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 2026, 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.
Anetoderma
Benign DERMATOSIS caused by a loss of dermal ELASTIC TISSUE resulting in localized sac-like areas of flaccid skin. It can be either primary (idiopathic) or secondary to other skin conditions, PENICILLAMINE use, or premature birth.
Dental Pulp Calcification
CALCINOSIS of the DENTAL PULP or ROOT CANAL.
Dentin Dysplasia
An apparently hereditary disorder of dentin formation, marked by a normal appearance of coronal dentin associated with pulpal obliteration, faulty root formation, and a tendency for peripheral lesions without obvious cause. (From Dorland, 27th ed)
Dentinogenesis Imperfecta
An autosomal dominant disorder of tooth development characterized by opalescent dentin resulting in discoloration of the teeth. The dentin develops poorly with low mineral content while the pulp canal is obliterated.
Enchondromatosis
Benign growths of cartilage in the metaphyses of several bones.
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)
Osteosclerosis
An abnormal hardening or increased density of bone tissue.
About the Q78 Code Range
The Q78 ICD-10 code section covers a group of rare congenital bone disorders collectively known as other osteochondrodysplasias. These codes identify various inherited or developmental conditions affecting bone and cartilage growth and density, each with unique clinical features and diagnostic criteria.
This section includes disorders such as osteogenesis imperfecta (Q78.0), often referred to by synonyms like "brittle bone disease" or "dentinogenesis imperfecta," used to classify fragile bones with abnormal collagen formation. Polyostotic fibrous dysplasia (Q78.1), linked to conditions like McCune-Albright syndrome and "café au lait spots," involves fibrous tissue replacing normal bone. Osteopetrosis (Q78.2) includes variants known as "marble bone disease," characterized by unusually dense bones prone to fractures. Other codes cover progressive diaphyseal dysplasia (Q78.3), enchondromatosis (Q78.4) also known as Maffucci syndrome, and metaphyseal dysplasia (Q78.5), all affecting various parts of bone structure and growth patterns. The Q78.6 code covers multiple congenital exostoses, identifiable by multiple benign bone growths. Q78.8 is used for other specified osteochondrodysplasias with diverse syndromes, while Q78.9 applies to unspecified forms of osteochondrodysplasia.
Medical coders use these specific ICD-10 codes for accurate classification and reporting of rare skeletal dysplasias, facilitating precise diagnosis, research, and patient management related to these complex bone growth disorders.
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, 2025 through September 30, 2026. 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 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
