{"schema_version":"1","generated_at":"2026-11-04T14:51:47.644Z","data_as_of":null,"url":"https://www.findmykol.com/kol/mark-mattar","json_url":"https://www.findmykol.com/kol/mark-mattar/profile.json","record_kind":"basic","profile_kind":"clinical","person":{"slug":"mark-mattar","name":"Mark Mattar","credential":"MD","specialty":"Gastroenterology","specialty_raw":"Gastroenterology","therapeutic_area":"Gastroenterology","therapeutic_areas":["Gastroenterology"],"institution":"MedStar Georgetown University Hospital","institution_url":"https://www.findmykol.com/institution/medstar-georgetown-university-hospital","city":"Washington","state":"DC","region":{"label":"Northeast","url":"https://www.findmykol.com/region/northeast"}},"identifiers":{"npi":"1841401031","orcid":"0000-0002-9339-1607","openalex":"A5043009808"},"summary":"Mark Mattar is a Gastroenterology physician affiliated with MedStar Georgetown University Hospital. OpenAlex indexes 139 publications with 1,111 citations (h-index 14).","overview":null,"focus":{"indications":[],"research_topics":["Gastroenterology"]},"scholarship":{"works_count":139,"cited_by_count":1111,"h_index":14,"source":"works"},"payments":{"company_count":52,"program_years":{"first":2021,"last":null},"rows_total":30,"shown":3,"withheld":27,"rows":[{"payer":"Janssen","program_year":2025,"amount_usd":37111.86,"payment_count":13,"source_url":"https://openpaymentsdata.cms.gov/search?query=1841401031"},{"payer":"Janssen","program_year":2025,"amount_usd":17953,"payment_count":11,"source_url":"https://openpaymentsdata.cms.gov/search?query=1841401031"},{"payer":"AbbVie","program_year":2025,"amount_usd":17600,"payment_count":6,"source_url":"https://openpaymentsdata.cms.gov/search?query=1841401031"}],"record_url":"https://openpaymentsdata.cms.gov/search?query=1841401031","source":"payments"},"similar":[{"name":"James Lewis","slug":"james-lewis","institution":"MedStar Georgetown University Hospital","specialty":"Gastroenterology","url":"https://www.findmykol.com/kol/james-lewis","json_url":"https://www.findmykol.com/kol/james-lewis/profile.json"},{"name":"Udeme Ekong","slug":"udeme-ekong","institution":"MedStar Georgetown University Hospital","specialty":"Pediatric Transplant Hepatology","url":"https://www.findmykol.com/kol/udeme-ekong","json_url":"https://www.findmykol.com/kol/udeme-ekong/profile.json"},{"name":"Fernando Pagan","slug":"fernando-pagan","institution":"MedStar Georgetown University Hospital","specialty":"Neurology","url":"https://www.findmykol.com/kol/fernando-pagan","json_url":"https://www.findmykol.com/kol/fernando-pagan/profile.json"},{"name":"Stanley Benjamin","slug":"stanley-benjamin","institution":"MedStar Georgetown University Hospital","specialty":"Gastroenterology","url":"https://www.findmykol.com/kol/stanley-benjamin","json_url":"https://www.findmykol.com/kol/stanley-benjamin/profile.json"},{"name":"Charles Rice","slug":"charles-rice","institution":"The Rockefeller University","specialty":"Gastroenterology","url":"https://www.findmykol.com/kol/charles-rice","json_url":"https://www.findmykol.com/kol/charles-rice/profile.json"},{"name":"Edward Loftus","slug":"edward-loftus","institution":"Mayo Clinic Rochester","specialty":"Gastroenterology","url":"https://www.findmykol.com/kol/edward-loftus","json_url":"https://www.findmykol.com/kol/edward-loftus/profile.json"},{"name":"Kris Kowdley","slug":"kris-kowdley","institution":"Washington State University","specialty":"Gastroenterology","url":"https://www.findmykol.com/kol/kris-kowdley","json_url":"https://www.findmykol.com/kol/kris-kowdley/profile.json"},{"name":"Bruce Sands","slug":"bruce-sands","institution":"Icahn School of Medicine at Mount Sinai","specialty":"Gastroenterology","url":"https://www.findmykol.com/kol/bruce-sands","json_url":"https://www.findmykol.com/kol/bruce-sands/profile.json"}],"coverage":{"note":"A basic directory record. Sections absent here were not yet checked for this person, so absence means not yet looked, never none found.","not_yet_checked":["funding","congress","network","presence","recognition"]},"not_included":{"note":"This document is the public layer: neutral facts cited to their source. Judgments (influence tier, archetype, trajectory commentary) and the itemized rows past each section's public teaser are account features and are not served here or to crawlers.","withheld_rows":{"payments":27}},"sources":{"orcid":{"name":"ORCID","url":"https://orcid.org","provides":"The verified researcher identity that anchors authorship"},"identity":{"name":"NPPES (CMS)","url":"https://npiregistry.cms.hhs.gov","provides":"Identity, specialty and practice location for every U.S. clinician"},"works":{"name":"OpenAlex","url":"https://openalex.org","provides":"Citations, h-index, research topics, most-cited works and congress abstracts"},"payments":{"name":"CMS Open Payments","url":"https://openpaymentsdata.cms.gov","provides":"Industry payments reported to CMS, by company and program year","disclaimer":"Payments are publicly reported to CMS. Their existence does not imply wrongdoing; CMS does not interpret these data.","coverage":"Program years 2021 onward"}},"methodology_url":"https://www.findmykol.com/about#methodology"}