A18.51 ICD-10-CM Code: Tuberculous episcleritis
A18.51 is not a CMS-HCC payment code. MEAT criteria · RAF Calculator · HCC Buddy coding tools
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FY 2026 Apr update / Certain infectious and parasitic diseases (A00-B99) / Tuberculosis (A15-A19)
A18.51
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceTuberculous episcleritis
This is an infection of the episclera (the tissue layer covering the white part of the eye) caused by tuberculosis bacteria. It represents a rare complication of tuberculosis that affects the eye.
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 A18.51 in this effective period.
Excludes 2
Official- lupus vulgaris of eyelid (A18.4)
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for A18.51 in this effective period.
Excludes 1
OfficialICD-10-CM does not list Excludes 1 notes for A18.51 in this effective period.
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for A18.51 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for A18.51 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for A18.51 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 A18.51 an HCC code?
No. A18.51 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
- A18.51
- Description
- Tuberculous episcleritis
- 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
A18.51 is the ICD-10-CM diagnosis code for tuberculous episcleritis. This is an infection of the episclera (the tissue layer covering the white part of the eye) caused by tuberculosis bacteria. It represents a rare complication of tuberculosis that affects the eye. A18.51 sits in the ICD-10-CM chapter for certain infectious and parasitic diseases (a00-b99), within the section covering tuberculosis (a15-a19).
A18.51 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.
This code requires confirmation of tuberculosis diagnosis - ensure documentation specifies tuberculous etiology rather than other causes of episcleritis.
HCC Buddy maintains structured V28 and V24 mapping, source-labeled coefficient references, and MEAT documentation criteria for A18.51 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •This code requires confirmation of tuberculosis diagnosis - ensure documentation specifies tuberculous etiology rather than other causes of episcleritis
- •This is a manifestation code of extrapulmonary tuberculosis; verify if a primary TB site code (such as A15-A19) should also be reported to capture the complete clinical picture