H18.593 ICD-10-CM Code: Other hereditary corneal dystrophies, bilateral
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FY 2026 Apr update / Diseases of the eye and adnexa (H00-H59) / Disorders of sclera, cornea, iris and ciliary body (H15-H22)
H18.593
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceOther hereditary corneal dystrophies, bilateral
A hereditary corneal condition affecting both eyes that does not fit into the standard categories of epithelial, granular, lattice, or macular dystrophies.
CMS-HCC V28
N/A—
Not mapped
CMS-HCC V24
N/A—
Not mapped
ACA/HHS
N/A—
Not mapped
ESRD/PACE
N/A—
Not mapped
RXHCC
N/A—
Not mapped
Code Book Path
Inclusion Terms
OfficialICD-10-CM does not list inclusion terms for H18.593 in this effective period.
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for H18.593 in this effective period.
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for H18.593 in this effective period.
Excludes 1
OfficialICD-10-CM does not list Excludes 1 notes for H18.593 in this effective period.
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for H18.593 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for H18.593 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for H18.593 in this effective period.
Buddy Documentation Tip
Current with CMS: FY2026 ICD-10-CM Apr 1 update (effective Apr 1 – Sep 30, 2026) · CMS-HCC V28, 100% phased in for payment year 2026. FY2027 code set already staged for October 1, 2026. How HCC Buddy stays current →
Is H18.593 an HCC code?
No. H18.593 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.
- Code
- H18.593
- Description
- Other hereditary corneal dystrophies, bilateral
- HCC (V28)
- No CMS-HCC V28 mapping
- RAF
- —
- Billable
- Yes
- Payment year
- 2026
Coder workflow notes
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This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).
What This Code Means
H18.593 is the ICD-10-CM diagnosis code for other hereditary corneal dystrophies, bilateral. A hereditary corneal condition affecting both eyes that does not fit into the standard categories of epithelial, granular, lattice, or macular dystrophies. H18.593 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).
H18.593 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 after confirming the dystrophy does not match more specific categories and affects both eyes.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for H18.593 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Use this code only after confirming the dystrophy does not match more specific categories and affects both eyes
- •Document the specific type of hereditary corneal dystrophy and bilateral involvement in the medical record