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
  • Q71.6|

    Lobster-claw hand

  • Q71.60|

    Lobster-claw hand, unspecified hand

  • Q71.61|

    Lobster-claw right hand

  • Q71.62|

    Lobster-claw left hand

  • Q71.63|

    Lobster-claw hand, bilateral

  • Q71.8|

    Other reduction defects of upper limb

  • Q71.81|

    Congenital shortening of upper limb

  • Q71.811|

    Congenital shortening of right upper limb

  • Q71.812|

    Congenital shortening of left upper limb

  • Q71.813|

    Congenital shortening of upper limb, bilateral

  • Q71.819|

    Congenital shortening of unspecified upper limb

  • Q71.89|

    Other reduction defects of upper limb

  • Q71.891|

    Other reduction defects of right upper limb

  • Q71.892|

    Other reduction defects of left upper limb

  • Q71.893|

    Other reduction defects of upper limb, bilateral

  • Q71.899|

    Other reduction defects of unspecified upper limb

  • Q71.9|

    Unspecified reduction defect of upper limb

  • Q71.90|

    Unspecified reduction defect of unspecified upper limb

  • Q71.91|

    Unspecified reduction defect of right upper limb

  • Q71.92|

    Unspecified reduction defect of left upper limb

  • Q71.93|

    Unspecified reduction defect of upper limb, bilateral

  • Q72|

    Reduction defects of lower limb

  • Q72.0|

    Congenital complete absence of lower limb

  • Q72.00|

    Congenital complete absence of unspecified lower limb

  • Q72.01|

    Congenital complete absence of right lower limb

  • Q72.02|

    Congenital complete absence of left lower limb

  • Q72.03|

    Congenital complete absence of lower limb, bilateral

  • Q72.1|

    Congenital absence of thigh and lower leg with foot present

  • 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

  • Q72.2|

    Congenital absence of both lower leg and foot

  • 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

  • Q72.3|

    Congenital absence of foot and toe(s)

  • 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

  • Q72.4|

    Longitudinal reduction defect of femur

  • 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

  • Q72.5|

    Longitudinal reduction defect of tibia

  • Q72.50|

    Longitudinal reduction defect of unspecified tibia

  • Q72.51|

    Longitudinal reduction defect of right tibia

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