Jessica Allegretti, MD
Enriched profileMedical Director, Crohn's and Colitis Center, Brigham and Women's Hospital; Associate Professor of Medicine, Harvard Medical School · Brigham and Women's Hospital
Jessica Allegretti is Medical Director, Crohn's and Colitis Center, Brigham and Women's Hospital; Associate Professor of Medicine, Harvard Medical School at Brigham and Women's Hospital. ClinicalTrials.gov lists 8 registered studies with this person as an investigator.
Data verified 14 Aug 2026
Overview
Updated 14 Oct 2026
Jessica R. Allegretti, MD, is Medical Director, Crohn's and Colitis Center, Brigham and Women's Hospital. The public record shows 318 publications with 7,522 citations (h-index 44), centered on IBD (Crohn's / UC). It also documents an investigator role on 8 registered clinical trials, industry payments reported by 22 companies, 4 NIH-funded awards (2018–2026).
- Top research focus: IBD (Crohn's / UC)
- 8 registered trials on ClinicalTrials.gov
- Open Payments reporting from 22 companies
Generated from the cited public record · current as of 14 Oct 2026. Every fact links its source below.
Indications focus
from trials led + research topicsResearch focus
OpenAlex concept fingerprintDrugs & molecules
across trials, industry payments and publicationsWorks with
trial sponsors and companies reporting paymentsScholarship
indexed output and impact (OpenAlex)Hirsch index, productivity × impact (OpenAlex).
Clinical & industry
trials, payments and federal fundingPublic positions
sourced statements on record- provisionalFound in a cited public source but not yet independently corroborated. Published as a labeled candidate and queued for verification.How we verify →ajmc.com ↗
Contact
The practice address and phone this provider lists in the federal NPPES (CMS) registry.
Practice address
Telephone
Practice address and telephone from the federal NPPES registry.
Sign in to view contact details →Clinical trials
Updated 14 Oct 2026
Listed as an investigator on 8 registered studies on ClinicalTrials.gov. The most recent:
- Zymfentra (Infliximab-dyyb) REal World Cohort STudy
Sponsor: University of North Carolina, Chapel Hill
- Pilot Trial of Xylitol for C. Difficile De-Colonization in Patients With Inflammatory Bowel Disease
Sponsor: Brigham and Women's Hospital
- Use of Fidaxomicin Compared to Vancomycin for Decolonization of C. Difficile in Patients With Inflammatory Bowel Disease
Sponsor: Brigham and Women's Hospital
Industry payments
Updated 14 Oct 2026
22 companies reported payments to CMS in program years 2021–2025. These are public disclosures, not judgments. The latest:
- ABBVIE INC.Program year202541 payments$83,362openpaymentsdata.cms.gov ↗
- Janssen Biotech, Inc.Program year202544 payments$70,360openpaymentsdata.cms.gov ↗
- PFIZER INC.Program year20258 payments$22,348openpaymentsdata.cms.gov ↗
Medicare prescribing footprint (2024)
The drugs this prescriber writes for Medicare patients, grouped by drug class and therapeutic area. Every percentage is a share of their total prescribing, so you can see what they prescribe most. These are proportions, not patient counts or dollar amounts. No condition is inferred: the claims record what was prescribed, never why.
Metabolism & gastrointestinal
45%Antidiarrheal10%Diphenoxylate-Atropine100%Part D<11 patientsProton pump inhibitor10%Pantoprazole Sodium100%Part D<11 patients+ 4 more classes in this area
Cancer & immunology
21.8%Interleukin-12 Antagonist17%Stelara100%Part D<11 patientsInterleukin-23 Antagonist4.8%Skyrizi On-Body100%Part D<11 patientsAnti-infectives
19.7%Glycopeptide Antibacterial19.7%Vancomycin Hcl100%Part D≥11 patients
Drug classes come from the WHO ATC and U.S. National Library of Medicine (RxClass) classifications; prescribing counts come from the CMS Medicare Part D Prescribers file. Each drug is counted once, under its primary class. Medicare fee-for-service only, so no Medicare Advantage, commercial, or pediatric prescribing is included. CMS publishes this data about 17 months after the fact.
