G91.1
BillableObstructive hydrocephalus
Obstructive hydrocephalus
Coding Notes
Includes
Conditions included under this code
- acquired hydrocephalus
Excludes 1
Codes that cannot be used together with this code (mutual exclusion)
Excludes 2
Conditions not included here, but the patient may have both
- •certain conditions originating in the perinatal periodP04-P96
- •certain infectious and parasitic diseasesA00-B99
- •complications of pregnancy, childbirth and the puerperiumO9A)O00
- •congenital malformations, deformations, and chromosomal abnormalitiesQ00-Q99
- •endocrine, nutritional and metabolic diseasesE00-E88
- •injury, poisoning and certain other consequences of external causesS00-T88
- •neoplasmsC00-D49
- •symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classifiedR00-R94
Related Codes(6)
ICD-11 Equivalents(1)
ICD-11 Equivalents
View full mappingCorresponding ICD-11 codes from the WHO crosswalk mapping
Also Known As / Clinical Terms(58)
SNOMED CT
- Acquired obstructive hydrocephalus82346000
- Non-communicating hydrocephalus82346000
- Obstructive hydrocephalus230746009
- Hydrocephalus due to and following meningitis230749002
- Postmeningitic hydrocephalus230749002
- Hydrocephalus following traumatic injury230751003
- Post-traumatic hydrocephalus230751003
- Posttraumatic hydrocephalus230751003
- Hydrocephalus associated with late onset aqueduct stenosis253131002
- Sequelae of meningitis404188001
- Obstructive hydrocephalus following traumatic injury410015008
- Post-traumatic non-communicating hydrocephalus410015008
- Post-traumatic obstructive hydrocephalus410015008
- Posttraumatic non-communicating hydrocephalus410015008
- Posttraumatic obstructive hydrocephalus410015008
- Obstructive hydrocephalus due to and following meningitis698737005
- Postmeningitic obstructive hydrocephalus698737005
- Obstructive hydrocephalus due to entrapment of inferior horn of lateral ventricle1148739007
- Obstructive hydrocephalus due to entrapment of temporal horn1148739007
- Dementia due to obstructive hydrocephalus1259675001
- Hydrocephalus due to intracranial neoplasm1263581005
- Hydrocephalus due to fourth ventricle outflow obstruction1263584002
- Hydrocephalus due to obstruction of fourth ventricle outflow1263584002
UMLS
- Hydrocephalus, ObstructiveC0549423
- Hydrocephaly obstructiveC0549423
- Non-Communicating HydrocephalusC0549423
- Non-communicating hydrocephalusC0549423
- Noncommunicating hydrocephalusC0549423
- Obstructive HydrocephalusC0549423
- Obstructive hydrocephalusC0549423
- Obstructive hydrocephalus (disorder)C0549423
- obstructive hydrocephalusC0549423
Clinical Terms
- Obstructive hydrocephalus following traumatic injury
- Obstructive hydrocephalus (disorder)
- Hydrocephalus due to fourth ventricle outflow obstruction
- Hydrocephaly obstructive
- Dementia due to obstructive hydrocephalus
- Hydrocephalus, Obstructive
- Post-traumatic obstructive hydrocephalus
- Obstructive hydrocephalus due to and following meningitis
- Obstructive hydrocephalus due to entrapment of temporal horn
- Hydrocephalus following traumatic injury
- Hydrocephalus due to intracranial neoplasm
- Hydrocephalus associated with late onset aqueduct stenosis
- Postmeningitic hydrocephalus
- Posttraumatic obstructive hydrocephalus
- Posttraumatic hydrocephalus
- Non-Communicating Hydrocephalus
- Acquired obstructive hydrocephalus
- Postmeningitic obstructive hydrocephalus
- Obstructive hydrocephalus due to entrapment of inferior horn of lateral ventricle
- Hydrocephalus due to obstruction of fourth ventricle outflow
- Post-traumatic non-communicating hydrocephalus
- Posttraumatic non-communicating hydrocephalus
- Post-traumatic hydrocephalus
- Noncommunicating hydrocephalus
- Sequelae of meningitis
- Hydrocephalus due to and following meningitis
Frequently Asked Questions
What is the ICD-10 code for obstructive hydrocephalus?
The ICD-10-CM code for obstructive hydrocephalus is G91.1. The full clinical description is "Obstructive hydrocephalus". G91.1 is a billable/specific code that can be used on insurance claims and medical billing.
What does ICD-10 code G91.1 mean?
ICD-10-CM code G91.1 represents “Obstructive hydrocephalus”. It is classified under Chapter 6: Diseases of the Nervous System and is a billable/specific code that can be used on a claim.
Is G91.1 a billable code?
Yes, G91.1 is a billable/specific ICD-10-CM code and can be used to indicate a diagnosis on a medical claim.
What chapter is G91.1 in?
G91.1 is in Chapter 6: Diseases of the Nervous System (codes G00-G99).
What codes cannot be used with G91.1?
G91.1 has Excludes1 notes indicating codes that cannot be used together with it, including: Arnold-Chiari syndrome with hydrocephalus (Q07.-); congenital hydrocephalus (Q03.-); spina bifida with hydrocephalus (Q05.-).
What SNOMED CT codes does G91.1 map to?
G91.1 maps to 12 SNOMED CT concepts: 82346000, 1259675001, 253131002, 230749002, 1263584002, and 7 more. SNOMED CT is a clinical terminology used in electronic health records.
What are the UMLS CUIs for G91.1?
G91.1 is linked to 1 UMLS Concept Unique Identifier: C0549423. The UMLS (Unified Medical Language System) integrates multiple biomedical vocabularies maintained by the U.S. National Library of Medicine.
How does G91.1 relate to ICF functioning codes?
ICF (International Classification of Functioning, Disability and Health) codes describe how conditions like obstructive hydrocephalus affect a person's functioning — body functions, activities, participation, and environmental factors. AutoICD provides ICF Core Sets for 12+ conditions and can map clinical text to ICF categories automatically. Browse the ICF directory to explore functioning codes.
What is the ICD-11 equivalent of G91.1?
G91.1 maps to the ICD-11 code: 8D64.1Z (Non-communicating hydrocephalus, unspecified).
Automate ICD-10 Coding With AI
Send clinical text to the AutoICD API and get back structured ICD-10 codes with confidence scores. Integrates into any EHR or billing system in minutes.
Includes SNOMED Clinical Terms® (SNOMED CT®) used by permission of SNOMED International. Includes content from the UMLS Metathesaurus, courtesy of the U.S. National Library of Medicine.