Q77.9 Osteochondrodysplasia with defects of growth of tubular bones and spine, unspecified

ICD-10-CM Q77.9: Osteochondrodysplasia with defects of growth of tubular bones and spine, unspecified

ICD-10-CM code Q77.9 represents an unspecified congenital abnormality involving osteochondrodysplasia with defects of growth of tubular bones and spine. The terminology is active and falls under the broader parent category Q77. Clinical references describe osteochondrodysplasias as inherited abnormalities of bone, cartilage, or connective tissue development. 1 5 6

Plain-language overview

Osteochondrodysplasias are inherited abnormalities involving the growth and development of connective tissue, bone, or cartilage, and they encompass a heterogeneous group of over 350 associated disorders. 5 6

This group of disorders is associated with skeletal maldevelopment and varying degrees of short stature or dwarfism, which is frequently linked to disproportionate growth of the trunk and extremities. 5 6

What this code represents

Code Q77.9 represents the diagnosis of osteochondrodysplasia with defects of growth of tubular bones and spine, unspecified, and its semantic type is classified as a congenital abnormality. 1

The Q77.9 terminology record is active for the 2026 version of ICD-10-CM, and it has narrower concepts within the terminology system, indicating further specification is possible. 1

Coding details

The code Q77.9 is nested under the parent concept Q77, which covers osteochondrodysplasia with defects of growth of tubular bones and spine, and the terminology record includes a published abbreviation. 1 4

Within the same coding category, Q77.9 is listed alongside Q77.8, which is labeled in the source text as other osteochondrodysplasia with defects of growth of tubular bones and spine. 3

Documentation considerations

Clinical references state that osteochondrodysplasias are classified based on the causative gene defect, biochemical pathway, or clinical and radiographic features, and that molecular diagnosis may be diagnostic for known defects. 5 6

What the sources add

While terminology records establish the official code hierarchy and active status, clinical references add that these conditions are classified based on causative gene defect, biochemical pathway, or clinical and radiographic features. 1 5 6

Terminology sources provide the official published abbreviation for this code, which is osteochndrdys w defct of grth of tublr bones and spine, unsp., for use in standardized systems. 1

Sources

1. ICD-10-CM Q77.9 terminology record — National Cancer Institute Enterprise Vocabulary Services; accessed 2026-07-27.
2. EVS Explore — evsexplore.semantics.cancer.gov; accessed 2026-07-27.
3. EVS Explore — evsexplore.semantics.cancer.gov; accessed 2026-07-27.
4. Browse Code Systems — vsac.nlm.nih.gov; accessed 2026-07-27.
5. Osteochondrodysplasias (Osteochondrodysplastic Dwarfism) - Pediatrics - MSD Manual Professional Edition — msdmanuals.com; accessed 2026-07-27.
6. Osteochondrodysplasias (Osteochondrodysplastic Dwarfism) - Pediatrics - Merck Manual Professional Edition — merckmanuals.com; accessed 2026-07-27.