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
  • Q55.7|

    Congenital vasocutaneous fistula

  • Q55.8|

    Other specified congenital malformations of male genital organs

  • Q55.9|

    Congenital malformation of male genital organ, unspecified

  • Q56.0|

    Hermaphroditism, not elsewhere classified

  • Q56.1|

    Male pseudohermaphroditism, not elsewhere classified

  • Q56.2|

    Female pseudohermaphroditism, not elsewhere classified

  • Q56.3|

    Pseudohermaphroditism, unspecified

  • Q56.4|

    Indeterminate sex, unspecified

  • Q60.0|

    Renal agenesis, unilateral

  • Q60.1|

    Renal agenesis, bilateral

  • Q60.2|

    Renal agenesis, unspecified

  • Q60.3|

    Renal hypoplasia, unilateral

  • Q60.4|

    Renal hypoplasia, bilateral

  • Q60.5|

    Renal hypoplasia, unspecified

  • Q60.6|

    Potter's syndrome

  • Q61.00|

    Congenital renal cyst, unspecified

  • Q61.01|

    Congenital single renal cyst

  • Q61.02|

    Congenital multiple renal cysts

  • Q61.11|

    Cystic dilatation of collecting ducts

  • Q61.19|

    Other polycystic kidney, infantile type

  • Q61.2|

    Polycystic kidney, adult type

  • Q61.3|

    Polycystic kidney, unspecified

  • Q61.4|

    Renal dysplasia

  • Q61.5|

    Medullary cystic kidney

  • Q61.8|

    Other cystic kidney diseases

  • Q61.9|

    Cystic kidney disease, unspecified

  • Q62.0|

    Congenital hydronephrosis

  • Q62.10|

    Congenital occlusion of ureter, unspecified

  • Q62.11|

    Congenital occlusion of ureteropelvic junction

  • Q62.12|

    Congenital occlusion of ureterovesical orifice

  • Q62.2|

    Congenital megaureter

  • Q62.31|

    Congenital ureterocele, orthotopic

  • Q62.32|

    Cecoureterocele

  • Q62.39|

    Other obstructive defects of renal pelvis and ureter

  • Q62.4|

    Agenesis of ureter

  • Q62.5|

    Duplication of ureter

  • Q62.60|

    Malposition of ureter, unspecified

  • Q62.61|

    Deviation of ureter

  • Q62.62|

    Displacement of ureter

  • Q62.63|

    Anomalous implantation of ureter

  • Q62.69|

    Other malposition of ureter

  • Q62.7|

    Congenital vesico-uretero-renal reflux

  • Q62.8|

    Other congenital malformations of ureter

  • Q63.0|

    Accessory kidney

  • Q63.1|

    Lobulated, fused and horseshoe kidney

  • Q63.2|

    Ectopic kidney

  • Q63.3|

    Hyperplastic and giant kidney

  • Q63.8|

    Other specified congenital malformations of kidney

  • Q63.9|

    Congenital malformation of kidney, unspecified

  • Q64.0|

    Epispadias

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