Q77.4 Achondroplasia

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

Applicable to

• Hypochondroplasia
• Osteosclerosis congenita

Applies from Q77 Osteochondrodysplasia with defects of growth of tubular bones and spine

Excludes1 (never code together)

• mucopolysaccharidosis (E76.0-E76.3)

Excludes2 (not included here)

• congenital myotonic chondrodystrophy (G71.13)

MS-DRG index

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

Approximate ICD-9-CM (GEMs)

• 756.4 Chondrodystrophy (approximate)

Code annotations containing back-references to Q77.4

Back-references to Q77.4

• Type 1 Excludes: E34.3 Short stature due to endocrine disorder ("achondroplastic short stature (Q77.4)")
• Type 1 Excludes: E34.3 Short stature due to endocrine disorder ("hypochondroplastic short stature (Q77.4)")
• Type 1 Excludes: M85.8 Other specified disorders of bone density and structure ("osteosclerosis congenita (Q77.4)")

Back-references to Q77

• 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 Q77.4

• Achondroplasia (osteosclerosis congenita)
• Chondrodysplasia › fetalis
• Chondrogenesis imperfecta
• Dwarfism › achondroplastic
• Dwarfism › hypochondroplastic
• Hypochondroplasia
• Osteosclerosis › congenita

Nearby codes

• Q77 Osteochondrodysplasia with defects of growth of tubular bones and spine
• Q77.0 Achondrogenesis
• Q77.1 Thanatophoric short stature
• Q77.2 Short rib syndrome
• Q77.3 Chondrodysplasia punctata
• Q77.4 Achondroplasia (this code)
• Q77.5 Diastrophic dysplasia
• Q77.6 Chondroectodermal dysplasia
• Q77.7 Spondyloepiphyseal dysplasia
• Q77.8 Other osteochondrodysplasia with defects of growth of tubular bones and spine
• Q77.9 Osteochondrodysplasia with defects of growth of tubular bones and spine, unspecified