{"npi":"1285801407","type":"NPI-1","status":"active","name":{"display":"Mrs. Iryna Chastain M.D.","other":[{"code":"5","type":"Also known as","value":"CHASTAIN, IRYNA GENNAGYEVNA"}],"first":"IRYNA","last":"CHASTAIN","middle":"G","credential":"M.D."},"specialty":{"primary_taxonomy":"207R00000X","primary_taxonomy_description":"Internal Medicine","slug":"internal-medicine","schema_org_specialty":"Internal","all":[{"code":"207R00000X","description":"Internal Medicine","primary":true,"state":"MA","license":"238742"}]},"addresses":[{"purpose":"LOCATION","street_1":"123 SUMMER ST","city":"WORCESTER","state":"MA","postal_code":"016081216","country_code":"US","phone":"5083635000"},{"purpose":"MAILING","street_1":"5 NEPONSET STREET","city":"WORCESTER","state":"MA","postal_code":"016062714","country_code":"US","street_2":"WOT 2ND FL, STE C203","phone":"5088520600","fax":"5083683146"}],"license":{"state":"MA","number":"238742"},"identifiers":[{"type_code":"05","label":"Medicaid","value":"110083584A","state":"MA","issuer":null}],"pecos":{"enrolled_at":"2026-05-09T10:41:39.028268+00:00","enrollments":[{"enrlmt_id":"I20090702000539","type_code":"14-11","type_desc":"PRACTITIONER - INTERNAL MEDICINE","state":"MA","pac_id":"7618028606"}]},"enumeration_date":"2008-05-15","last_updated":"2020-03-09","_meta":{"source":"NPPES","snapshot_date":"2020-03-09","doc_url":"https://findmynpi.com/api"}}