ICD-10-CM Alphabetic Index · FY 2027 47 Entries
Seizure in the ICD-10-CM Index ICD-10-CM
The main term Seizure (s) carries 47 index entries pointing to 22 ICD-10-CM codes. The default entry is R56.9, the code the bare main term maps to; every indented line below refines the term by site, cause, or type. Verify any candidate code in the Tabular List before using it.
✓ Built from the official CMS FY 2027 index fileEffective Oct 1, 2026 – Sep 30, 2027
47
Index Entries
22
Codes Referenced
R56.9
Default Code
S
Letter
47 of 47 shown
ICD-10-CM
Index Entries Under Seizure 47 entries · 22 codes
Seizure (s) R56.9
absence G40.A Non-billable
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 Non-billable
intractable G40.A1 Non-billable
with status epilepticus G40.A11
without status epilepticus G40.A19
not intractable G40.A0 Non-billable
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
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Related Index Terms
Source: Centers for Medicare & Medicaid Services, FY 2027 ICD-10-CM Index to Diseases and Injuries release files, effective October 1, 2026 through September 30, 2027.
