R56.1Post traumatic seizures

R56.1 is the ICD-10-CM diagnosis code for post traumatic seizures. It belongs to category R56 (convulsions, not elsewhere classified), block R50-R69 (general symptoms and signs) and chapter 18 (symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within R56 (convulsions, not elsewhere classified), R56.1 is specifically for post traumatic seizures. Related codes cover febrile convulsions (R56.0) and unspecified convulsions (R56.9).

Don't report R56.1 together with the conditions in its Excludes1 note: post traumatic epilepsy (G40.-).

As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.

In MS-DRG v44.0, it is part of the grouping logic for DRG 100 (Seizures with MCC, relative weight 1.9233) and DRG 101 (Seizures without MCC, relative weight 0.8952), in MDC 01 (Diseases and Disorders of the Nervous System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 780.33 (post traumatic seizures).