{"npi":"1003057779","type":"NPI-1","status":"active","name":{"display":"Dr. Mark Sieminski MD","other":[],"first":"MARK","last":"SIEMINSKI","credential":"MD"},"specialty":{"primary_taxonomy":"207P00000X","primary_taxonomy_description":"Emergency Medicine","slug":"emergency-medicine","schema_org_specialty":"Emergency","all":[{"code":"207P00000X","description":"Emergency Medicine","primary":true,"state":"IL","license":"125051569"}]},"addresses":[{"purpose":"LOCATION","street_1":"305 CAYUGA RD","city":"CHEEKTOWAGA","state":"NY","postal_code":"142251980","country_code":"US","street_2":"SUITE 190","phone":"7165801813"},{"purpose":"MAILING","street_1":"305 CAYUGA RD","city":"CHEEKTOWAGA","state":"NY","postal_code":"142251980","country_code":"US","street_2":"SUITE 190","phone":"7165801813"}],"license":{"state":"IL","number":"125051569"},"identifiers":[],"pecos":{"enrolled_at":"2026-05-09T10:41:39.028268+00:00","enrollments":[{"enrlmt_id":"I20090630000395","type_code":"14-93","type_desc":"PRACTITIONER - EMERGENCY MEDICINE","state":"NY","pac_id":"5496806523"}]},"enumeration_date":"2009-03-10","last_updated":"2009-10-20","_meta":{"source":"NPPES","snapshot_date":"2009-10-20","doc_url":"https://findmynpi.com/api"}}