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
  • Q70.23|

    Fused toes, bilateral

  • Q70.30|

    Webbed toes, unspecified foot

  • Q70.31|

    Webbed toes, right foot

  • Q70.32|

    Webbed toes, left foot

  • Q70.33|

    Webbed toes, bilateral

  • Q70.4|

    Polysyndactyly, unspecified

  • Q70.9|

    Syndactyly, unspecified

  • Q71.00|

    Congenital complete absence of unspecified upper limb

  • Q71.01|

    Congenital complete absence of right upper limb

  • Q71.02|

    Congenital complete absence of left upper limb

  • Q71.03|

    Congenital complete absence of upper limb, bilateral

  • Q71.10|

    Congenital absence of unspecified upper arm and forearm with hand present

  • Q71.11|

    Congenital absence of right upper arm and forearm with hand present

  • Q71.12|

    Congenital absence of left upper arm and forearm with hand present

  • Q71.13|

    Congenital absence of upper arm and forearm with hand present, bilateral

  • Q71.20|

    Congenital absence of both forearm and hand, unspecified upper limb

  • Q71.21|

    Congenital absence of both forearm and hand, right upper limb

  • Q71.22|

    Congenital absence of both forearm and hand, left upper limb

  • Q71.23|

    Congenital absence of both forearm and hand, bilateral

  • Q71.30|

    Congenital absence of unspecified hand and finger

  • Q71.31|

    Congenital absence of right hand and finger

  • Q71.32|

    Congenital absence of left hand and finger

  • Q71.33|

    Congenital absence of hand and finger, bilateral

  • Q71.40|

    Longitudinal reduction defect of unspecified radius

  • Q71.41|

    Longitudinal reduction defect of right radius

  • Q71.42|

    Longitudinal reduction defect of left radius

  • Q71.43|

    Longitudinal reduction defect of radius, bilateral

  • Q71.50|

    Longitudinal reduction defect of unspecified ulna

  • Q71.51|

    Longitudinal reduction defect of right ulna

  • Q71.52|

    Longitudinal reduction defect of left ulna

  • Q71.53|

    Longitudinal reduction defect of ulna, bilateral

  • 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

  • Q71.811|

    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

  • Q71.891|

    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

  • Q71.90|

    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

  • Q72.00|

    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

PreviousPage 12 of 18Next