H52.21Header code — not billable
Irregular astigmatism
- Chapter
- 7. Diseases of the eye and adnexa
- Category
- H52
- Effective date
- October 1, 2026
Related codes in category H52
H52Disorders of refraction and accommodationH52.0HypermetropiaH52.00Hypermetropia, unspecified eyeYesH52.01Hypermetropia, right eyeYesH52.02Hypermetropia, left eyeYesH52.03Hypermetropia, bilateralYesH52.1MyopiaH52.10Myopia, unspecified eyeYesH52.11Myopia, right eyeYesH52.12Myopia, left eyeYesH52.13Myopia, bilateralYesH52.2Astigmatism
Frequently asked questions
What is ICD-10 code H52.21?
H52.21 is an ICD-10-CM diagnosis code for Irregular astigmatism.
Is H52.21 a billable code?
No. H52.21 is a category/header code, not billable on its own — use one of its more specific child codes instead.
What ICD-10-CM chapter is H52.21 in?
H52.21 falls under Chapter 7: Diseases of the eye and adnexa.
When did H52.21 become effective?
H52.21 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.
What other codes are related to H52.21?
H52.21 belongs to category H52, which includes 12 other codes — see the related codes list on this page.
ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.