ICD-10 Code for Seizure

The default ICD-10-CM 2027 code for seizure (s) is R56.9 – Unspecified convulsions. More specific codes depend on the details documented, as listed in the official index (22 codes, 19 billable).

Main code: R56.9 – Unspecified convulsions
Billable: Yes
See also: Convulsions

Index entries for Seizure

absence – G40.A- (header)
akinetic – see Epilepsy, generalized, specified NEC
atonic – see Epilepsy, generalized, specified NEC
autonomic (hysterical) – F44.5
convulsive – see Convulsions
cortical (focal) (motor) – see Epilepsy, localization-related, symptomatic, with simple partial seizures
disorder – G40.909 – see also Epilepsy
due to stroke – see Sequelae (of), disease, cerebrovascular, by type, specified NEC
epileptic – see Epilepsy
febrile (simple) – R56.00
- with status epilepticus – G40.901
- complex (atypical) (complicated) – R56.01
  - with status epilepticus – G40.901
grand mal – G40.409
- intractable – G40.419
  - with status epilepticus – G40.411
  - without status epilepticus – G40.419
- not intractable – G40.409
  - with status epilepticus – G40.401
  - without status epilepticus – G40.409
heart – see Disease, heart
hysterical – F44.5
intractable – G40.919
- with status epilepticus – G40.911
Jacksonian (focal) (motor type) (sensory type) – see Epilepsy, localization-related, symptomatic, with simple partial seizures
newborn – P90
nonspecific epileptic
- atonic – see Epilepsy, generalized, specified NEC
- clonic – see Epilepsy, generalized, specified NEC
- myoclonic – see Epilepsy, generalized, specified NEC
- tonic – see Epilepsy, generalized, specified NEC
- tonic-clonic – see Epilepsy, generalized, specified NEC
partial, developing into secondarily generalized seizures
- complex – see Epilepsy, localization-related, symptomatic, with complex partial seizures
- simple – see Epilepsy, localization-related, symptomatic, with simple partial seizures
petit mal – G40.A- (header)
- intractable – G40.A1- (header)
  - with status epilepticus – G40.A11
  - without status epilepticus – G40.A19
- not intractable – G40.A0- (header)
  - with status epilepticus – G40.A01
  - without status epilepticus – G40.A09
post traumatic – R56.1
recurrent – G40.909
specified NEC – G40.89
uncinate – see Epilepsy, localization-related, symptomatic, with complex partial seizures

How to choose the right code

Start with the main term, then pick the indented subterm that matches the documentation (type, cause, site, laterality, episode of care). Always confirm the code in the tabular list: follow its Excludes1/Excludes2, “code first” and “use additional code” notes, and add a 7th character where required.

Source: CDC/NCHS ICD-10-CM FY2027 alphabetic index.