Narcolepsy in conditions classified elsewhere with cataplexy
Billable / specific
G47.421 is a billable, specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes in FY2027.
Excludes2
Not included here — may be reported together when both conditions exist.
- certain conditions originating in the perinatal period (P04-P96) (from G47)
- certain infectious and parasitic diseases (A00-B99) (from G47)
- complications of pregnancy, childbirth and the puerperium (O00-O9A) (from G47)
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99) (from G47)
- endocrine, nutritional and metabolic diseases (E00-E88) (from G47)
- injury, poisoning and certain other consequences of external causes (S00-T88) (from G47)
- neoplasms (C00-D49) (from G47)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94) (from G47)
- nightmares (F51.5) (from G47)
- nonorganic sleep disorders (F51.-) (from G47)
- sleep terrors (F51.4) (from G47)
- sleepwalking (F51.3) (from G47)
Code first
Sequence the underlying condition first.
- underlying condition (from G47.42)
Also known as
- Narcolepsy, in conditions classified elsewhere, with cataplexy
Parent code
- G47.42Narcolepsy in conditions classified elsewhereHeader
Related codes
- G47.429Narcolepsy in conditions classified elsewhere without cataplexyBillable