A systematic screening of antibodies revealed a diverse antibody repertoire in CIDP patients, including those against NF-155 (4.6%), CNTN1 (6.2%), Caspr1/CNTN1 complex (1.5%), P2 (1.6%), and anti-ganglioside antibodies (18.6%). Here, CNTN1 is linked to chronic inflammatory demyelinating polyradiculoneuropathy.