If you have feedback, let us know.

IPCCC ICD-11 Congenital Heart Atlas

You are here: Left hand pattern ventricular topology Visceral heterotaxy Congenital anomaly of position or spatial relationships of thoraco-abdominal organs Structural developmental anomaly of heart or great vessels

IPCCC Term Left hand pattern ventricular topology
IPCCC Code 02.03.02
ICD-11 Code 1819755421


A congenital cardiac malformation in which the chirality, or handedness, of the ventricles is mirror image of normal, also known as L-loop.


L-loop ventricles, Levo-ventricular looping, Sinistro-ventricular looping, L-bulboventricular loop

STS-EACTS-derived IPCCC term

Ventricular topology, Left hand pattern ventricular topology (L-Loop)

EPCC-derived IPCCC term

Left hand pattern ventricular topology (L loop) (segmental nomenclature letter 2: 'L')

ICD-11 MMS code or crossmap

LA81*: This Foundation term is listed as an index term under the term "Abnormal ventricular relationships" and can be crossmapped to this MMS term by using ICD-11MMS code LA81.

ICD-10 MMS code or crossmap

Q20.9**: This Foundation term is not in ICD-10. If coding using ICD-10, crossmap to “Congenital malformation of cardiac chambers and connections, unspecified” with code Q20.9


Visceral heterotaxy


Coding Notes

Chirality or handedness with a left-handed right ventricle and means likening the morphological right ventricle to a left hand by representing the inflow by the thumb, outflow by the index finger, and septum by the palm. An example is congenitally corrected transposition of great arteries.

© Copyright - ISNPCHD - Developed and supported by Becker Associates, a Canadian Association Management Company