What is the ICD-10 code for unspecified fever?

The ICD-10 code for unspecified fever is R50.9, used when the cause of fever is not identified.

When should R50.81 be used?

R50.81 should be used when fever is secondary to a known condition, with the underlying condition coded first.

ICD-10 Coding for Fever(R50.9, R50.2, R50.81)

Save

Explore ICD-10 coding for fever, including R50.9 and R50.81. Learn when to use each code and documentation requirements.

Also known as:

PyrexiaFebrile response

Related ICD-10 Code Ranges

Complete code families applicable to Fever

R00-R99Primary Range

Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified

→

Code Comparison: When to Use Each Code

Compare key differences between these codes to ensure accurate selection

Code	Description	When to Use	Key Documentation
R50.9	Fever, unspecified	Use when fever is present without a known cause after initial workup.	Temperature ≥100.4°F (38°C) without identified cause Negative cultures and imaging
R50.81	Fever presenting with conditions classified elsewhere	Use when fever is secondary to a documented condition.	Documented causal relationship with another condition

Primary ICD-10-CM Codes

Fever, unspecified

R50.9Billable

Differential Codes

Alternative codes to consider when ruling out similar conditions

Fever presenting with conditions classified elsewhereR50.81

Use when fever is secondary to a known condition.

Fever, unspecifiedR50.9

Documentation & Coding Risks

Avoid these common issues when documenting Fever.

Vague documentation of fever

Impact

Clinical: May lead to incorrect diagnosis, Regulatory: Non-compliance with coding standards, Financial: Potential for denied claims

Mitigation

Ensure detailed clinical notes, Use specific terminology

Using R50.9 when a specific cause is documented

Impact

Reimbursement: May lead to lower reimbursement, Compliance: Non-compliance with coding guidelines, Data Quality: Decreases accuracy of health records

Mitigation

Identify and code the specific cause of fever.

Unspecified coding

Impact

Using unspecified codes when specific codes are available

Mitigation

Regular training on coding specificity

Frequently Asked Questions

Documentation requirements, coding pitfalls and FAQs for conditions coded with R50.9.

Primary Code

R50.9

Fever, unspecified

Quick Navigation

ICD-10 codes3

Coding risks3

FAQs2

ICD-10 Coding for Fever(R50.9, R50.2, R50.81)

Documentation & Coding Risks

Frequently Asked Questions

What is the ICD-10 code for unspecified fever?

When should R50.81 be used?

Related condition guides