ICD-10-CM › G00-G99 › G40-G47 › G40.84 KCNQ2-related epilepsy › G40.844
G40.844
KCNQ2-related epilepsy, intractable, without status epilepticus
ValidICD-10-CM diagnosis code.
Valid for claims with a date of service in the current code year.
What has happened to this code
Every change the publisher made, from 2025 to now.
- FY2025 Added to the code set KCNQ2-related epilepsy, intractable, without status epilepticus
Official coding rules
Published by CDC for FY2027. A rule attached to a category binds every code beneath it, so the rules inherited from this code's ancestors are shown with the code they come from.
Inherited from G40 Epilepsy and recurrent seizures
Excludes1 - never coded here
- 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
- hippocampal sclerosis (G93.81)
- mesial temporal sclerosis (G93.81)
- temporal sclerosis (G93.81)
- Todd's paralysis (G83.84)
Note
- the following terms are to be considered equivalent to intractable: pharmacoresistant (pharmacologically resistant), treatment resistant, refractory (medically) and poorly controlled
How CDC's index refers to this code
Wording from the official alphabetic index. Much of it appears nowhere in the code description, which is why a search for the everyday phrase so often finds nothing.
- Seizure
- Comatose
- Convulsive
- Paramnesia
- Convulsions
- Unconscious
- Loss > memory
- Pseudotetanus
- Lafora disease
- Fit > epileptic
- Coma > epileptic
- Lack of > memory
- Morbus > caducus
- Disorder > seizure
- Postsurgery status
- Seizure > disorder
- State > convulsive
- Stroke > epileptic
- Morbus > comitialis
- Seizure > epileptic
- Disturbance > memory
- Seizure > convulsive
- Syndrome > epileptic
- Disorder > convulsive
- Convulsions > epileptic
- Attack, attacks > epileptic
- Status > absence, epileptic
- Fugue > postictal in epilepsy
- Amnesia > postictal in epilepsy
- Disease, diseased > Lafora body
- Status > epileptic, epilepticus
- Memory disturbance, lack or loss
- Status > convulsivus idiopathicus
- Convulsions > infantile > epilepsy
- Dysrhythmia > cerebral or cortical
- Convulsions > epileptiform, epileptoid
- Symptoms NEC > involving > awareness > coma
- Symptoms NEC > involving > awareness > amnesia
- Symptoms NEC > involving > cognitive functions > coma
- Symptoms NEC > involving > cognitive functions > amnesia
Showing 40 of 42 index phrases.
Codes in the same group
| Code | Description | Status |
|---|---|---|
| G40.841 | KCNQ2-related epilepsy, not intractable, with status epilepticus | Valid |
| G40.842 | KCNQ2-related epilepsy, not intractable, without status epilepticus | Valid |
| G40.843 | KCNQ2-related epilepsy, intractable, with status epilepticus | Valid |