NIH funding
Updated 14 Oct 2026
4 NIH research awards on record, funded 2018–2026 per NIH RePORTER. The latest:
- Research Training in Gastrointestinal and Hepatic Diseases
Brigham and Women'S Hospital
FY2026$302,556T32DK135449 - Research Training in Gastrointestinal and Hepatic Diseases
Brigham and Women'S Hospital
FY2025$372,956T32DK135449 - Research Training in Gastrointestinal and Hepatic Diseases
Brigham and Women'S Hospital
FY2025$100,769T32DK135449
Publications
Matched to this physician's OpenAlex author record; most-cited works shown first.
- International consensus statement on microbiome testing in clinical practice
The Lancet. Gastroenterology & hepatology
2024
Online presence
Updated 14 Oct 2026
This person's own public accounts first, then places where others mention them. Two different things, listed separately.
Owned accounts
public accounts run by this person- Doximity
doximity.com/pub/jessica-allegretti-md
verifiedCorroborated by findmyKOL. We matched this record across two or more independent public sources (or a verified ORCID / NPI identifier bridge) before attributing it to this person.How we verify →doximity.com ↗ - Other
allegrettilab.com/meet-dr-allegretti-1
verifiedCorroborated by findmyKOL. We matched this record across two or more independent public sources (or a verified ORCID / NPI identifier bridge) before attributing it to this person.How we verify →allegrettilab.com ↗ - ResearchGate
researchgate.net/profile/Jessica-Allegretti
verifiedCorroborated by findmyKOL. We matched this record across two or more independent public sources (or a verified ORCID / NPI identifier bridge) before attributing it to this person.How we verify →researchgate.net ↗ - ResearchGate
researchgate.net/profile/Jessica-Allegretti-3
verifiedCorroborated by findmyKOL. We matched this record across two or more independent public sources (or a verified ORCID / NPI identifier bridge) before attributing it to this person.How we verify →researchgate.net ↗ - X / Twitter
x.com/DrAllegrettiIBD
- X / Twitter
x.com/DrJessicaA
Mentions by others
where others cite or feature them- Other
gi.org/2021/01/06/conversations-with-women-in-gi-jessica-a-allegretti-md-mph-facg
- Other
microbiome.mit.edu/microbiome_news/an-interview-with-dr-jessica-r-allegretti-md-mph
verifiedCorroborated by findmyKOL. We matched this record across two or more independent public sources (or a verified ORCID / NPI identifier bridge) before attributing it to this person.How we verify →microbiome.mit.edu ↗ - Other
physiciandirectory.brighamandwomens.org/details/12662/jessica-allegretti-gastroenterology_hepatology_and_endoscopy-internal_medicine-boston
verifiedCorroborated by findmyKOL. We matched this record across two or more independent public sources (or a verified ORCID / NPI identifier bridge) before attributing it to this person.How we verify →physiciandirectory.brighamandwomens.org ↗ - Other
theguthealthpodcast.buzzsprout.com/2293918/episodes/15503107-diarrhea-from-c-diff-to-ibs-d-with-dr-jessica-allegretti
verifiedCorroborated by findmyKOL. We matched this record across two or more independent public sources (or a verified ORCID / NPI identifier bridge) before attributing it to this person.How we verify →theguthealthpodcast.buzzsprout.com ↗ - YouTube
m.youtube.com/watch
verifiedCorroborated by findmyKOL. We matched this record across two or more independent public sources (or a verified ORCID / NPI identifier bridge) before attributing it to this person.How we verify →m.youtube.com ↗ - X / Twitter
X (Twitter) profile: @DrJessicaA
provisionalFound in a cited public source but not yet independently corroborated. Published as a labeled candidate and queued for verification.How we verify →x.com ↗
We list an account only when the public record ties it to this person. verified means we've confirmed the match in more than one place; provisional means it looks right but we're still confirming.
Background & recognition
Updated 14 Oct 2026
Credentials, appointments and honors, newest first, each linked to the public source it came from.
