2021

  1. ICD-10-CM Codes
    2. ›
  2. R00-R99 Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified
    3. ›
  3. R50-R69 General symptoms and signs
    4. ›
  4. R56- Convulsions, not elsewhere classified
    5. ›
  5. 2021 ICD-10-CM Diagnosis Code R56.9

2021 ICD-10-CM Diagnosis Code R56.9

Unspecified convulsions

    2016 2017 2018 2019 2020 2021 Billable/Specific Code
  • R56.9 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2021 edition of ICD-10-CM R56.9 became effective on October 1, 2020.
  • This is the American ICD-10-CM version of R56.9 - other international versions of ICD-10 R56.9 may differ.
Applicable To
  • Convulsion disorder
  • Fit NOS
  • Recurrent convulsions
  • Seizure(s) (convulsive) NOS
The following code(s) above R56.9 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 R56.9:
  • R00-R99
    2021 ICD-10-CM Range R00-R99

    Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified

    Note
    • This chapter includes symptoms, signs, abnormal results of clinical or other investigative procedures, and ill-defined conditions regarding which no diagnosis classifiable elsewhere is recorded.
    • Signs and symptoms that point rather definitely to a given diagnosis have been assigned to a category in other chapters of the classification. In general, categories in this chapter include the less well-defined conditions and symptoms that, without the necessary study of the case to establish a final diagnosis, point perhaps equally to two or more diseases or to two or more systems of the body. Practically all categories in the chapter could be designated 'not otherwise specified', 'unknown etiology' or 'transient'. The Alphabetical Index should be consulted to determine which symptoms and signs are to be allocated here and which to other chapters. The residual subcategories, numbered .8, are generally provided for other relevant symptoms that cannot be allocated elsewhere in the classification.
    • The conditions and signs or symptoms included in categories R00-R94 consist of:
    • (a) cases for which no more specific diagnosis can be made even after all the facts bearing on the case have been investigated;
    • (b) signs or symptoms existing at the time of initial encounter that proved to be transient and whose causes could not be determined;
    • (c) provisional diagnosis in a patient who failed to return for further investigation or care;
    • (d) cases referred elsewhere for investigation or treatment before the diagnosis was made;
    • (e) cases in which a more precise diagnosis was not available for any other reason;
    • (f) certain symptoms, for which supplementary information is provided, that represent important problems in medical care in their own right.
    Type 2 Excludes
    • abnormal findings on antenatal screening of mother (O28.-)
    • certain conditions originating in the perinatal period (P04-P96)
    • signs and symptoms classified in the body system chapters
    • signs and symptoms of breast (N63, N64.5)
    Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified
  • R56
    ICD-10-CM Diagnosis Code R56

    Convulsions, not elsewhere classified

      2016 2017 2018 2019 2020 2021 Non-Billable/Non-Specific Code
    Type 1 Excludes
    • dissociative convulsions and seizures (F44.5)
    • epileptic convulsions and seizures (G40.-)
    • newborn convulsions and seizures (P90)
    Convulsions, not elsewhere classified
Approximate Synonyms
  • Generalized seizure
  • Nonspecific paroxysmal spell
  • Seizure
  • Seizure as late effect of stroke
  • Seizure disorder
  • Seizure disorder as sequela of stroke
  • Seizure with provoking factor
  • Seizure, generalized
  • Seizure, single
  • Seizures in response to acute event
Clinical Information
  • The most dramatic type of seizure
  • The most dramatic type of seizure, characterized by tonic and clonic contraction of most skeletal muscles.
ICD-10-CM R56.9 is grouped within Diagnostic Related Group(s) (MS-DRG v38.0):
  • 100 Seizures with mcc
  • 101 Seizures without mcc
  • 791 Prematurity with major problems
  • 793 Full term neonate with major problems

Convert R56.9 to ICD-9-CM

Code History
  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change
  • 2020 (effective 10/1/2019): No change
  • 2021 (effective 10/1/2020): No change
Code annotations containing back-references to R56.9:
  • Code Also: G04.8
    , G43.1
    ICD-10-CM Diagnosis Code G04.8

    Other encephalitis, myelitis and encephalomyelitis

      2016 2017 2018 2019 2020 2021 Non-Billable/Non-Specific Code
    Code Also
    ICD-10-CM Diagnosis Code G43.1

    Migraine with aura

      2016 2017 2018 2019 2020 2021 Non-Billable/Non-Specific Code
    Applicable To
    • Basilar migraine
    • Classical migraine
    • Migraine equivalents
    • Migraine preceded or accompanied by transient focal neurological phenomena
    • Migraine triggered seizures
    • Migraine with acute-onset aura
    • Migraine with aura without headache (migraine equivalents)
    • Migraine with prolonged aura
    • Migraine with typical aura
    • Retinal migraine
    Code Also
    Type 1 Excludes
  • Type 1 Excludes: G40
    , G40
    , G40.89
    ICD-10-CM Diagnosis Code G40

    Epilepsy and recurrent seizures

      2016 2017 2018 2019 2020 2021 Non-Billable/Non-Specific Code
    Note
    • the following terms are to be considered equivalent to intractable: pharmacoresistant (pharmacologically resistant), treatment resistant, refractory (medically) and poorly controlled
    Type 1 Excludes
    • conversion disorder with seizures (F44.5)
    • convulsions NOS (R56.9)
    • post traumatic seizures (R56.1)
    • seizure (convulsive) NOS (R56.9)
    • seizure of newborn (P90)
    Type 2 Excludes
    ICD-10-CM Diagnosis Code G40

    Epilepsy and recurrent seizures

      2016 2017 2018 2019 2020 2021 Non-Billable/Non-Specific Code
    Note
    • the following terms are to be considered equivalent to intractable: pharmacoresistant (pharmacologically resistant), treatment resistant, refractory (medically) and poorly controlled
    Type 1 Excludes
    • conversion disorder with seizures (F44.5)
    • convulsions NOS (R56.9)
    • post traumatic seizures (R56.1)
    • seizure (convulsive) NOS (R56.9)
    • seizure of newborn (P90)
    Type 2 Excludes
    ICD-10-CM Diagnosis Code G40.89

    Other seizures

      2016 2017 2018 2019 2020 2021 Billable/Specific Code
    Type 1 Excludes

Diagnosis Index entries containing back-references to R56.9:

ICD-10-CM Codes Adjacent To R56.9
R53.81 Other malaise
R53.82 Chronic fatigue, unspecified
R53.83 Other fatigue
R54 Age-related physical debility
R55 Syncope and collapse
R56 Convulsions, not elsewhere classified
R56.0 Febrile convulsions
R56.00 Simple febrile convulsions
R56.01 Complex febrile convulsions
R56.1 Post traumatic seizures
R56.9 Unspecified convulsions
R57 Shock, not elsewhere classified
R57.0 Cardiogenic shock
R57.1 Hypovolemic shock
R57.8 Other shock
R57.9 Shock, unspecified
R58 Hemorrhage, not elsewhere classified
R59 Enlarged lymph nodes
R59.0 Localized enlarged lymph nodes
R59.1 Generalized enlarged lymph nodes
R59.9 Enlarged lymph nodes, unspecified

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

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