G40.81
Lennox-Gastaut syndrome
G40.81 is a non-billable ICD-10-CM code header for lennox-Gastaut syndrome. Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. The more specific codes under it are G40.811 Lennox-Gastaut syndrome, not intractable, with status epilepticus; G40.812 Lennox-Gastaut syndrome, not intractable, without status epilepticus; G40.813 Lennox-Gastaut syndrome, intractable, with status epilepticus and G40.814 Lennox-Gastaut syndrome, intractable, without status epilepticus. Its coding notes include 5 Excludes1 entries and 12 Excludes2 entries.
Excludes1
Not coded here. The listed conditions generally should not be reported together.
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
Also from chapter/block level (8 notes)
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
Notes
- the following terms are to be considered equivalent to intractable: pharmacoresistant (pharmacologically resistant), treatment resistant, refractory (medically) and poorly controlled
More specific codes under G40.81 4
- G40.811Lennox-Gastaut syndrome, not intractable, with status epilepticusBillable
- G40.812Lennox-Gastaut syndrome, not intractable, without status epilepticusBillable
- G40.813Lennox-Gastaut syndrome, intractable, with status epilepticusBillable
- G40.814Lennox-Gastaut syndrome, intractable, without status epilepticusBillable