H18.599 ICD-10-CM Code: Other hereditary corneal dystrophies, unspecified eye

H18.599 is the ICD-10-CM diagnosis code for other hereditary corneal dystrophies, unspecified eye. A group of inherited eye conditions affecting the cornea (the clear front part of the eye) that cause progressive vision problems, but the specific type is not identified. H18.599 sits in the ICD-10-CM chapter for diseases of the eye and adnexa (h00-h59), within the section covering disorders of sclera, cornea, iris and ciliary body (h15-h22).

H18.599 is a billable ICD-10-CM code but does not map to a payment HCC under the CMS-HCC V28, V24, ESRD, or RxHCC risk adjustment models. It can be reported on Medicare Advantage encounter data submissions but it does not contribute to a beneficiary's RAF score and therefore does not affect risk-adjusted payments to the plan.

Use this code only when the specific type of hereditary corneal dystrophy cannot be determined from documentation.