R56.9 Unspecified convulsions
Billable ICD-10-CM code, FY2026.
Applicable to
- Convulsion disorder
- Fit NOS
- Recurrent convulsions
- Seizure(s) (convulsive) NOS
Applies from R56 Convulsions, not elsewhere classified
Excludes1 (never code together)
- dissociative convulsions and seizures (F44.5)
- epileptic convulsions and seizures (G40.-)
- newborn convulsions and seizures (P90)
Risk adjustment (HCC)
- CMS-HCC V28: HCC 201 — Seizure Disorders and Convulsions
- CMS-HCC V22: HCC 79 — Seizure Disorders and Convulsions
- ESRD V24: HCC 79
MS-DRG index
Defines the logic of DRG(s) 100-101 in MDC 01.
Approximate ICD-9-CM (GEMs)
780.39 Other convulsions (approximate)
Code annotations containing back-references to R56.9
Back-references to R56.9
- Code Also:
E20.810 Autosomal dominant hypocalcemia ("seizure disorder (G40.-, R56.9)") - Code Also:
G04.8 Other encephalitis, myelitis and encephalomyelitis ("any associated seizure (G40.-, R56.9)") - Type 1 Excludes:
G40 Epilepsy and recurrent seizures ("convulsions NOS (R56.9)") - Type 1 Excludes:
G40 Epilepsy and recurrent seizures ("seizure (convulsive) NOS (R56.9)") - Type 1 Excludes:
G40.89 Other seizures ("seizure NOS (R56.9)") - Code Also:
G43.1 Migraine with aura ("any associated seizure (G40.-, R56.9)") - Code Also:
G92.0 Immune effector cell-associated neurotoxicity syndrome ("unspecified convulsions (R56.9)") - Use Additional:
I16.1 Hypertensive emergency ("seizure (R56.9)")
Diagnosis Index entries for R56.9
- Convulsions (idiopathic)
- Convulsions (idiopathic) › recurrent
- Disorder (of) › paroxysmal, mixed
- Fit
- Seizure (s)
Nearby codes
R56 Convulsions, not elsewhere classifiedR56.0 Febrile convulsionsR56.00 Simple febrile convulsionsR56.01 Complex febrile convulsionsR56.1 Post traumatic seizuresR56.9 Unspecified convulsions (this code)