcl/Naloxone Hcl | 141 |
| Levothyroxine Sodium | 135 |
| Amlodipine Besylate | 116 |
| Metoprolol Succinate | 103 |
| Gabapentin | 98 |
| Metoprolol Tartrate | 82 |
| Lisinopril | 74 |
* 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 John Fedullo, D. O. 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
John Fedullo, D. O.'s 4,327 claims are above the specialty average of 2,716.
Nearby Internal Medicine Physician Providers in New York
Other clinicians with the same primary specialty enrolled in New York, drawn from the same CMS NPPES roster as Fedullo.
Dr. Deborah Aanonsen
D.O.
Staten Island, NY
Dr. Nivedita Aanur
M.D.
New York, NY
Dr. Jay Aaron
MD
Great Neck, NY
Dr. Justin Aaron
MD
New York, NY
Ahmad Abadi
Poughkeepsie, NY
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 York 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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Frequently Asked Questions
What is John Fedullo, D. O.'s specialty? ▼
John Fedullo, D. O. specializes in Internal Medicine Physician and practices in Amsterdam, New York. Credentials: D. O..
How much does John Fedullo, D. O. prescribe under Medicare Part D? ▼
In 2023, John Fedullo, D. O. wrote 4,327 Medicare Part D claims totaling $323K in drug costs for 447 beneficiaries.
Where is John Fedullo, D. O. located? ▼
John Fedullo, D. O. is located at 4988 STATE HIGHWAY 30, Amsterdam, NY, 12010. Phone: (518) 841-3481.
What is John Fedullo, D. O.'s NPI number? ▼
John Fedullo, D. O.'s National Provider Identifier (NPI) is 1538364237, issued on 06/20/2007.
Does John Fedullo, D. O. prescribe more brand-name or generic drugs? ▼
John Fedullo, D. O.'s prescribing is 16% brand-name and 83% generic drugs by claim count, with $210K in brand drug costs.
Does John Fedullo, D. O. prescribe opioids? ▼
Yes, John Fedullo, D. O. had 110 opioid claims in 2023 with an opioid prescribing rate of 2.5%.
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 John Fedullo, D. O. prescribe most often? ▼
Based on 2023 Medicare Part D data, John Fedullo, D. O.'s most frequently prescribed drugs include Atorvastatin Calcium, Eliquis, Omeprazole. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does John Fedullo, D. O. accept Medicare? ▼
John Fedullo, D. O. appears in CMS Medicare data with 4,327 Part D claims and 447 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify John Fedullo, D. O.'s credentials? ▼
John Fedullo, D. O.'s NPI is 1538364237 with credentials D. O.. 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.