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    v1.0.28
    OpenPayerBilling CodesGeneral symptoms and signsICD-10-CM r50-fever-of-other-and-unknown-origin
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    ICD-10-CM Code For Fever Of Other And Unknown Origin: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group R50 includes diagnoses for fever of other and unknown origin, encompassing febrile states not attributed to a specific infectious or inflammatory cause and fevers that are otherwise unspecified. These ICD-10-CM diagnosis codes are used to document clinical encounters where elevated temperature is a primary presenting sign, capturing disease severity, systemic involvement, and diagnostic uncertainty relevant to this group. Accurate coding within the ICD-10-CM R50 group supports proper claim adjudication, complete clinical documentation, and appropriate reimbursement.

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    ICD-10-CM R50: Fever Of Other And Unknown Origin Overview

    The ICD-10-CM R50 diagnosis group captures fevers that are not classified elsewhere or whose cause remains undetermined, covering systemic febrile presentations rather than a specific organ system. These codes apply to clinical encounters documenting elevated body temperature when an underlying etiology is not identified at the time of coding. Accurate coding matters for reimbursement because it communicates diagnostic uncertainty and supports appropriate claim processing and medical necessity review. Precise documentation also informs downstream clinical decision making and utilization management.

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    When to Use

    Use a code from this group when a patient presents with fever and the clinician documents the fever as other, unspecified, or of unknown origin without an identified cause at the time of the encounter. Select these codes when fever is the primary reason for the visit or when diagnostic workup has not yet established a specific infectious or inflammatory diagnosis.

    ICD-10-CM Codes

    6 rows

    ICD-10-CM CodeDescription
    R50.2Drug induced fever
    R50.81Fever presenting with conditions classified elsewhere
    R50.82Postprocedural fever
    R50.83Postvaccination fever
    R50.84Febrile nonhemolytic transfusion reaction
    R50.9Fever, unspecified

    DRG Codes

    1 rows

    DRG CodeDescription
    864Fever and Inflammatory Conditions

    Typical Clinical Scenarios

    • A previously healthy adult presents to urgent care with 48 hours of high fever (temperature >38.5°C), malaise, and myalgias without localized symptoms, normal initial infectious workup, and no identified source after basic labs and chest X‑ray; the clinician documents an unexplained acute febrile illness while evaluation continues. Typical codes: R50.2
    • An elderly nursing home resident has recurrent low‑grade fevers over several weeks with intermittent confusion and negative cultures; after outpatient and facility evaluations fail to reveal an infectious focus and the fever persists, the provider records a chronic/ongoing fever of unknown origin as part of the problem list. Typical codes: R50.84
    • A patient hospitalized for neutropenia following chemotherapy develops fever without localizing signs; blood and imaging studies are pending but the immediate inpatient record identifies fever as a significant clinical finding requiring monitoring and empiric management. Typical codes: R50.81, R50.82

    Related Codes

    R51-HEADACHE

    ICD-10-CM Code For Headache: Group Overview

    R52-PAIN-UNSPECIFIED

    ICD-10-CM Code For Pain Unspecified: Group Overview

    R53-MALAISE-AND-FATIGUE

    ICD-10-CM Code For Malaise And Fatigue: Group Overview

    R54-AGE-RELATED-PHYSICAL-DEBILITY

    ICD-10-CM Code For Age Related Physical Debility: Group Overview

    R55-SYNCOPE-AND-COLLAPSE

    ICD-10-CM Code For Syncope And Collapse: Group Overview

    R56-CONVULSIONS-NOT-ELSEWHERE-CLASSIFIED

    ICD-10-CM Code For Convulsions Not Elsewhere Classified: Group Overview

    R57-SHOCK-NOT-ELSEWHERE-CLASSIFIED

    ICD-10-CM Code For Shock Not Elsewhere Classified: Group Overview

    R58-HEMORRHAGE-NOT-ELSEWHERE-CLASSIFIED

    ICD-10-CM Code For Hemorrhage Not Elsewhere Classified: Group Overview

    R59-ENLARGED-LYMPH-NODES

    ICD-10-CM Code For Enlarged Lymph Nodes: Group Overview

    R60-EDEMA-NOT-ELSEWHERE-CLASSIFIED

    ICD-10-CM Code For Edema Not Elsewhere Classified: Group Overview

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    Frequently Asked Questions

    References

    1. 1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
    2. 2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
    3. 3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.
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