H21.213 ICD-10-CM Code: Degeneration of chamber angle, bilateral
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 sclera, cornea, iris and ciliary body (H15-H22)
H21.213
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceDegeneration of chamber angle, bilateral
This condition involves the deterioration of the drainage system (chamber angle) in both eyes, which can affect how fluid drains from the eye and potentially lead to increased eye pressure. It is a structural problem in the eye that may develop over time.
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 H21.213 in this effective period.
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for H21.213 in this effective period.
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for H21.213 in this effective period.
Excludes 1
OfficialICD-10-CM does not list Excludes 1 notes for H21.213 in this effective period.
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for H21.213 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for H21.213 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for H21.213 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 H21.213 an HCC code?
No. H21.213 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.
- Code
- H21.213
- Description
- Degeneration of chamber angle, bilateral
- HCC (V28)
- No CMS-HCC V28 mapping
- RAF
- —
- Billable
- Yes
- Payment year
- 2026
Coder workflow notes
Get the V28 RAF + MEAT cheat sheet
One printable page: confirm a code's V28 HCC status, its RAF weight, and the MEAT your note needs to make it stick. 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
H21.213 is the ICD-10-CM diagnosis code for degeneration of chamber angle, bilateral. This condition involves the deterioration of the drainage system (chamber angle) in both eyes, which can affect how fluid drains from the eye and potentially lead to increased eye pressure. It is a structural problem in the eye that may develop over time. H21.213 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).
H21.213 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 that the condition is documented as bilateral (affecting both eyes) before assigning this code; if only one eye is affected, use the unilateral code H21.211 instead.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for H21.213 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Verify that the condition is documented as bilateral (affecting both eyes) before assigning this code; if only one eye is affected, use the unilateral code H21.211 instead
- •This code is typically used in ophthalmology records and may be associated with glaucoma risk; review clinical documentation to determine if additional glaucoma codes should be assigned