All ICD10 Codes
G40Not billable, use a more specific code below

Epilepsy and recurrent seizures

In Episodic and paroxysmal disorders (G40-G47), chapter 6: Diseases of the Nervous System

58 billable codes under G40: 3 are an MCC, 47 are a CC; all map to HCC 201 (Seizure Disorders and Convulsions).A CC or MCC (major CC) is a secondary diagnosis that raises the MS-DRG payment. An HCC counts toward a Medicare Advantage patient's risk score.

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Instructional notes

Excludes1: not coded here, use a different code

  • conversion disorder with seizures (F44.5)
  • convulsions NOS (R56.9)
  • post traumatic seizures (R56.1)
  • seizure (convulsive) NOS (R56.9)
  • seizure of newborn (P90)

Excludes2: not included here, code separately if applicable

Official coding guidelines

From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.

Covers default dominant or nondominant side for hemiplegia and monoplegia, and use and sequencing of G89 pain codes, including postoperative, chronic, and neoplasm-related pain.

Read Section I.C.6 (page 45)

All codes under G40

G40 can't be used on a claim. Pick a billable code below; grey headings group them.

G40 MS-DRGs

As the principal diagnosis, all 58 billable codes under G40 group to MS-DRG 023, 100, or 101 (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.

Other codes that refer to G40

Notes on these codes point to G40.

  • E20.810 Code Also: seizure disorder (G40.-, R56.9)
  • F02 Code First: epilepsy and recurrent seizures (G40.-)
  • F44.0 Excludes2: postictal amnesia in epilepsy (G40.-)
  • F44.1 Excludes2: postictal fugue in epilepsy (G40.-)
  • F78.A1 Code Also: epilepsy and recurrent seizures (G40.-)
  • G04.8 Code Also: any associated seizure (G40.-, R56.9)
  • G25.3 Excludes1: myoclonic epilepsy (G40.-)
  • G40.5 Code Also: if applicable, associated epilepsy and recurrent seizures (G40.-)
  • G43.1 Code Also: any associated seizure (G40.-, R56.9)
  • G93.45 Code Also: epilepsy, by specific type (G40.-)
  • I67.850 Code Also: epilepsy (G40.-)
  • Q87.85 Code Also: epilepsy and recurrent seizures (G40.-)
  • Q87.87 Use Additional Code: epilepsy, by specific type (G40.-)
  • Q93.52 Use Additional Code: epilepsy and recurrent seizures (G40.-)
  • QA0 Code Also: epilepsy, by specific type (G40.-)
  • R56 Excludes1: epileptic convulsions and seizures (G40.-)
  • R56.1 Excludes1: post traumatic epilepsy (G40.-)
  • Z15.1 Code Also: epilepsy, by specific type (G40.-)

About the condition

Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.

Epilepsy

Epilepsy is a brain disorder that causes people to have recurring seizures. The seizures happen when clusters of nerve cells, or neurons, in the brain send out the wrong signals. People may have strange sensations and emotions or behave strangely. They may have violent muscle spasms or lose consciousness.

Read more about epilepsy on MedlinePlus

Code history

Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.