NPI registry status
Active
2026 NPPES data Gastroenterology Physician NPI 1588634182 M.D.
Verify on CMS → Alex John, M.D.
Gastroenterology Physician in Colchester, Vermont.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 17,061 in Gastroenterology 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
382
Medicare Part D claims · 162 beneficiaries · Gastroenterology Physician avg: 848
Generic prescribing
72%
generic claims · 28% 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
Alex John, M.D. filed 382 Medicare Part D claims in 2024 as a Gastroenterology Physician in Colchester, Vermont, prescribing 72% generic.
- 382
- Part D claims, 2024
- 72%
- generic prescribing
- ≥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 Alex John, M.D.
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 1588634182), first enumerated 01/25/2006.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 382 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 1588634182 · Gastroenterology Physician
NPI-10 · ENUM-LEGACY · TAX-MID · RX-LIGHT · BOOK-THIN · PHOTO-ENUM
- NPI-10 1588634182
- ENUM-LEGACY 2006
- TAX-MID 17K Gastroenterology Physician
- RX-LIGHT 382
- BOOK-THIN 30 in Vermont
- PHOTO-ENUM Dan Foss · 2006
Alex John, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2024, across all CMS prescribers nationally
382 ≥ 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)
Alex John, M.D. 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 Alex John, M.D.?
Quality data not reportedPrimary specialty
Gastroenterology Physician
Medicare Part D claims
382 55% vs specialty avg
Specialty distribution in Vermont
How Gastroenterology Physician compares to other specialties among Vermont 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 Gastroenterology 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 | 1588634182 |
|---|---|
| Specialty | Gastroenterology Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 01/25/2006 |
Brand vs generic prescribing mix · Above average
Alex John, M.D. - brand share 28.0%
Gastroenterology Physician average
28% brand-name claims vs 72% generic, on 382 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.
382
Total Claims
$530K
Total Drug Cost
162
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 663.667
- Total Day Supply
- 17,601
- Brand vs Generic
- 28% brand / 72% generic
- Brand Drug Cost
- $476K
- Generic Drug Cost
- $54K
Patient Demographics
- Average Patient Age
- 74.8 years
- Avg HCC Risk Score
- 0.93
- Gender Split
- 52% female / 48% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What Alex John, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2024
- Gavilyte-G
Gavilyte-G
48 claims
- Omeprazole
Omeprazole
40 claims
- Mesalamine
Mesalamine
32 claims
- Sod Sulf-Potass Su…
Sod Sulf-Potass Sulf-Mag Sulf
26 claims
- Mesalamine Er
Mesalamine Er
21 claims
- Pantoprazole Sodium
Pantoprazole Sodium
20 claims
- Peg-3350 And Elect…
Peg-3350 And Electrolytes
20 claims
- Humira(Cf) Pen 16
Humira(Cf) Pen
16 claims
| Drug | Claims |
|---|---|
| Gavilyte-G Peg3350/Sod Sulf,bicarb,cl/Kcl | 48 |
| Omeprazole | 40 |
| Mesalamine | 32 |
| Sod Sulf-Potass Sulf-Mag Sulf Sodium, Potassium,mag Sulfates | 26 |
| Mesalamine Er Mesalamine | 21 |
| Pantoprazole Sodium | 20 |
| Peg-3350 And Electrolytes Peg3350/Sod Sulf,bicarb,cl/Kcl | 20 |
| Humira(Cf) Pen Adalimumab | 16 |
| Viberzi Eluxadoline | 14 |
| Colestipol Hcl | 12 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Gastroenterology Physician Overview
How Alex John, M.D. fits within the Gastroenterology Physician landscape nationally.
17,061
Gastroenterology Physician Providers in US
54
States with Gastroenterology Physician
848
Avg Claims per Provider
Alex John, M.D.'s 382 claims are below the specialty average of 848.
Nationwide Gastroenterology Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for John, both outside Vermont 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 Gastroenterology Physician Providers in Vermont
Other clinicians with the same primary specialty enrolled in Vermont, drawn from the same CMS NPPES roster as John.
One of 30 Gastroenterology Physician providers enrolled in Vermont, 5 are shown here.
Dr. Joseph Anderson
M.D.
White River Junction, VT
Dr. Eric Asnis
M.D.
Berlin, VT
Dr. Arthur Colley
M.D.
Middlebury, VT
Dr. Nicholas Ferrentino
M.D.
Burlington, VT
Dr. Eric Ganguly
MD
Burlington, VT
Compare Gastroenterology Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Alex John, M.D.'s specialty? ▼
Alex John, M.D. specializes in Gastroenterology Physician and practices in Colchester, Vermont. Credentials: M.D..
How much does Alex John, M.D. prescribe under Medicare Part D? ▼
In 2024, Alex John, M.D. wrote 382 Medicare Part D claims totaling $530K in drug costs for 162 beneficiaries.
Where is Alex John, M.D. located? ▼
Alex John, M.D. is located at 875 ROOSEVELT HWY, Colchester, VT, 05446. Phone: (802) 864-7483.
What is Alex John, M.D.'s NPI number? ▼
Alex John, M.D.'s National Provider Identifier (NPI) is 1588634182, issued on 01/25/2006.
Does Alex John, M.D. prescribe more brand-name or generic drugs? ▼
Alex John, M.D.'s prescribing is 28% brand-name and 72% generic drugs by claim count, with $476K in brand drug costs.
How many Gastroenterology Physician providers are there in the US? ▼
There are 17,061 Gastroenterology Physician providers across 54 states in the US. The average Gastroenterology Physician provider writes 848 Medicare Part D claims per year.
What drugs does Alex John, M.D. prescribe most often? ▼
Based on 2024 Medicare Part D data, Alex John, M.D.'s most frequently prescribed drugs include Gavilyte-G, Omeprazole, Mesalamine. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Alex John, M.D. accept Medicare? ▼
Alex John, M.D. appears in CMS Medicare data with 382 Part D claims and 162 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Alex John, M.D.'s credentials? ▼
Alex John, M.D.'s NPI is 1588634182 with credentials M.D.. 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.