Q79.9 Congenital malformation of musculoskeletal system, unspecified

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

Applicable to

• Congenital anomaly of musculoskeletal system NOS
• Congenital deformity of musculoskeletal system NOS

Applies from Q79 Congenital malformations of musculoskeletal system, not elsewhere classified

Excludes2 (not included here)

• congenital (sternomastoid) torticollis (Q68.0)

MS-DRG index

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

Approximate ICD-9-CM (GEMs)

• 756.9 Other and unspecified anomalies of musculoskeletal system (approximate)

Code annotations containing back-references to Q79.9

Back-references to Q79

• 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 Q79.9

• Agenesis › bone
• Agenesis › cartilage
• Anomaly, anomalous (congenital) (unspecified type) › bone
• Anomaly, anomalous (congenital) (unspecified type) › bursa
• Anomaly, anomalous (congenital) (unspecified type) › fascia
• Anomaly, anomalous (congenital) (unspecified type) › ligament
• Anomaly, anomalous (congenital) (unspecified type) › muscle
• Anomaly, anomalous (congenital) (unspecified type) › musculoskeletal system, except limbs
• Anomaly, anomalous (congenital) (unspecified type) › tendon
• Deformity › bone (acquired) NOS › congenital
• Deformity › bursa, congenital
• Deformity › ligament (acquired) › congenital
• Deformity › muscle (acquired) › congenital
• Deformity › musculoskeletal system (acquired) › congenital
• Development › abnormal, bone
• Elongated, elongation (congenital) › bone
• Fusion, fused (congenital) › ossicles
• Hypoplasia, hypoplastic › bone NOS
• Malformation (congenital) › bone
• Malformation (congenital) › bursa
• Malformation (congenital) › musculoskeletal system
• Malformation (congenital) › tendon
• Rudimentary (congenital) › bone

Nearby codes

• Q79.61 Classical Ehlers-Danlos syndrome
• Q79.62 Hypermobile Ehlers-Danlos syndrome
• Q79.63 Vascular Ehlers-Danlos syndrome
• Q79.69 Other Ehlers-Danlos syndromes
• Q79.8 Other congenital malformations of musculoskeletal system
• Q79.9 Congenital malformation of musculoskeletal system, unspecified (this code)