ICD-10 Coding for Fever of Unknown Origin(R50.9, R50.2)
Complete ICD-10-CM coding and documentation guide for Fever of Unknown Origin. Includes clinical validation requirements, documentation requirements, and coding pitfalls.
Also known as:
Related ICD-10 Code Ranges
Complete code families applicable to Fever of Unknown Origin
R50Primary Range
Fever of other and unknown origin
This range includes codes for fever conditions where the origin is not immediately identifiable, including FUO.
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 persists for ≥3 weeks without an identifiable cause after thorough evaluation. |
|
| R50.2 | Drug-induced fever | Use when fever is directly linked to drug intake. |
|
Clinical Decision Support
Always review the patient's clinical documentation thoroughly. When in doubt, choose the more specific code and ensure documentation supports it.
Key Information: ICD-10 code for fever of unknown origin
Essential facts and insights about Fever of Unknown Origin
Primary ICD-10-CM Codes for fever of unknown origin
Decision Criteria
clinical Criteria
- Fever persists ≥3 weeks with no identified cause.
documentation Criteria
- Detailed records of fever pattern and negative diagnostic tests.
Applicable To
- Fever of unknown origin
Excludes
- Fever due to known conditions (e.g., infections, autoimmune diseases)
Clinical Validation Requirements
- Documented fever ≥100.9°F for ≥3 weeks
- Negative blood cultures and imaging studies
- No identifiable cause after extensive workup
Code-Specific Risks
- Incorrectly using R50.9 when an underlying condition is identified.
Coding Notes
- Ensure documentation supports the duration and extent of the fever and workup.
R50.2 - Drug-induced fever
Use when fever is directly linked to drug intake.
Excludes
- Fever due to other causes
Clinical Validation Requirements
- Fever linked to recent drug administration
- Resolution upon drug discontinuation
Coding Notes
Ensure provider documentation explicitly links fever to drug use.
Ancillary Codes
Additional codes that should be used in conjunction with the main diagnosis codes when applicable.
Documentation & Coding Risks
Avoid these common documentation and coding issues when documenting Fever of Unknown Origin to ensure proper reimbursement, maintain compliance, and reduce audit risk. These guidelines are particularly important when using ICD-10 code R50.9.
Impact
Clinical: Leads to misdiagnosis or delayed treatment., Regulatory: Fails to meet coding standards., Financial: Potential for denied claims.
Mitigation Strategy
Ensure detailed fever history is recorded., Include all diagnostic tests performed.
Impact
Reimbursement: Incorrect DRG assignment may occur., Compliance: Non-compliance with coding guidelines., Data Quality: Inaccurate clinical data representation.
Mitigation Strategy
Code the underlying condition first, followed by R50.9 if needed.
Impact
Failure to code underlying conditions first.
Mitigation Strategy
Regular training on ICD-10 sequencing rules.
Documentation errors, coding pitfalls, and audit risks are interconnected aspects of medical coding and billing. Addressing all three areas helps ensure accurate coding, optimal reimbursement, and regulatory compliance.
Frequently Asked Questions
Common questions about ICD-10 coding for Fever of Unknown Origin, with expert answers to help guide accurate code selection and documentation.
Documentation Templates for Fever of Unknown Origin
Use these documentation templates to ensure complete and accurate documentation for Fever of Unknown Origin. These templates include all required elements for proper coding and billing.
Inpatient FUO Workup
Specialty: Internal MedicineRequired Elements
- Fever pattern documentation
- Negative diagnostic tests
- Therapeutic trials
Example Documentation
Examples: Poor vs. Good Documentation
Poor Documentation Example
Good Documentation Example
Explanation
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