Skip to main content
ICD-10/G40.B09

G40.B09 ICD-10-CM Code: Juvenile myoclonic epilepsy, not intractable, without status epilepticus

Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.

Inpatient Payment Groups (MS-DRG)

MS-DRGs this diagnosis helps define, as principal or secondary, per the CMS ICD-10-CM/PCS MS-DRG Definitions Manual v43.0, Appendix B.

  • MS-DRG 023 — CRANIOTOMY WITH MAJOR DEVICE IMPLANT OR ACUTE COMPLEX CNS PRINCIPAL DIAGNOSIS WITH MCC OR ANTINEOPLASTIC IMPLANT OR EPILEPSY WITH NEUROSTIMULATOR (MDC 01)
  • MS-DRG 100 — SEIZURES WITH MCC (MDC 01)
  • MS-DRG 101 — SEIZURES WITHOUT MCC (MDC 01)

A diagnosis appearing in a group's logic does not by itself determine the DRG assigned to a stay; the grouper uses the full claim.

Risk Adjustment (CMS-HCC)

Payment categories this diagnosis maps to under CMS-HCC V28, payment year 2026.

  • HCC 201 — Seizure Disorders and Convulsions

Other models: CMS-HCC V22 HCC 79 · RxHCC V08 HCC 164

Risk scores depend on the enrollee's full accepted diagnosis set and segment; a category mapping alone does not determine payment.

Official Registry Overview & Definition

Juvenile myoclonic epilepsy, not intractable, without status epilepticus is a billable ICD-10-CM diagnosis code (G40.B09).

Official Tabular Instructional Notes

Sequencing, inclusion, and exclusion notes published for G40.B09 in the official ICD-10-CM tabular list.

Excludes1 — Not Coded Here

Conditions generally not reported together with this code (Excludes1) -- an error unless the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).

Excludes2 — Not Included Here

Conditions not covered by this code, but which may be reported alongside it when both are present.

Change history

No changes recorded for this code — unchanged since the FY2016 baseline of the change ledger.

Verify Before Coding

  • Billable — reportable as written.
  • CC as a secondary diagnosis (FY2026). Can raise the stay's MS-DRG severity tier.

From the code registry, the Medicare Code Editor, and the MS-DRG Definitions Manual. Check it against a full claim.

Contextual Map

Every relationship of G40.B09 in one view: hierarchy, official tabular instructions in both directions, clinical classification, risk adjustment, MS-DRG participation, index terms and change history — each edge carrying the CMS source it derives from.

Hierarchy

  • G40.B0 — Juvenile myoclonic epilepsy, not intractable [Hierarchy]

Referenced by Excludes1 notes

  • G25.3 — Myoclonus [Excludes1](via G40.-): “myoclonic epilepsy (G40.-)”
  • R56 — Convulsions, not elsewhere classified [Excludes1](via G40.-): “epileptic convulsions and seizures (G40.-)”
  • R56.1 — Post traumatic seizures [Excludes1](via G40.-): “post traumatic epilepsy (G40.-)”

Referenced by Excludes2 notes

  • F44.0 — Dissociative amnesia [Excludes2](via G40.-): “postictal amnesia in epilepsy (G40.-)”
  • F44.1 — Dissociative fugue [Excludes2](via G40.-): “postictal fugue in epilepsy (G40.-)”

Referenced by Code First instructions

  • F02 — Dementia in other diseases classified elsewhere [Code First](via G40.-): “epilepsy and recurrent seizures (G40.-)”

Referenced by Use Additional Code instructions

  • Q87.87 — Hao-Fountain Syndrome [Use Additional Code](via G40.-): “epilepsy, by specific type (G40.-)”
  • Q93.52 — Phelan-McDermid syndrome [Use Additional Code](via G40.-): “epilepsy and recurrent seizures (G40.-)”

Referenced by Code Also instructions (9)

  • E20.810 — Autosomal dominant hypocalcemia [Code Also](via G40.-): “seizure disorder (G40.-, R56.9)”
  • F78.A1 — SYNGAP1-related intellectual disability [Code Also](via G40.-): “epilepsy and recurrent seizures (G40.-)”
  • G04.8 — Other encephalitis, myelitis and encephalomyelitis [Code Also](via G40.-): “any associated seizure (G40.-, R56.9)”
  • G43.1 — Migraine with aura [Code Also](via G40.-): “any associated seizure (G40.-, R56.9)”
  • G93.45 — Developmental and epileptic encephalopathy [Code Also](via G40.-): “epilepsy, by specific type (G40.-)”
  • I67.850 — Cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy [Code Also](via G40.-): “epilepsy (G40.-)”
  • Q87.85 — MED13L syndrome [Code Also](via G40.-): “epilepsy and recurrent seizures (G40.-)”
  • QA0 — Neurodevelopmental disorders related to specific genetic pathogenic variants [Code Also](via G40.-): “epilepsy, by specific type (G40.-)”
  • and 1 more

Clinical classification (CCSR)

  • NVS009 — Epilepsy; convulsions [CCSR]

Risk adjustment (CMS-HCC)

  • HCC 201 — Seizure Disorders and Convulsions [CMS-HCC]

Potential MS-DRG

  • CC — Complication or Comorbidity [MS-DRG severity]: “As a secondary diagnosis this code can raise the stay's MS-DRG severity tier (CC).”
  • DRG 023 — CRANIOTOMY WITH MAJOR DEVICE IMPLANT OR ACUTE COMPLEX CNS PRINCIPAL DIAGNOSIS WITH MCC OR ANTINEOPLASTIC IMPLANT OR EPILEPSY WITH NEUROSTIMULATOR [MS-DRG]: “CRANIOTOMY WITH MAJOR DEVICE IMPLANT OR ACUTE COMPLEX CNS PRINCIPAL DIAGNOSIS WITH MCC OR ANTINEOPLASTIC IMPLANT OR EPILEPSY WITH NEUROSTIMULATOR (MDC 01)”
  • DRG 100 — SEIZURES WITH MCC [MS-DRG]: “SEIZURES WITH MCC (MDC 01)”
  • DRG 101 — SEIZURES WITHOUT MCC [MS-DRG]: “SEIZURES WITHOUT MCC (MDC 01)”

Index entries

  • Epilepsy, epileptic, epilep… — Epilepsy, epileptic, epilepsia (attack) (cerebral) (convulsion) (fit) (seizure), juvenile myoclonic [Index term]
  • Epilepsy, epileptic, epilep… — Epilepsy, epileptic, epilepsia (attack) (cerebral) (convulsion) (fit) (seizure), juvenile myoclonic, not intractable [Index term]
  • Epilepsy, epileptic, epilep… — Epilepsy, epileptic, epilepsia (attack) (cerebral) (convulsion) (fit) (seizure), juvenile myoclonic, not intractable, without status epilepticus [Index term]

Nearest codes (40)

  • G40 — Epilepsy and recurrent seizures [Sibling]
  • G40.821 — Epileptic spasms, not intractable, with status epilepticus [Sibling]
  • G40.822 — Epileptic spasms, not intractable, without status epilepticus [Sibling]
  • G40.823 — Epileptic spasms, intractable, with status epilepticus [Sibling]
  • G40.824 — Epileptic spasms, intractable, without status epilepticus [Sibling]
  • G40.83 — Dravet syndrome [Sibling]
  • G40.833 — Dravet syndrome, intractable, with status epilepticus [Sibling]
  • G40.834 — Dravet syndrome, intractable, without status epilepticus [Sibling]
  • and 32 more

Referenced by Other Codes

Clinical classification (AHRQ CCSR):NVS009 — Epilepsy; convulsions (default).

Clinical Classifications Software Refined (CCSR) for ICD-10-CM Diagnoses. Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality.

Potential MS-DRG Relationships (FY2026)

CC — Complication or Comorbidity. Reported as a secondary diagnosis, this code raises the stay's MS-DRG severity tier — except when the principal diagnosis is one of 89 clinically related codes on its CMS exclusion list.

Named in the grouper logic of 3 MS-DRGs: DRG 023 (MDC 01), DRG 100 (MDC 01), DRG 101 (MDC 01).

From the CMS MS-DRG Definitions Manual (Appendices B and C). Actual DRG assignment depends on the complete claim.

Official ICD-10-CM tabular notes on other codes that name G40.B09 or its code family.

3 Excludes1 notes across 2 chapters: G25.3 (via G40.-), R56 (via G40.-), R56.1 (via G40.-).

2 Excludes2 notes: F44.0 (via G40.-), F44.1 (via G40.-).

1 Code First instructions: F02 (via G40.-).

2 Use Additional Code instructions: Q87.87 (via G40.-), Q93.52 (via G40.-).

9 Code Also instructions across 7 chapters: E20.810 (via G40.-), F78.A1 (via G40.-), G04.8 (via G40.-), G43.1 (via G40.-), G93.45 (via G40.-), I67.850 (via G40.-), Q87.85 (via G40.-), QA0 (via G40.-), Z15.1 (via G40.-).

Nearest Codes in This Family

Official ICD-10-CM classifications closest to G40.B09 in its code family, with their registry titles.

  • G40.A11 — Absence epileptic syndrome, intractable, with status epilepticus
  • G40.A19 — Absence epileptic syndrome, intractable, without status epilepticus
  • G40.B — Juvenile myoclonic epilepsy [impulsive petit mal]
  • G40.B0 — Juvenile myoclonic epilepsy, not intractable
  • G40.B01 — Juvenile myoclonic epilepsy, not intractable, with status epilepticus
  • G40.B1 — Juvenile myoclonic epilepsy, intractable
  • G40.B11 — Juvenile myoclonic epilepsy, intractable, with status epilepticus
  • G40.B19 — Juvenile myoclonic epilepsy, intractable, without status epilepticus
  • G40.C — Lafora progressive myoclonus epilepsy
  • G40.C0 — Lafora progressive myoclonus epilepsy, not intractable

View all codes in the G40 family

Indexed Clinical Terms (3)

Clinical term phrases from the official ICD-10-CM Index to Diseases and Injuries that map to this code.

  • Epilepsy, epileptic, epilepsia (attack) (cerebral) (convulsion) (fit) (seizure), juvenile myoclonic
  • Epilepsy, epileptic, epilepsia (attack) (cerebral) (convulsion) (fit) (seizure), juvenile myoclonic, not intractable
  • Epilepsy, epileptic, epilepsia (attack) (cerebral) (convulsion) (fit) (seizure), juvenile myoclonic, not intractable, without status epilepticus