G40.842
✓ BillableKCNQ2-related epilepsy, not intractable, without status epilepticus
Diseases of the nervous system (G00-G99)
Also Known As
❌ Excludes1
inheritedRules inherited from parent codes in the hierarchy.
- • 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
inheritedRules inherited from parent codes.
- • hippocampal sclerosis (G93.81)
- • mesial temporal sclerosis (G93.81)
- • temporal sclerosis (G93.81)
- • Todd's paralysis (G83.84)
Clinical Description
ICD-10-CM code G40.842 represents kcnq2-related epilepsy, not intractable, without status epilepticus. This code falls under the Diseases of the nervous system (G00-G99) classification. It is a billable/specific code valid for HIPAA-covered transactions as of October 1, 2025 (FY2026). This code can be used to indicate a diagnosis for reimbursement purposes on insurance claims.
This is a 7-character code at the 6th level of specificity. This is the most specific code available in this subcategory. Coders should note that G40.842 has 5 Excludes1 restriction(s) — codes that cannot be reported together on the same claim.
Frequently Asked Questions
What is ICD-10 code G40.842?
ICD-10-CM code G40.842 is "KCNQ2-related epilepsy, not intractable, without status epilepticus". It belongs to the category: Diseases of the nervous system (G00-G99).
Is G40.842 a billable ICD-10 code?
Yes, G40.842 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
What codes are excluded with G40.842?
G40.842 has 5 Excludes1 rule(s). These codes are mutually exclusive and cannot be coded together on the same claim.
Can G40.842 be coded with other codes?
G40.842 has 4 Excludes2 note(s). These conditions can be coded together if both are documented in the patient record.
Related Codes in G40.84
Other codes in the same category that may be relevant for differential coding:
🧪 Validate Combinations
Add G40.842 to the Excludes Checker to validate against your full code list.
Open in Checker →Code Information
Data Source
CMS ICD-10-CM 2026 Tabular List
Updated October 1, 2025 (FY2026)