G40.91 ICD-10-CM Code: Epilepsy, unspecified, intractable
Billing Status: NO. This is a clinician non-billable / parent hierarchy grouping in the ICD-10-CM system.
Code Set: Valid FY2026 and FY2027. FY2026 took effect October 1, 2025.
Official Registry Overview & Definition
Official Tabular Instructional Notes
Sequencing, inclusion, and exclusion notes published for G40.91 in the official ICD-10-CM tabular list.
Inclusion Terms
Alternative terms the tabular list files under this code.
- Intractable seizure disorder NOS
Excludes1 — Not Coded Here
Conditions that can never be reported with this code; the two are mutually exclusive.
- conversion disorder with seizures (F44.5)
- convulsions NOS (R56.9)
- post traumatic seizures (R56.1)
- seizure (convulsive) NOS (R56.9)
- seizure of newborn (P90)
Excludes2 — Not Included Here
Conditions not covered by this code, but which may be reported alongside it when both are present.
- hippocampal sclerosis (G93.81)
- mesial temporal sclerosis (G93.81)
- temporal sclerosis (G93.81)
- Todd's paralysis (G83.84)
Frequently Asked Questions (FAQ) & Clinical Guidance
Can G40.91 be billed directly?
No. G40.91 (Epilepsy, unspecified, intractable) is a non-billable ICD-10-CM category code. A more specific billable subcode must be selected based on clinical documentation.
Nearest Codes in This Family
Official ICD-10-CM classifications closest to G40.91 in its code family, with their registry titles.
- G40.89 — Other seizures
- G40.9 — Epilepsy, unspecified
- G40.90 — Epilepsy, unspecified, not intractable
- G40.901 — Epilepsy, unspecified, not intractable, with status epilepticus
- G40.909 — Epilepsy, unspecified, not intractable, without status epilepticus
- G40.911 — Epilepsy, unspecified, intractable, with status epilepticus
- G40.919 — Epilepsy, unspecified, intractable, without status epilepticus
- G40.A — Absence epileptic syndrome
- G40.A0 — Absence epileptic syndrome, not intractable
- G40.A01 — Absence epileptic syndrome, not intractable, with status epilepticus