What is the ICD-10 code for normal pressure hydrocephalus?

The ICD-10 code for idiopathic normal pressure hydrocephalus is G91.2. It is used when the condition is confirmed as idiopathic with clinical validation.

How do you differentiate idiopathic NPH from posttraumatic hydrocephalus?

Idiopathic NPH (G91.2) is diagnosed without a history of trauma, while posttraumatic hydrocephalus (G91.3) follows trauma or CNS infection.

ICD-10 Coding for Normal Pressure Hydrocephalus(G91.2, G91.3, G91.9)

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Learn about ICD-10 coding for normal pressure hydrocephalus, including idiopathic and posttraumatic types. Understand clinical validation and documentation requirements.

Also known as:

NPHIdiopathic Normal Pressure Hydrocephalus

Related ICD-10 Code Ranges

Complete code families applicable to Normal Pressure Hydrocephalus

G00-G99Primary Range

Diseases of the nervous system

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Code Comparison: When to Use Each Code

Compare key differences between these codes to ensure accurate selection

Code	Description	When to Use	Key Documentation
G91.2	Idiopathic normal pressure hydrocephalus	Use when idiopathic NPH is confirmed by clinical and imaging criteria.	Presence of the Hakim triad: gait disturbance cognitive decline urinary incontinence Ventriculomegaly on imaging without elevated CSF pressure
G91.3	Posttraumatic hydrocephalus	Use when hydrocephalus is secondary to trauma or CNS infection.	History of trauma or CNS infection Ventriculomegaly on imaging

Primary ICD-10-CM Codes

(Idiopathic) normal pressure hydrocephalus

G91.2Billable

Differential Codes

Alternative codes to consider when ruling out similar conditions

Posttraumatic hydrocephalusG91.3

Idiopathic normal pressure hydrocephalusG91.2

Documentation & Coding Risks

Avoid these common issues when documenting Normal Pressure Hydrocephalus.

Vague documentation of symptoms.

Impact

Clinical: May lead to misdiagnosis or inappropriate treatment., Regulatory: Increases risk of audit failure., Financial: Potential loss of reimbursement due to incorrect coding.

Mitigation

Use specific clinical terms., Ensure comprehensive documentation of all symptoms.

Using unspecified codes when specific codes apply.

Impact

Reimbursement: May lead to incorrect DRG assignment and reimbursement., Compliance: Increases risk of audit and non-compliance., Data Quality: Affects accuracy of health records and data reporting.

Mitigation

Ensure documentation specifies idiopathic or posttraumatic nature of hydrocephalus.

Specificity of Diagnosis

Impact

Risk of audits due to unspecified or incorrect coding of hydrocephalus.

Mitigation

Ensure documentation supports specific ICD-10 code selection.

Frequently Asked Questions

Documentation requirements, coding pitfalls and FAQs for conditions coded with G91.2.

Primary Code

G91.2

(Idiopathic) normal pressure hydrocephalus

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ICD-10 codes3

Coding risks3

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ICD-10 Coding for Normal Pressure Hydrocephalus(G91.2, G91.3, G91.9)

Documentation & Coding Risks

Frequently Asked Questions

What is the ICD-10 code for normal pressure hydrocephalus?

How do you differentiate idiopathic NPH from posttraumatic hydrocephalus?

Related condition guides