2019 ICD-10-CM Diagnosis Code G99.8

Other specified disorders of nervous system in diseases classified elsewhere

    2016 2017 2018 2019 Billable/Specific Code Manifestation Code
  • G99.8 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • Short description: Oth disrd of nervous system in diseases classified elsewhere
  • The 2019 edition of ICD-10-CM G99.8 became effective on October 1, 2018.
  • This is the American ICD-10-CM version of G99.8 - other international versions of ICD-10 G99.8 may differ.
ICD-10-CM Coding Rules
  • G99.8 describes the manifestation of an underlying disease, not the disease itself.
Code First
Code First Help
Certain conditions have both an underlying etiology and multiple body system manifestations due to the underlying etiology. For such conditions, ICD-10-CM has a coding convention that requires the underlying condition be sequenced first followed by the manifestation. Wherever such a combination exists there is a "use additional code" note at the etiology code, and a "code first" note at the manifestation code. These instructional notes indicate the proper sequencing order of the codes, etiology followed by manifestation. In most cases the manifestation codes will have in the code title, "in diseases classified elsewhere." Codes with this title are a component of the etiology/manifestation convention. The code title indicates that it is a manifestation code. "In diseases classified elsewhere" codes are never permitted to be used as first listed or principle diagnosis codes. They must be used in conjunction with an underlying condition code and they must be listed following the underlying condition.
  • underlying disorder, such as:
  • amyloidosis (
    ICD-10-CM Diagnosis Code E85
    • E85 Amyloidosis
      • E85.0 Non-neuropathic heredofamilial amyloidosis
      • E85.1 Neuropathic heredofamilial amyloidosis
      • E85.2 Heredofamilial amyloidosis, unspecified
      • E85.3 Secondary systemic amyloidosis
      • E85.4 Organ-limited amyloidosis
      • E85.8 Other amyloidosis
        • E85.81 Light chain (AL) amyloidosis
        • E85.82 Wild-type transthyretin-related (ATTR) amyloi...
        • E85.89 Other amyloidosis
      • E85.9 Amyloidosis, unspecified
    E85.-
    )
  • avitaminosis (
    ICD-10-CM Diagnosis Code E56.9

    Vitamin deficiency, unspecified

      2016 2017 2018 2019 Billable/Specific Code
    E56.9
    )
Type 1 Excludes
Type 1 Excludes Help
A type 1 excludes note is a pure excludes. It means "not coded here". A type 1 excludes note indicates that the code excluded should never be used at the same time as G99.8. A type 1 excludes note is for used for when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
  • nervous system involvement in:
  • cysticercosis (
    ICD-10-CM Diagnosis Code B69.0

    Cysticercosis of central nervous system

      2016 2017 2018 2019 Billable/Specific Code
    B69.0
    )
  • rubella (
    ICD-10-CM Diagnosis Code B06.0

    Rubella with neurological complications

      2016 2017 2018 2019 Non-Billable/Non-Specific Code
    B06.0-
    )
  • syphilis (
    ICD-10-CM Diagnosis Code A52.1

    Symptomatic neurosyphilis

      2016 2017 2018 2019 Non-Billable/Non-Specific Code
    A52.1-
    )
The following code(s) above G99.8 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 G99.8:
  • 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
Approximate Synonyms
  • Neuropathy (nerve damage), peripheral, disease related
ICD-10-CM G99.8 is grouped within Diagnostic Related Group(s) (MS-DRG v36.0):
  • 070 Nonspecific cerebrovascular disorders with mcc
  • 071 Nonspecific cerebrovascular disorders with cc
  • 072 Nonspecific cerebrovascular disorders without cc/mcc

Convert G99.8 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
ICD-10-CM Codes Adjacent To G99.8
G97.64 Postprocedural seroma of a nervous system organ or structure following other procedure
G97.8 Other intraoperative and postprocedural complications and disorders of nervous system
G97.81 Other intraoperative complications of nervous system
G97.82 Other postprocedural complications and disorders of nervous system
G98 Other disorders of nervous system not elsewhere classified
G98.0 Neurogenic arthritis, not elsewhere classified
G98.8 Other disorders of nervous system
G99 Other disorders of nervous system in diseases classified elsewhere
G99.0 Autonomic neuropathy in diseases classified elsewhere
G99.2 Myelopathy in diseases classified elsewhere
G99.8 Other specified disorders of nervous system in diseases classified elsewhere
H00 Hordeolum and chalazion
H00.0 Hordeolum (externum) (internum) of eyelid
H00.01 Hordeolum externum
H00.011 …… right upper eyelid
H00.012 …… right lower eyelid
H00.013 …… right eye, unspecified eyelid
H00.014 …… left upper eyelid
H00.015 …… left lower eyelid
H00.016 …… left eye, unspecified eyelid
H00.019 …… unspecified eye, unspecified eyelid

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