Other osteochondrodysplasias (Q78) ICD-10-CM
The Q78 code range covers other osteochondrodysplasias with 10 ICD-10-CM diagnosis codes. 9 of them are billable and valid for claim submission in fiscal year 2027, and the category headers group them but cannot themselves be billed.
Type 2 Excludes
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
- congenital myotonic chondrodystrophy G71.13
Codes in the Q78 Range 10 codes · 9 billable
- Q78 Other osteochondrodysplasiasNon-billable
- Q78.0 Osteogenesis imperfecta
- Q78.1 Polyostotic fibrous dysplasia
- Q78.2 Osteopetrosis
- Q78.3 Progressive diaphyseal dysplasia
- Q78.4 Enchondromatosis
- Q78.5 Metaphyseal dysplasia
- Q78.6 Multiple congenital exostoses
- Q78.8 Other specified osteochondrodysplasias
- Q78.9 Osteochondrodysplasia, unspecified
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the Q78 range.
Camurati-Engelmann Syndrome
An autosomal dominant form of dysplasia that is characterized by progressive thickening of diaphyseal cortex of long bones. Mutations in the gene that encodes TRANSFORMING GROWTH FACTOR BETA1 are one cause of this disorder.
Chondrodysplasia Punctata
A heterogeneous group of bone dysplasias, the common character of which is stippling of the epiphyses in infancy. The group includes a severe autosomal recessive form (CHONDRODYSPLASIA PUNCTATA, RHIZOMELIC), an autosomal dominant form (Conradi-Hunermann syndrome), and a milder X-linked form. Metabolic defects associated with impaired peroxisomes are present only in the rhizomelic form.
Enchondromatosis
Benign growths of cartilage in the metaphyses of several bones.
Exostoses, Multiple Hereditary
Hereditary disorder transmitted by an autosomal dominant gene and characterized by multiple exostoses (multiple osteochondromas) near the ends of long bones. The genetic abnormality results in a defect in the osteoclastic activity at the metaphyseal ends of the bone during the remodeling process in childhood or early adolescence. The metaphyses develop benign, bony outgrowths often capped by cartilage. A small number undergo neoplastic transformation.
Fibrous Dysplasia, Polyostotic
FIBROUS DYSPLASIA OF BONE affecting several bones. When melanotic pigmentation (CAFE-AU-LAIT SPOTS) and multiple endocrine hyperfunction are additionally associated it is referred to as Albright syndrome.
Osteochondrodysplasias
Abnormal development of cartilage and bone.
Osteogenesis Imperfecta
COLLAGEN DISEASES characterized by brittle, osteoporotic, and easily fractured bones. It may also present with blue sclerae, loose joints, and imperfect dentin formation. Most types are autosomal dominant and are associated with mutations in COLLAGEN TYPE I.
Osteopetrosis
Excessive formation of dense trabecular bone leading to pathological fractures; OSTEITIS; SPLENOMEGALY with infarct; ANEMIA; and extramedullary hemopoiesis (HEMATOPOIESIS, EXTRAMEDULLARY).
Osteopoikilosis
An asymptomatic, autosomal dominant trait in which pea-sized sclerotic spots, prominent in the metaphyseal area, are accompanied by unique cutaneous lesions. These are yellowish papules or plaques with increased elastin content. (From Cecil Textbook of Medicine, 19th ed, pp1434-35)
Synostosis
A union between adjacent bones or parts of a single bone formed by osseous material, such as ossified connecting cartilage or fibrous tissue. (Dorland, 27th ed)
About the Q78 Code Range
These are congenital bone and cartilage conditions within the musculoskeletal system, grouped as osteochondrodysplasias.
The subdivisions identify named conditions, including osteogenesis imperfecta (Q78.0) and osteopetrosis (Q78.2). Others distinguish forms of dysplasia or identify multiple congenital exostoses. Q78.8 is for other specified osteochondrodysplasias; Q78.9 is for an unspecified osteochondrodysplasia.
Questions About This Page
How many billable codes are in the Q78 range?
Of the 10 codes in this range, 9 are billable and valid for claim submission from October 1, 2026 through September 30, 2027. Category header codes group them but cannot be reported on claims.
What does the Q78 range classify?
The range classifies other osteochondrodysplasias. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
