ICD-10-CM > H00-H59 > H30-H36 > H31 > H31.1 > H31.12 H31.12 Diffuse secondary atrophy of choroid Non-Billable/Non-Specific Codes H31.121Diffuse secondary atrophy of choroid, right eyeH31.122Diffuse secondary atrophy of choroid, left eyeH31.123Diffuse secondary atrophy of choroid, bilateralH31.129Diffuse secondary atrophy of choroid, unspecified eye