H18.549 ICD-10-CM Code: Lattice corneal dystrophy, unspecified eye
H18.549 is not a CMS-HCC payment code. MEAT criteria · RAF Calculator · HCC coding software
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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)
H18.549
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceLattice corneal dystrophy, unspecified eye
A hereditary corneal condition where a lattice-like pattern of deposits forms in the cornea, but the affected eye is not specified.
CMS-HCC V28
N/A—
Not mapped
CMS-HCC V24
HistoricalHistorical
Not used for CY2026 payment
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 H18.549 in this effective period.
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for H18.549 in this effective period.
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for H18.549 in this effective period.
Excludes 1
OfficialICD-10-CM does not list Excludes 1 notes for H18.549 in this effective period.
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for H18.549 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for H18.549 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for H18.549 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 H18.549 an HCC code?
No. H18.549 is a billable ICD-10-CM code with no mapping under the CMS-HCC V28 or V24 community payment models, and none under the ESRD, Part D RxHCC, or HHS-HCC models.
- Code
- H18.549
- Description
- Lattice corneal dystrophy, unspecified eye
- HCC (V28)
- No CMS-HCC V28 mapping
- RAF reference coefficient
- —
- 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
H18.549 is the ICD-10-CM diagnosis code for lattice corneal dystrophy, unspecified eye. A hereditary corneal condition where a lattice-like pattern of deposits forms in the cornea, but the affected eye is not specified. H18.549 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).
H18.549 is a billable ICD-10-CM code, but the current payload does not show a mapping under the CMS-HCC V28 or V24 community payment models, and none under the ESRD, Part D RxHCC, or HHS-HCC models. Do not assign risk adjustment value from this page when no source-backed mapping is shown; verify the applicable model and payment year.
Use this code only when laterality cannot be determined from documentation.
HCC Buddy maintains structured V28 and V24 mapping, source-labeled coefficient references, and MEAT documentation criteria for H18.549 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Use this code only when laterality cannot be determined from documentation
- •Query the provider if possible to determine which eye is affected for more specific coding