2019 ICD-10-CM Diagnosis Code G47.421

Narcolepsy in conditions classified elsewhere with cataplexy

ICD-10-CM Coding Rules
The following code(s) above G47.421 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to G47.421:
  • G00-G99
    2019 ICD-10-CM Range G00-G99

    Diseases of the nervous system

    Type 2 Excludes
    • 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)
    Diseases of the nervous system
  • G47
    ICD-10-CM Diagnosis Code G47

    Sleep disorders

      2016 2017 2018 2019 Non-Billable/Non-Specific Code
    Type 2 Excludes
    Sleep disorders
  • G47.42
    ICD-10-CM Diagnosis Code G47.42

    Narcolepsy in conditions classified elsewhere

      2016 2017 2018 2019 Non-Billable/Non-Specific Code
    Code First
    • underlying condition
    Narcolepsy in conditions classified elsewhere
Approximate Synonyms ICD-10-CM G47.421 is grouped within Diagnostic Related Group(s) (MS-DRG v36.0):

Convert G47.421 to ICD-9-CM

Code History

Diagnosis Index entries containing back-references to G47.421:

ICD-10-CM Codes Adjacent To G47.421
G47.34 Idiopathic sleep related nonobstructive alveolar hypoventilation
G47.35 Congenital central alveolar hypoventilation syndrome
G47.36 Sleep related hypoventilation in conditions classified elsewhere
G47.37 Central sleep apnea in conditions classified elsewhere
G47.39 Other sleep apnea
G47.4 Narcolepsy and cataplexy
G47.41 Narcolepsy
G47.411 …… with cataplexy
G47.419 …… without cataplexy
G47.42 Narcolepsy in conditions classified elsewhere
G47.421 …… with cataplexy
G47.429 …… without cataplexy
G47.5 Parasomnia
G47.50 …… unspecified
G47.51 Confusional arousals
G47.52 REM sleep behavior disorder
G47.53 Recurrent isolated sleep paralysis
G47.54 …… in conditions classified elsewhere
G47.59 Other parasomnia
G47.6 Sleep related movement disorders
G47.61 Periodic limb movement disorder

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.