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ICD-10-CM Codes
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2023 ICD-10-CM Diagnosis Code G91.4
2023 ICD-10-CM Diagnosis Code G91.4
Hydrocephalus in diseases classified elsewhere
2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code Manifestation Code
- G91.4 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
- The 2023 edition of ICD-10-CM G91.4 became effective on October 1, 2022.
- This is the American ICD-10-CM version of G91.4 - other international versions of ICD-10 G91.4 may differ.
ICD-10-CM Coding Rules
- G91.4 describes the manifestation of an underlying disease, not the disease itself.
Code FirstCode 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.
Type 1 ExcludesType 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 G91.4. 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.
The following code(s) above
G91.4 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
G91.4:
- 056 Degenerative nervous system disorders with mcc
- 057 Degenerative nervous system disorders without mcc
Convert G91.4 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
- 2022 (effective 10/1/2021): No change
- 2023 (effective 10/1/2022): No change
Code annotations containing back-references to G91.4:
- Hydrocephalus (acquired) (external) (internal) (malignant) (recurrent) G91.9
ICD-10-CM Diagnosis Code G91.9
Hydrocephalus, unspecified
2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code
- in (due to)
- neoplastic disease NEC G91.4 (see also Neoplasm)
- secondary G91.4
ICD-10-CM Codes Adjacent To G91.4
G90.529 Complex regional pain syndrome I of unspecified lower limb
G90.59 Complex regional pain syndrome I of other specified site
G90.8 Other disorders of autonomic nervous system
G90.9 Disorder of the autonomic nervous system, unspecified
G90.A Postural orthostatic tachycardia syndrome [POTS]
G91.0 Communicating hydrocephalus
G91.1 Obstructive hydrocephalus
G91.2 (Idiopathic) normal pressure hydrocephalus
G91.3 Post-traumatic hydrocephalus, unspecified
G91.4
Hydrocephalus in diseases classified elsewhere
G91.8 Other hydrocephalus
G91.9 Hydrocephalus, unspecified
G92.0 Immune effector cell-associated neurotoxicity syndrome
Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.
