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H21.54

Non-billable

Posterior synechiae (iris)

H21.54 is the ICD-10-CM code for Posterior synechiae (iris). It is a non-billable category code — use a more specific child code such as H21.541 for billing.

Status
Header (non-billable)
Chapter
H00-H59
Parent
H21.5
Subcodes
4
Edition
FY2026

H00-H59 Diseases of the eye and adnexa

No additional coding notes for this code.

Frequently asked questions

What is ICD-10 code H21.54?
H21.54 is the ICD-10-CM code for "Posterior synechiae (iris)". It falls under H00-H59 Diseases of the eye and adnexa.
Is H21.54 a billable code?
No — H21.54 is a non-billable header code. Use a more specific child code (such as H21.541) for billing.
What are the subcodes of H21.54?
H21.54 has 4 more specific child codes, including H21.541, H21.542, H21.543.

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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