242 Codes and reporting guidelines for epilepsy using International Classification of Diseases, 10th Revision, Clinical Modification (ICD-10-CM) include familiar terminology carried over from International Classification of Diseases, Ninth Revision, Clinical Modification (ICD-9-CM). This article will review the similarities, differences, and documentation elements necessary for reporting epilepsy with ICD-10-CM. As with ICD-9-CM, ICD-10-CM codes for epilepsy include specification of the type of epilepsy and status of the condition (eg, whether or not the condition is intractable). Intractable is assigned when documentation includes such terms as treatment resistant, poorly controlled, pharmacoresistant, or refractory. In addition, ICD-10-CM codes specify epilepsy with or without status epilepticus. Example Refractory childhood absence epilepsy with status epilepticus is reported as follows using ICD-9-CM and ICD-10-CM: ICD-9-CM 345.01 Generalized nonconvulsive epilepsy, with intractable epilepsy ICD-10-CM G40.A11 Absence epileptic syndrome, intractable, with status epilepticus Note that ICD-9-CM code 345.01 does not specify status epilepticus. The differences in reporting epilepsy with or without status epilepticus may make it easier to code directly from the ICD-10-CM code set than crosswalking from ICD-9-CM. For instance, ICD- 9-CM code 345.2 is used to report petit mal seizure. The ICD-10-CM index reference for petit mal seizure refers to other generalized epilepsy and epileptic syndromes, category G40.4. Four code options are included in category G40.4. G40.401 Other generalized epilepsy and epileptic syndromes, not intractable, with status epilepticus G40.409 Other generalized epilepsy and epileptic syndromes, not intractable, without status epilepticus G40.411 Other generalized epilepsy and epileptic syndromes, intractable, with status epilepticus G40.419 Other generalized epilepsy and epileptic syndromes, intractable, without status epilepticus Appendix B-8 Epilepsy
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