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ICD-10-CM Codes
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G00-G99
Diseases of the nervous system
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G89-G99
Other disorders of the nervous system
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G91-
Hydrocephalus
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2021 ICD-10-CM Diagnosis Code G91.1
2021 ICD-10-CM Diagnosis Code G91.1
Obstructive hydrocephalus
2016 2017 2018 2019 2020 2021 Billable/Specific Code
- G91.1 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 G91.1 became effective on October 1, 2020.
- This is the American ICD-10-CM version of G91.1 - other international versions of ICD-10 G91.1 may differ.
The following code(s) above
G91.1 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
G91.1:
- Hydrocephalus, obstructive
ICD-10-CM G91.1 is grouped within Diagnostic Related Group(s) (MS-DRG v38.0):
- 056 Degenerative nervous system disorders with mcc
- 057 Degenerative nervous system disorders without mcc
Convert G91.1 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 G91.1:
- Block, blocked
- Hydrocephalus (acquired) (external) (internal) (malignant) (recurrent) G91.9
ICD-10-CM Diagnosis Code G91.9
Hydrocephalus, unspecified
2016 2017 2018 2019 2020 2021 Billable/Specific Code
- Obstruction, obstructed, obstructive
- Occlusion, occluded
- Stenosis, stenotic (cicatricial) - see also Stricture
- aqueduct of Sylvius (congenital) Q03.0
ICD-10-CM Diagnosis Code Q03.0
Malformations of aqueduct of Sylvius
2016 2017 2018 2019 2020 2021 Billable/Specific Code POA Exempt
Applicable To- Anomaly of aqueduct of Sylvius
- Obstruction of aqueduct of Sylvius, congenital
- Stenosis of aqueduct of Sylvius
- Stricture - see also Stenosis
- aqueduct of Sylvius (congenital) Q03.0
ICD-10-CM Diagnosis Code Q03.0
Malformations of aqueduct of Sylvius
2016 2017 2018 2019 2020 2021 Billable/Specific Code POA Exempt
Applicable To- Anomaly of aqueduct of Sylvius
- Obstruction of aqueduct of Sylvius, congenital
- Stenosis of aqueduct of Sylvius
ICD-10-CM Codes Adjacent To G91.1
G90.52 Complex regional pain syndrome I of lower limb
G90.521 Complex regional pain syndrome I of right lower limb
G90.522 Complex regional pain syndrome I of left lower limb
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
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
G93 Other disorders of brain
G93.1 Anoxic brain damage, not elsewhere classified
G93.2 Benign intracranial hypertension
Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.
