Chapter 17

Q00–Q99: Congenital Malformations, Deformations and Chromosomal Abnormalities

Congenital Malformations, Deformations and Chromosomal Abnormalities diagnostic classification updated for 2026.

Chapter Instructions

Excludes2(Not included here. Code separately if applicable.)
  • inborn errors of metabolism (E70-E88)
Internal Codes
  • Q72.03|

    Congenital complete absence of lower limb, bilateral

  • Q72.10|

    Congenital absence of unspecified thigh and lower leg with foot present

  • Q72.11|

    Congenital absence of right thigh and lower leg with foot present

  • Q72.12|

    Congenital absence of left thigh and lower leg with foot present

  • Q72.13|

    Congenital absence of thigh and lower leg with foot present, bilateral

  • Q72.20|

    Congenital absence of both lower leg and foot, unspecified lower limb

  • Q72.21|

    Congenital absence of both lower leg and foot, right lower limb

  • Q72.22|

    Congenital absence of both lower leg and foot, left lower limb

  • Q72.23|

    Congenital absence of both lower leg and foot, bilateral

  • Q72.30|

    Congenital absence of unspecified foot and toe(s)

  • Q72.31|

    Congenital absence of right foot and toe(s)

  • Q72.32|

    Congenital absence of left foot and toe(s)

  • Q72.33|

    Congenital absence of foot and toe(s), bilateral

  • Q72.40|

    Longitudinal reduction defect of unspecified femur

  • Q72.41|

    Longitudinal reduction defect of right femur

  • Q72.42|

    Longitudinal reduction defect of left femur

  • Q72.43|

    Longitudinal reduction defect of femur, bilateral

  • Q72.50|

    Longitudinal reduction defect of unspecified tibia

  • Q72.51|

    Longitudinal reduction defect of right tibia

  • Q72.52|

    Longitudinal reduction defect of left tibia

  • Q72.53|

    Longitudinal reduction defect of tibia, bilateral

  • Q72.60|

    Longitudinal reduction defect of unspecified fibula

  • Q72.61|

    Longitudinal reduction defect of right fibula

  • Q72.62|

    Longitudinal reduction defect of left fibula

  • Q72.63|

    Longitudinal reduction defect of fibula, bilateral

  • Q72.70|

    Split foot, unspecified lower limb

  • Q72.71|

    Split foot, right lower limb

  • Q72.72|

    Split foot, left lower limb

  • Q72.73|

    Split foot, bilateral

  • Q72.811|

    Congenital shortening of right lower limb

  • Q72.812|

    Congenital shortening of left lower limb

  • Q72.813|

    Congenital shortening of lower limb, bilateral

  • Q72.819|

    Congenital shortening of unspecified lower limb

  • Q72.891|

    Other reduction defects of right lower limb

  • Q72.892|

    Other reduction defects of left lower limb

  • Q72.893|

    Other reduction defects of lower limb, bilateral

  • Q72.899|

    Other reduction defects of unspecified lower limb

  • Q72.90|

    Unspecified reduction defect of unspecified lower limb

  • Q72.91|

    Unspecified reduction defect of right lower limb

  • Q72.92|

    Unspecified reduction defect of left lower limb

  • Q72.93|

    Unspecified reduction defect of lower limb, bilateral

  • Q73.0|

    Congenital absence of unspecified limb(s)

  • Q73.1|

    Phocomelia, unspecified limb(s)

  • Q73.8|

    Other reduction defects of unspecified limb(s)

  • Q74.0|

    Other congenital malformations of upper limb(s), including shoulder girdle

  • Q74.1|

    Congenital malformation of knee

  • Q74.2|

    Other congenital malformations of lower limb(s), including pelvic girdle

  • Q74.3|

    Arthrogryposis multiplex congenita

  • Q74.8|

    Other specified congenital malformations of limb(s)

  • Q74.9|

    Unspecified congenital malformation of limb(s)

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