H16.322 ICD-10-CM Code: Diffuse interstitial keratitis, left eye
HCC Buddy Code Card
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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)
H16.322
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceDiffuse interstitial keratitis, left eye
A chronic inflammatory condition of the cornea affecting the left eye, often causing scarring and vision problems.
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
Official- Cogan's syndrome
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for H16.322 in this effective period.
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for H16.322 in this effective period.
Excludes 1
OfficialICD-10-CM does not list Excludes 1 notes for H16.322 in this effective period.
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for H16.322 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for H16.322 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for H16.322 in this effective period.
Buddy Documentation Tip
Last updated: FY2026 ICD-10-CM Apr update, Apr 1, 2026 through Sep 30, 2026. CMS-HCC V28 is 100% phased in for payment year 2026.
Is H16.322 an HCC code?
No. H16.322 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.
- Code
- H16.322
- Description
- Diffuse interstitial keratitis, left eye
- 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
H16.322 is the ICD-10-CM diagnosis code for diffuse interstitial keratitis, left eye. A chronic inflammatory condition of the cornea affecting the left eye, often causing scarring and vision problems. H16.322 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).
H16.322 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.
Diffuse interstitial keratitis is frequently associated with syphilis or other systemic infections; review patient history for underlying cause.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for H16.322 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Diffuse interstitial keratitis is frequently associated with syphilis or other systemic infections; review patient history for underlying cause
- •This condition typically develops slowly and may require long-term treatment; document any associated systemic disease