Q74.1 Congenital malformation of knee

Billable ICD-10-CM code, FY2026. Exempt from present-on-admission (POA) reporting.

Applicable to

• Congenital absence of patella
• Congenital dislocation of patella
• Congenital genu valgum
• Congenital genu varum
• Rudimentary patella

Excludes1 (never code together)

• congenital dislocation of knee (Q68.2)
• congenital genu recurvatum (Q68.2)
• nail patella syndrome (Q87.2)

Applies from Q74 Other congenital malformations of limb(s)

Excludes1 (never code together)

• polydactyly (Q69.-)
• reduction defect of limb (Q71-Q73)
• syndactyly (Q70.-)

MS-DRG index

Defines the logic of DRG(s) 564-566 in MDC 08.

Approximate ICD-9-CM (GEMs)

• 755.64 Congenital deformity of knee (joint) (approximate)

Code annotations containing back-references to Q74.1

Back-references to Q74

• Type 1 Excludes: M20 Acquired deformities of fingers and toes ("congenital deformities and malformations of fingers and toes (Q66.-, Q68-Q70, Q74.-)")
• Type 1 Excludes: M21 Other acquired deformities of limbs ("congenital deformities and malformations of limbs (Q65-Q66, Q68-Q74)")
• Type 1 Excludes: M24.3 Pathological dislocation of joint, not elsewhere classified ("congenital dislocation or displacement of joint- see congenital malformations and deformations of the musculoskeletal system (Q65-Q79)")
• Type 2 Excludes: M95 Other acquired deformities of musculoskeletal system and connective tissue ("congenital malformations and deformations of the musculoskeletal system (Q65-Q79)")

Diagnosis Index entries for Q74.1

• Absence (of) (organ or part) (complete or partial) › patella, congenital
• Agenesis › patella
• Anomaly, anomalous (congenital) (unspecified type) › knee
• Anomaly, anomalous (congenital) (unspecified type) › patella
• Bifid (congenital) › patella
• Biparta, bipartite › patella
• Dislocation (articular) › patella › congenital
• Elongated, elongation (congenital) › ligamentum patellae
• Genu › congenital
• Genu › extrorsum (acquired) › congenital
• Genu › introrsum (acquired) › congenital
• Genu › valgum (acquired) (knock-knee) › congenital
• Genu › varum (acquired) (bowleg) › congenital
• Hypertrophy, hypertrophic › meniscus, knee, congenital
• Hypoplasia, hypoplastic › patella
• Knock knee (acquired) › congenital
• Malposition › congenital › patella
• Rudimentary (congenital) › patella

Nearby codes

• Q74 Other congenital malformations of limb(s)
• Q74.0 Other congenital malformations of upper limb(s), including shoulder girdle
• Q74.1 Congenital malformation of knee (this code)
• 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)