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Home/Diagnosis/ICD-10 Coding for Fever of Unknown Origin

ICD-10 Coding for Fever of Unknown Origin

R50.9
R50.2

Complete ICD-10-CM coding and documentation guide for icd-10 coding for fever of unknown origin includes clinical validation requirements, medical necessity guidelines, and coding policies.

Also Known as:
FUO
Pyrexia of Unknown Origin
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Key Information: ICD-10 Coding for Fever of Unknown Origin

Essential facts and insights about ICD-10 Coding for Fever of Unknown Origin

Use ICD-10 code R50.9 for fever, unspecified, ensuring proper documentation in clinical notes.

Primary ICD-10-CM Codes

Fever, unspecified

Billable Code
R50.9
Billable

Diagnostic Criteria

clinical:
  • Fever persists ≥3 weeks with no identified cause.
documentation:
  • Detailed records of fever pattern and negative diagnostic tests.

Applicable To

  • • Fever of unknown origin

Important Notes

  • • Ensure documentation supports the duration and extent of the fever and workup.

Drug-induced fever

Billable Code
R50.2
Billable

Diagnostic Criteria

clinical:
  • Fever linked to recent drug administration
documentation:
  • Resolution upon drug discontinuation

Important Notes

  • • Ensure provider documentation explicitly links fever to drug use.
Ancillary Codes

Additional codes that may be used with this diagnosis

B20

HIV disease

Use if FUO is related to HIV.

D72.89

Other specified disorders of white blood cells

Use if leukocytosis is present.

Frequently Asked Questions

What is the ICD-10 code for fever of unknown origin?

The ICD-10 code for fever of unknown origin is R50.9, used when fever persists for over 3 weeks without an identifiable cause.

When should R50.9 be used?

Use R50.9 when a patient has a fever lasting over 3 weeks with no identifiable cause after thorough evaluation.

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