H05.129 ICD-10-CM Code: Orbital myositis, unspecified orbit
HCC Buddy Code Card
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FY 2026 Apr update / Diseases of the eye and adnexa (H00-H59) / Disorders of eyelid, lacrimal system and orbit (H00-H05)
H05.129
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceOrbital myositis, unspecified orbit
Inflammation of the eye socket muscles when the affected eye is not specified.
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
OfficialICD-10-CM does not list inclusion terms for H05.129 in this effective period.
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for H05.129 in this effective period.
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for H05.129 in this effective period.
Excludes 1
OfficialICD-10-CM does not list Excludes 1 notes for H05.129 in this effective period.
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for H05.129 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for H05.129 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for H05.129 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 H05.129 an HCC code?
No. H05.129 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.
- Code
- H05.129
- Description
- Orbital myositis, unspecified orbit
- 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
H05.129 is the ICD-10-CM diagnosis code for orbital myositis, unspecified orbit. Inflammation of the eye socket muscles when the affected eye is not specified. H05.129 sits in the ICD-10-CM chapter for diseases of the eye and adnexa (h00-h59), within the section covering disorders of eyelid, lacrimal system and orbit (h00-h05).
H05.129 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.
This is a default code; query provider for laterality documentation to assign a more specific code.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for H05.129 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •This is a default code; query provider for laterality documentation to assign a more specific code
- •Review imaging reports and clinical notes for clues about which eye is involved