{"npi":"1306864822","type":"NPI-1","status":"active","name":{"display":"Dr. John Pfeifer MD","other":[],"first":"JOHN","last":"PFEIFER","middle":"D","credential":"MD"},"specialty":{"primary_taxonomy":"207ZP0007X","primary_taxonomy_description":"Molecular Genetic Pathology (Pathology) Physician","slug":"molecular-genetic-pathology-pathology-physician","schema_org_specialty":null,"all":[{"code":"207ZP0101X","description":"Anatomic Pathology Physician","primary":false,"state":"MO","license":"101865"},{"code":"207ZP0007X","description":"Molecular Genetic Pathology (Pathology) Physician","primary":true,"state":"MO","license":"101865"}]},"addresses":[{"purpose":"LOCATION","street_1":"1 BARNES JEWISH HOSPITAL PLZ","city":"SAINT LOUIS","state":"MO","postal_code":"631101003","country_code":"US","street_2":"DIV PA ANATOMIC AND MOLECULAR PATH","phone":"3143625641","fax":"3143620369"},{"purpose":"MAILING","street_1":"PO BOX 7412011","city":"CHICAGO","state":"IL","postal_code":"606742011","country_code":"US","phone":"3143625641","fax":"3143620369"}],"license":{"state":"MO","number":"101865"},"identifiers":[{"type_code":"05","label":"Medicaid","value":"208282004","state":"MO","issuer":null}],"pecos":{"enrolled_at":"2026-05-09T10:41:39.028268+00:00","enrollments":[{"enrlmt_id":"I20100305000516","type_code":"14-22","type_desc":"PRACTITIONER - PATHOLOGY","state":"MO","pac_id":"8426193129"},{"enrlmt_id":"I20230511002821","type_code":"14-22","type_desc":"PRACTITIONER - PATHOLOGY","state":"IL","pac_id":"8426193129"}]},"enumeration_date":"2006-07-17","last_updated":"2025-04-17","_meta":{"source":"NPPES","snapshot_date":"2025-04-17","doc_url":"https://findmynpi.com/api"}}