2006 ICD-9-CM Volume 1 Diagnosis Codes Home > Diseases Of The Nervous System And Sense Organs 320-389 > Disorders Of The Eye And Adnexa 360-379 > Visual Disturbances 368.* > 2006 ICD-9-CM Diagnosis 368.5 Color vision deficiencies View the most recent version of ICD-9-CM 368.5 Defects of color vision are mainly hereditary traits but can be secondary to acquired or developmental abnormalities in the CONES (RETINA). Severity of hereditary defects of color vision depends on the degree of mutation of the OPSIN genes (on X CHROMOSOME and CHROMOSOME 3, HUMAN) that code the photopigments for red, green and blue. 368.5 is a non-specific code that cannot be used to specify a diagnosis View the ICD-9-CM Volume 1 368.* hierarchy Alternate Terminology Color blindness