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H21.21

H21.21: Degeneration of chamber angle

Non-billable headerICD-10-CM

H21.21 is a non-billable header ICD-10-CM code for degeneration of chamber angle. It cannot be billed on its own: choose one of the more specific child codes below.

Excludes2 inherited from the categories above H21.21

Not part of this code, but both may be coded when both are present.

Written on H21: Other disorders of iris and ciliary body

  • sympathetic uveitis (H44.1-)

Risk adjustment

No CMS-HCC V28 category: this code does not change a RAF score.

Code history

Unchanged in every release from FY2024 to FY2027.

Code to one of these instead H21.21

4 child codes. Green means billable.

Other codes under H21.2

ICD-10-CMFY2027· effective October 1, 2026

Loaded directly from the CMS/NCHS ICD-10-CM public-domain release: see data sources and our editorial policy. If this page disagrees with the CMS tabular list, this page is wrong. Reference information for professional coders; not medical or billing advice.