BEGIN:VCARD VERSION:3.0 FN:John Hagen\, MD N:Hagen;John;;;MD TITLE:Student in an Organized Health Care Education/Training Program TEL;TYPE=WORK,VOICE:+17137986362 URL:https://www.gale.care/providers/tx/houston/john-hagen-md-1821747700 NOTE:NPI 1821747700. From the NPPES registry (CMS)\, file of 2026-06-08. No t affiliated with Gale. X-NPI:1821747700 END:VCARD