Billable / Specific Code
ICD-10-CM G40.842 is the diagnosis code for KCNQ2-related epilepsy, not intractable, without status epilepticus. This code falls under the section "Episodic and paroxysmal disorders" within Chapter 6 — Diseases of the nervous system (G00-G99). It is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. Medical coders and healthcare providers use this code to document and classify diagnoses in electronic health records, insurance claims, and clinical databases.
Understanding where G40.842 sits in the ICD-10-CM classification helps ensure proper coding:
Yes, G40.842 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
G40.842 is the ICD-10-CM diagnosis code for "KCNQ2-related epilepsy, not intractable, without status epilepticus". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of G40.842 is G40.84 ("KCNQ2-related epilepsy"). G40.842 provides a more specific classification within this category.
G40.842 is located in Section G40-G47 — "Episodic and paroxysmal disorders" within Chapter 6 of the ICD-10-CM Tabular List.
Use G40.842 when the patients documented diagnosis matches "KCNQ2-related epilepsy, not intractable, without status epilepticus" and the clinical documentation supports this level of specificity. Always verify with the latest ICD-10-CM guidelines and payer requirements.
The ICD-10-CM code for KCNQ2-related epilepsy, not intractable, without status epilepticus is G40.842.
Yes, G40.842 can be used as a primary diagnosis code since it is billable and specific.
G40.842 is in Chapter 6 of the ICD-10-CM Tabular List.
Yes, G40.842 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.