ICD-10-CM 2027 diagnosis code

Q12Congenital lens malformations

Not billable — use a more specific code

Q12 is a header code, so it can't be reported by itself. Choose one of the 7 more specific codes beneath it.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About Q12

Q12 is the ICD-10-CM diagnosis code for congenital lens malformations. It belongs to block Q10-Q18 (congenital malformations of eye, ear, face and neck) and chapter 17 (congenital malformations, deformations, chromosomal abnormalities, and genetic disorders). It is a header code, so it can't be reported by itself; one of its 7 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: Q12.0 (cataract), Q12.1 (lens), Q12.2 (lens), Q12.3 (aphakia), Q12.4 (Spherophakia), Q12.8 (malformations) and Q12.9 (unspecified).

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

Specific codes under Q12

Notes that apply from higher levels

Instructions written at a parent level also apply to Q12.

Broader instructions also apply from Q10-Q18 Congenital malformations of eye, ear, face and neck and Chapter 17: Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders.

Codes whose notes reference Q12

H27Excludes1

Code history

2016
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2021
2022
2023
2024
2025
2026
2027

FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
No changes since FY2016.

Common questions about Q12

Is Q12 billable?: No. Q12 is a header code. Report one of its more specific subcodes instead.