Education
degrees and training on record- verifiedCorroborated by findmyKOL. We matched this record across two or more independent public sources (or a verified ORCID / NPI identifier bridge) before attributing it to this person.How we verify →doctors.massgeneralbrigham.org ↗
- verifiedCorroborated by findmyKOL. We matched this record across two or more independent public sources (or a verified ORCID / NPI identifier bridge) before attributing it to this person.How we verify →physiciandirectory.brighamandwomens.org ↗
- MPH
Harvard T.H. Chan School of Public Health (Clinical Effectiveness, clinical trials focus)
verifiedCorroborated by findmyKOL. We matched this record across two or more independent public sources (or a verified ORCID / NPI identifier bridge) before attributing it to this person.How we verify →allegrettilab.com ↗
Editorial & leadership roles
journal and society appointments- Founder and Director
Fecal Microbiota Transplantation Program, Brigham and Women's Hospital
verifiedCorroborated by findmyKOL. We matched this record across two or more independent public sources (or a verified ORCID / NPI identifier bridge) before attributing it to this person.How we verify →allegrettilab.com ↗ - Clinical Development Lead
Massachusetts-Host Microbiome Center
provisionalFound in a cited public source but not yet independently corroborated. Published as a labeled candidate and queued for verification.How we verify →allegrettilab.com ↗
Awards & honors
honors on the public record- provisionalFound in a cited public source but not yet independently corroborated. Published as a labeled candidate and queued for verification.How we verify →physiciandirectory.brighamandwomens.org ↗
- provisionalFound in a cited public source but not yet independently corroborated. Published as a labeled candidate and queued for verification.How we verify →physiciandirectory.brighamandwomens.org ↗
- verifiedCorroborated by findmyKOL. We matched this record across two or more independent public sources (or a verified ORCID / NPI identifier bridge) before attributing it to this person.How we verify →shermanprize.org ↗
- verifiedCorroborated by findmyKOL. We matched this record across two or more independent public sources (or a verified ORCID / NPI identifier bridge) before attributing it to this person.How we verify →physiciandirectory.brighamandwomens.org ↗
- IBD Rising Star Award / Rising Healthcare Leader in IBD
Crohn's and Colitis Foundation New England Chapter
2015verifiedCorroborated by findmyKOL. We matched this record across two or more independent public sources (or a verified ORCID / NPI identifier bridge) before attributing it to this person.How we verify →physiciandirectory.brighamandwomens.org ↗
Secondary affiliations
appointments beyond the home institution- Scientific Advisory Board / featured expert
OpenBiome (national stool bank)
provisionalFound in a cited public source but not yet independently corroborated. Published as a labeled candidate and queued for verification.How we verify →openbiome.org ↗ - Associate Editor
Inflammatory Bowel Diseases Journal (Oxford Academic)
provisionalFound in a cited public source but not yet independently corroborated. Published as a labeled candidate and queued for verification.How we verify →allegrettilab.com ↗ - Associate Editor
American Journal of Gastroenterology
provisionalFound in a cited public source but not yet independently corroborated. Published as a labeled candidate and queued for verification.How we verify →allegrettilab.com ↗
Media & interviews
press, podcasts and appearances- The Gut Health Podcast
"Diarrhea: from C.Diff to IBS-D (with guest Jessica Allegretti, MD)"
verifiedCorroborated by findmyKOL. We matched this record across two or more independent public sources (or a verified ORCID / NPI identifier bridge) before attributing it to this person.How we verify →theguthealthpodcast.buzzsprout.com ↗ - IBD Drive Time podcast
episode with Jessica Allegretti, MD, on C diff and IBD
verifiedCorroborated by findmyKOL. We matched this record across two or more independent public sources (or a verified ORCID / NPI identifier bridge) before attributing it to this person.How we verify →hmpgloballearningnetwork.com ↗ - Consultant360
transcript interview, "Jessica Allegretti, MD, on FMT for the Treatment of C difficile"
verifiedCorroborated by findmyKOL. We matched this record across two or more independent public sources (or a verified ORCID / NPI identifier bridge) before attributing it to this person.How we verify →consultant360.com ↗ - American College of Gastroenterology blog
"Conversations with Women in GI: Jessica A. Allegretti, MD, MPH, FACG"
- MIT Center for Microbiome Informatics & Therapeutics
"An Interview with Dr. Jessica R. Allegretti, MD, MPH"
verifiedCorroborated by findmyKOL. We matched this record across two or more independent public sources (or a verified ORCID / NPI identifier bridge) before attributing it to this person.How we verify →microbiome.mit.edu ↗ - provisionalFound in a cited public source but not yet independently corroborated. Published as a labeled candidate and queued for verification.How we verify →allegrettilab.com ↗
Every item links to where we found it. verified means we've confirmed it in more than one place; provisional means we found it and are still confirming.
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