Posted Date
Effective Date
Update Type Test Code Change
CPT Code 86698 x3
Order Code CHISM
Referral Laboratory Mayo Medical Laboratories

Histoplasma Antibody, CSF

Order Code:                  CHISM

Fee Code:                    AA538 (CPT 86698 x3)

Reference Laboratory:   Mayo CHIST


New Order Code:          HICSF

New Reference Lab:      Mayo HICSF


Effective June 4, 2024, Mayo Clinic Laboratories will replace the Histoplasma Antibody, CSF, assay (Mayo test ID CHIST) with Histoplasma Antibody, Complement Fixation and Immunodiffusion, CSF (Mayo test ID HICSF). The Histoplasma mycelial antigen by complement fixation component will be removed due to limited clinical utility.