ICD-10-CM 2027
ICD-10 code for Pyknolepsy
From the official ICD-10-CM alphabetic index entry “Pyknolepsy”. Page updated September 29, 2026.
About coding Pyknolepsy
The ICD-10-CM code for Pyknolepsy is G40.A09 (Absence epileptic syndrome, not intractable, without status epilepticus). The official index lists 6 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on G40.A09.
Within G40.A0, choose G40.A09 (without status epilepticus) only when documentation doesn't support a more specific option: with status epilepticus (G40.A01).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 023 (Craniotomy with Major Device Implant or Acute Complex CNS Principal Diagnosis with MCC or Antineoplastic Implant or Epilepsy with Neurostimulator, relative weight 5.7444), DRG 100 (Seizures with MCC, relative weight 1.9233) and DRG 101 (Seizures without MCC, relative weight 0.8952), in MDC 01 (Diseases and Disorders of the Nervous System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
More specific Pyknolepsy codes (official index)
- intractable G40.A19 — Absence epileptic syndrome, intractable, without status epilepticus
- with status epilepticus G40.A11 — Absence epileptic syndrome, intractable, with status epilepticus
- without status epilepticus G40.A19 — Absence epileptic syndrome, intractable, without status epilepticus
- not intractable G40.A09 — Absence epileptic syndrome, not intractable, without status epilepticus
- with status epilepticus G40.A01 — Absence epileptic syndrome, not intractable, with status epilepticus
- without status epilepticus G40.A09 — Absence epileptic syndrome, not intractable, without status epilepticus
Common questions about Pyknolepsy ICD-10 codes
What is the ICD-10 code for Pyknolepsy?
- G40.A09 — Absence epileptic syndrome, not intractable, without status epilepticus. More specific codes apply when the documentation supports them: G40.A19, G40.A11, G40.A19, G40.A09 and others below.
What is the ICD-10 code for intractable pyknolepsy?
- G40.A19 — Absence epileptic syndrome, intractable, without status epilepticus.
Is G40.A09 billable?
- Yes. G40.A09 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can G40.A09 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict G40.A09 as a principal diagnosis.
Is G40.A09 a CC or MCC?
- No. G40.A09 is neither a CC nor an MCC under MS-DRG v44.0.