Question 1

What is ICD-10 code H16.313?

Accepted Answer

H16.313 is the ICD-10-CM diagnosis code for corneal abscess, bilateral. A bacterial infection causing pus collection in the cornea (the clear front part of the eye) affecting both eyes. H16.313 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).

H16.313 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.

Verify documentation specifies bilateral involvement; if only one eye is affected, use H16.311 or H16.312 instead.

Question 2

Is H16.313 an HCC code?

Accepted Answer

No. H16.313 is a billable ICD-10-CM code but does not map to any payment HCC category under the CMS-HCC V28, V24, ESRD, or RxHCC risk adjustment models. It can still be reported on Medicare Advantage encounter data submissions, but it does not contribute to the beneficiary's Risk Adjustment Factor (RAF) score and therefore does not affect the risk-adjusted capitation payment to the plan. V28 reached 100% phase-in for payment year 2026.

Question 3

Is H16.313 billable?

Accepted Answer

Yes. H16.313 is a billable ICD-10-CM code that can be reported on professional and institutional claims as a primary or secondary diagnosis when the provider documentation supports the specific condition described. Billable codes in ICD-10-CM are coded to the highest level of specificity available for the documented diagnosis. H16.313 is current for fiscal year 2026 and remains in the active CMS ICD-10-CM code set published by the National Center for Health Statistics.

Question 4

What is the V28 vs V24 difference for H16.313?

Accepted Answer

H16.313 does not map to a payment HCC under either the CMS-HCC V28 risk adjustment model or the older V24 model. V28 reached 100% phase-in for payment year 2026, replacing V24 which was used during the PY2024–PY2025 transition. Because neither model rewards H16.313 with a risk adjustment factor, it contributes zero to a Medicare Advantage beneficiary's RAF score in either version. Coders should check whether provider documentation supports a more specific child code that does map to a payment HCC.

Question 5

What should coders know when reporting H16.313?

Accepted Answer

Verify documentation specifies bilateral involvement; if only one eye is affected, use H16.311 or H16.312 instead Corneal abscess often requires urgent ophthalmology referral and may be associated with contact lens use or trauma

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H16.313

Is H16.313 an HCC code?

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H16.313 ICD-10-CM Code: Corneal abscess, bilateral

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H16.313

Is H16.313 an HCC code?

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Child Codes

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Open H16.313 in the Interactive Encoder