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ICD-10-CM 2027

ICD-10 code for unstable keratoconus

H18.62

Keratoconus, unstable

Header — needs a more specific code

From the official ICD-10-CM alphabetic index entry “Keratoconus › unstable”. Page updated September 29, 2026.

About coding unstable keratoconus

The ICD-10-CM code for unstable keratoconus is H18.62 (Keratoconus, unstable).

Within H18.6 (Keratoconus), H18.62 is specifically for Keratoconus, unstable. Related codes cover unspecified (H18.60) and stable (H18.61).

To report this condition, pick the subcode that matches the documentation: H18.621 (right eye), H18.622 (left eye), H18.623 (bilateral) and H18.629 (unspecified eye).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Common questions about unstable keratoconus ICD-10 codes

What is the ICD-10 code for unstable keratoconus?

H18.62 — Keratoconus, unstable (a header code; report a more specific subcode).

Is H18.62 billable?

No. H18.62 is a header code. Report one of its more specific subcodes instead.