Congenital malformations and deformations of the musculoskeletal system (Q65-Q79) ICD-10-CM
The Q65–Q79 section covers congenital malformations and deformations of the musculoskeletal system with 321 ICD-10-CM diagnosis codes, of which 255 are billable in fiscal year 2026. The section is organized into the 15 code ranges listed below.
Code Ranges in This Section 15 ranges · 321 codes
The info icon previews the code ranges inside each row and its instructional notations from the official Tabular List.
About the Q65–Q79 Code Range
ICD-10 codes Q65-Q79 cover congenital malformations and deformities of the musculoskeletal system. This range includes specific diagnoses related to abnormalities present from birth affecting bones, joints, limbs, and the spine, such as congenital hip deformities, limb reduction defects, craniosynostosis, and osteochondrodysplasias.
Within this broad group, codes like Q65 describe congenital deformities of the hip, including various types of congenital dislocation and subluxation, often referred to as congenital hip dysplasia. For instance, terms like "congenital subluxation of hip" and "bilateral congenital dislocation of hip" link directly to codes in this subcategory. Codes in the Q66 series address congenital foot deformities such as talipes equinovarus (clubfoot) and pes planus, with detailed locations (right, left, or unspecified). Congenital anomalies of limbs and reduction defects—including complete or partial absence of limbs—are categorized under Q71-Q74, which include terms like phocomelia and lobster-claw hand. Codes Q75 address congenital malformations of skull and face bones, including craniosynostosis, while Q76 codes specify congenital spine and thorax malformations (e.g., spina bifida occulta and Klippel-Feil syndrome). The Q77-Q78 range covers osteochondrodysplasias—hereditary disorders affecting bone growth like achondroplasia and osteogenesis imperfecta. Lastly, Q79 captures other musculoskeletal malformations not elsewhere classified, such as Ehlers-Danlos syndromes and congenital diaphragmatic hernia.
This classification enables precise coding of various congenital musculoskeletal conditions, many with synonymous terms included here to aid coding accuracy. Understanding this range supports accurate diagnosis coding for conditions like developmental hip dislocation, limb hypoplasia, complex craniofacial anomalies, and inherited bone disorders, facilitating clear communication in healthcare and insurance documentation.
Questions About This Page
How many codes are in the Q65-Q79 range?
The Q65-Q79 range contains 321 ICD-10-CM diagnosis codes in FY 2026. 255 of them are billable, and the rest are category headers that organize the section.
What conditions does Q65-Q79 cover?
The range covers congenital malformations and deformations of the musculoskeletal system. The code ranges listed above break it into groups of related conditions, and each one links to its own page with the full code list.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
