H10.409 ICD-10-CM Code: Unspecified chronic conjunctivitis, unspecified eye
H10.409 is not a CMS-HCC payment code. MEAT criteria · RAF Calculator · HCC Buddy coding tools
HCC Buddy Code Card
Digital ICD-10 code-book layout with official code detail, always-visible risk models, Code Trumping, and Buddy coding guidance.
FY 2026 Apr update / Diseases of the eye and adnexa (H00-H59) / Disorders of conjunctiva (H10-H11)
H10.409
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceUnspecified chronic conjunctivitis, unspecified eye
Long-term inflammation of the clear membrane covering the white part of the eye with unknown cause, but the specific eye affected is not documented.
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 H10.409 in this effective period.
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for H10.409 in this effective period.
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for H10.409 in this effective period.
Excludes 1
OfficialICD-10-CM does not list Excludes 1 notes for H10.409 in this effective period.
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for H10.409 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for H10.409 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for H10.409 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 H10.409 an HCC code?
No. H10.409 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
- H10.409
- Description
- Unspecified chronic conjunctivitis, unspecified eye
- HCC (V28)
- No CMS-HCC V28 mapping
- RAF reference coefficient
- —
- Billable
- Yes
- Payment year
- 2026
Coder workflow notes
Get the V28 mapping + MEAT cheat sheet
One printable reference: check representative V28 mappings and the documentation reminders your note needs. Free, no card.
Free PDF. No card. Unsubscribe anytime.
This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).
What This Code Means
H10.409 is the ICD-10-CM diagnosis code for unspecified chronic conjunctivitis, unspecified eye. Long-term inflammation of the clear membrane covering the white part of the eye with unknown cause, but the specific eye affected is not documented. H10.409 sits in the ICD-10-CM chapter for diseases of the eye and adnexa (h00-h59), within the section covering disorders of conjunctiva (h10-h11).
H10.409 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 only when laterality cannot be determined from documentation; this is a less specific code.
HCC Buddy maintains structured V28 and V24 mapping, source-labeled coefficient references, and MEAT documentation criteria for H10.409 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Use only when laterality cannot be determined from documentation; this is a less specific code
- •Query provider to determine unilateral vs. bilateral involvement for more accurate coding