ICD-10-CM > H00-H59 > H30-H36 > H31 > H31.2 H31.2 Hereditary choroidal dystrophy Non-Billable/Non-Specific Type 2 Excludes hyperornithinemia (E72.4)ornithinemia (E72.4) Codes H31.20Hereditary choroidal dystrophy, unspecifiedH31.21ChoroideremiaH31.22Choroidal dystrophy (central areolar) (generalized) (peripapillary)H31.23Gyrate atrophy, choroidH31.29Other hereditary choroidal dystrophy