Congenital lens malformations (Q12) ICD-10-CM
The Q12 code range covers congenital lens malformations with 8 ICD-10-CM diagnosis codes. 7 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Codes in the Q12 Range 8 codes · 7 billable
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the Q12 range.
Endocardial Fibroelastosis
A condition characterized by the thickening of ENDOCARDIUM due to proliferation of fibrous and elastic tissue, usually in the left ventricle leading to impaired cardiac function (CARDIOMYOPATHY, RESTRICTIVE). It is most commonly seen in young children and rarely in adults. It is often associated with congenital heart anomalies (HEART DEFECTS CONGENITAL;) INFECTION; or gene mutation. Defects in the tafazzin protein, encoded by TAZ gene, result in a form of autosomal dominant familial endocardial fibroelastosis.
About the Q12 Code Range
The ICD-10 code section Q12 covers congenital lens malformations, which include various birth defects affecting the eye’s lens structure from cataracts to lens displacement. These codes help specify different types of lens abnormalities diagnosed at or shortly after birth.
The most commonly used code, Q12.0, refers to congenital cataract, which encompasses numerous specific cataract types such as pulverulent, lamellar, or posterior polar cataracts. Synonyms like Hutterite type cataract and familial cataract syndromes aid coders in accurately linking clinical terminology to this code. Q12.1 describes congenital displaced lens, also called ectopia lentis, which involves the lens shifting from its normal position. The code Q12.2 is assigned to coloboma of lens, a condition with lens defects due to incomplete development. Other codes include Q12.3 for congenital aphakia (absence of the lens), Q12.4 for spherophakia (abnormally spherical lens), and Q12.8 covering other rare lens malformations like lenticonus and persistent fetal vasculature. Q12.9 is used when the congenital lens malformation is unspecified but suspected based on anomalies like lens shape or pigmentation. These codes assist healthcare professionals in precisely documenting and billing for various congenital lens defects encountered in ophthalmology.
Questions About This Page
How many billable codes are in the Q12 range?
Of the 8 codes in this range, 7 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the Q12 range classify?
The range classifies congenital lens malformations. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
