In simple words: This code refers to an inherited eye condition that affects the choroid, which is a part of the eye that supplies blood to the retina. It is used when the doctor doesn't specify the exact type of this inherited condition.

A genetically transmitted disorder affecting the choroid, the vascular layer of the eye, located between the retina and the sclera.This unspecified code indicates that the specific type of hereditary choroidal dystrophy is not documented or known.

Example 1: A 35-year-old patient presents with progressive vision loss and night blindness.Family history reveals similar symptoms in older relatives. Upon examination, the ophthalmologist finds characteristic changes in the choroid, consistent with a hereditary dystrophy, but the specific type is not yet determined. H31.20 is used until further testing can identify the specific subtype., A young child undergoes a routine eye exam, and the ophthalmologist notices early signs of choroidal thinning.Genetic testing is ordered to determine if a specific hereditary choroidal dystrophy is present.While awaiting the results, H31.20 is used as a preliminary diagnosis., A patient with known hereditary choroidal dystrophy presents for follow-up care. The specific subtype was previously undetermined and no new information has come to light so H31.20 is used.

Documentation should include a detailed family history of eye conditions, results of ophthalmological examinations (including visual acuity tests, fundus photography, and potentially imaging studies like optical coherence tomography), and possibly genetic testing reports.

** Excludes2: hyperornithinemia (E72.4) ornithinemia (E72.4).