G40.A09
Absence epileptic syndrome, not intractable, without status epilepticus
G40.A09 (also written G40A09) is a billable ICD-10-CM diagnosis code for absence epileptic syndrome, not intractable, without status epilepticus. It is part of the FY2027 code set, effective October 1, 2026. It is one of the 58 codes in category G40 (Epilepsy and recurrent seizures). The Alphabetic Index lists it under 13 entries. Its coding notes include 5 Excludes1 entries and 12 Excludes2 entries.
Excludes1
Not coded here. The listed conditions generally should not be reported together.
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
Also from chapter/block level (8 notes)
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
Care settings
How CMS programs treat this code. These are CMS claim edits and list entries, not coverage or eligibility rules.
Home Health Primary
Accepted as the primary (principal) diagnosis on a home health claim. The Home Health Grouper assigns it to the MMTA - Other clinical group.
Source: CMS Home Health Grouper Software v07.2.26, effective October 1, 2026Notes
- the following terms are to be considered equivalent to intractable: pharmacoresistant (pharmacologically resistant), treatment resistant, refractory (medically) and poorly controlled
Alphabetic Index terms
Terms the official Alphabetic Index lists for this code. 13 entries
- Epilepsy, epileptic, epilepsia (attack) (cerebral) (convulsion) (fit) (seizure), childhood, absence
- Epilepsy, epileptic, epilepsia (attack) (cerebral) (convulsion) (fit) (seizure), childhood, absence, not intractable
- Epilepsy, epileptic, epilepsia (attack) (cerebral) (convulsion) (fit) (seizure), childhood, absence, not intractable, without status epilepticus
- Epilepsy, epileptic, epilepsia (attack) (cerebral) (convulsion) (fit) (seizure), juvenile absence
- Epilepsy, epileptic, epilepsia (attack) (cerebral) (convulsion) (fit) (seizure), juvenile absence, not intractable
- Epilepsy, epileptic, epilepsia (attack) (cerebral) (convulsion) (fit) (seizure), juvenile absence, not intractable, without status epilepticus
- Pyknolepsy
- Pyknolepsy, not intractable
- Pyknolepsy, not intractable, without status epilepticus
- Seizure (s), petit mal, not intractable, without status epilepticus
- Syndrome, epileptic, absence
- Syndrome, epileptic, absence, not intractable