{"npi":"1639333263","type":"NPI-1","status":"active","name":{"display":"Dr. Matthew Siegel MD","other":[],"first":"MATTHEW","last":"SIEGEL","middle":"BERNARD","credential":"MD"},"specialty":{"primary_taxonomy":"207RH0003X","primary_taxonomy_description":"Hematology & Oncology","slug":"hematology-oncology","schema_org_specialty":"Oncologic","all":[{"code":"207R00000X","description":"Internal Medicine","primary":false,"state":"IL","license":"125054173"},{"code":"207RH0003X","description":"Hematology & Oncology","primary":true,"state":"OR","license":"PG158554"}]},"addresses":[{"purpose":"LOCATION","street_1":"120 SPALDING DR STE 111","city":"NAPERVILLE","state":"IL","postal_code":"605406766","country_code":"US","phone":"6305273788"},{"purpose":"MAILING","street_1":"120 SPALDING DR STE 111","city":"NAPERVILLE","state":"IL","postal_code":"605406766","country_code":"US","phone":"6305273788"}],"license":{"state":"OR","number":"PG158554"},"identifiers":[],"pecos":{"enrolled_at":"2026-05-09T10:41:39.028268+00:00","enrollments":[{"enrlmt_id":"I20150820011506","type_code":"14-83","type_desc":"PRACTITIONER - HEMATOLOGY/ONCOLOGY","state":"IL","pac_id":"5890949176"}]},"enumeration_date":"2008-07-14","last_updated":"2021-03-12","_meta":{"source":"NPPES","snapshot_date":"2021-03-12","doc_url":"https://findmynpi.com/api"}}