H27 vs Q12

H27 (Other disorders of lens) compared with Q12 (Congenital lens malformations), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.

Can these codes be reported together?

No — do not report together. H27 carries an Excludes1 note covering Q12: “congenital lens malformations (Q12.-)”

Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).

Side by side

	H27Other disorders of lens	Q12Congenital lens malformations
Billing status	Non-billable header Report instead: H27.00, H27.01, H27.02, H27.03, H27.10	Non-billable header Report instead: Q12.0, Q12.1, Q12.2, Q12.3, Q12.4
Classification	H00-H59 — Diseases of the Eye and Adnexa (H00-H59)	Q00-Q99 — Congenital Malformations, Deformations and Chromosomal Abnormalities (Q00-Q99)
Definition	Other disorders of lens is a non-billable ICD-10-CM category code (H27).	Congenital lens malformations is a non-billable ICD-10-CM category code (Q12).

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Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources