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ICD-10 Code G40.209: Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures, not intractable, without status epilepticus

G40.209 is a billable ICD-10 diagnosis code used to classify Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures, not intractable, without status epilepticus in medical records and claims. You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records. ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. This code sits within the broader ICD-10 area for Diseases of the nervous system (G00-G99).

What is this code?

ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. This code sits within the broader ICD-10 area for Diseases of the nervous system (G00-G99).

When is it used?

  • May be used when a clinician documents localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures, not intractable, without status epilepticus in a patient's medical record.
  • May appear in hospital records, claims, referrals, and clinical documentation.
  • This code can be used as a clinically usable diagnosis entry in standardized coding workflows.

What it does not mean

  • A code alone does not explain severity, treatment plan, or outcome.
  • A medical code should not be treated as a substitute for a doctor's diagnosis or advice.

Code hierarchy

chapter
6Diseases of the nervous system (G00-G99)
block
G40-G47Episodic and paroxysmal disorders
category
G40Epilepsy and recurrent seizures
category
G40.2Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures
category
G40.20Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures, not intractable
currentG40.20

Official coding notes

Inclusion terms
  • Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures NOS

Where you may see this code

You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records.

Related specialists

NeurologistGeneral Physician

Coverage-related procedures and services

CPT 0349Uhigh
DRUG METABOLISM OR PROCESSING (MULTIPLE CONDITIONS), WHOLE BLOOD OR BUCCAL SPECIMEN, DNA ANALYSIS, 27 GENE REPORT, WITH VARIANT ANALYSIS, INCLUDING REPORTED PHENOTYPES AND IMPACTED GENE-DRUG INTERACTIONS
Source: CMS coverage guidance
CPT 0423Uhigh
PSYCHIATRY (EG, DEPRESSION, ANXIETY), GENOMIC ANALYSIS PANEL, INCLUDING VARIANT ANALYSIS OF 26 GENES, BUCCAL SWAB, REPORT INCLUDING METABOLIZER STATUS AND RISK OF DRUG TOXICITY BY CONDITION
Source: CMS coverage guidance
CPT 81225high
CYP2C19 (CYTOCHROME P450, FAMILY 2, SUBFAMILY C, POLYPEPTIDE 19) (EG, DRUG METABOLISM), GENE ANALYSIS, COMMON VARIANTS (EG, *2, *3, *4, *8, *17)
Source: CMS coverage guidance
CPT 81227high
CYP2C9 (CYTOCHROME P450, FAMILY 2, SUBFAMILY C, POLYPEPTIDE 9) (EG, DRUG METABOLISM), GENE ANALYSIS, COMMON VARIANTS (EG, *2, *3, *5, *6)
Source: CMS coverage guidance
CPT 0434Uhigh
DRUG METABOLISM (ADVERSE DRUG REACTIONS AND DRUG RESPONSE), GENOMIC ANALYSIS PANEL, VARIANT ANALYSIS OF 25 GENES WITH REPORTED PHENOTYPES
Source: CMS coverage guidance
CPT 81418high
DRUG METABOLISM (EG, PHARMACOGENOMICS) GENOMIC SEQUENCE ANALYSIS PANEL, MUST INCLUDE TESTING OF AT LEAST 6 GENES, INCLUDING CYP2C19, CYP2D6, AND CYP2D6 DUPLICATION/DELETION ANALYSIS
Source: CMS coverage guidance

Coding guidelines

Common synonyms

Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures, not intractable, without status epilepticusLocalization-relatedLocalization-related focal partial symptomatic epilepsy and epileptic syndromes with complex partial seizures, not intractable, without status epilepticus

Frequently asked questions

Code details

CodeG40.209
SystemICD10
Display nameLocalization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures, not intractable, without status epilepticus
ChapterDiseases of the nervous system (G00-G99)
BlockEpisodic and paroxysmal disorders

Flags

BillableYes
Valid clinical useYes

Source

SourceICD-10
Version2026-annual
Releaseannual
Year2026

Index terms

Matched terms
Epilepsy, epileptic, epilepsia(attack) (cerebral) (convulsion) (fit) (seizure)Epilepsy, epileptic, epilepsia(attack) (cerebral) (convulsion) (fit) (seizure)Epilepsy, epileptic, epilepsia(attack) (cerebral) (convulsion) (fit) (seizure)Epilepsy, epileptic, epilepsia(attack) (cerebral) (convulsion) (fit) (seizure)Epilepsy, epileptic, epilepsia(attack) (cerebral) (convulsion) (fit) (seizure)Epilepsy, epileptic, epilepsia(attack) (cerebral) (convulsion) (fit) (seizure)

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.