Q07.9
Congenital malformation of nervous system, unspecified
Q07.9 (also written Q079) is a billable ICD-10-CM diagnosis code for congenital malformation of nervous system, unspecified. It is part of the FY2027 code set, effective October 1, 2026. It is one of the 6 codes in category Q07 (Other congenital malformations of nervous system). The Alphabetic Index lists it under 18 entries. Its coding notes include 4 Excludes2 entries.
Guidelines tip
From the FY2027 Official Guidelines. ICD10Ref adds no rules of its own.
Chapter 17 codes can be used for life. Manifestations that are an inherent part of a specifically coded anomaly are not coded separately. A corrected malformation is reported with a personal history code.
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
Also from chapter/block level (1 note)
- inborn errors of metabolism (E70-E88)
Inclusion terms
Conditions classified to this code.
- Congenital anomaly NOS of nervous system
- Congenital deformity NOS of nervous system
- Congenital disease or lesion NOS of nervous system
Notes
Also from chapter/block level (1 note)
- Codes from this chapter are not for use on maternal records
Alphabetic Index terms
Terms the official Alphabetic Index lists for this code. 18 entries
- Abnormal, abnormality, abnormalities, development, developmental, central nervous system
- Anomaly, anomalous (congenital) (unspecified type), gyri
- Anomaly, anomalous (congenital) (unspecified type), meningeal bands or folds
- Anomaly, anomalous (congenital) (unspecified type), meninges
- Anomaly, anomalous (congenital) (unspecified type), nerve
- Anomaly, anomalous (congenital) (unspecified type), nervous system (central)
- Deformity, meninges or membrane (congenital)
- Deformity, nervous system (congenital)
- Deformity, spinal, nerve root (congenital)
- Disease, diseased, nervous system, congenital
- Dysplasia, brain
- Encephalopathy (acute), congenital