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    OpenPayerBilling CodesAbnormal findings on examination of other body fluids, substances and tissues, without diagnosisICD-10-CM r83-abnormal-findings-cerebrospinal-fluid
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    ICD-10-CM Code For Abnormal Findings In Cerebrospinal Fluid: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group R83 includes abnormal laboratory and microscopic findings in cerebrospinal fluid, such as elevated protein, abnormal cell counts, or presence of specific organisms or markers without a definitive underlying diagnosis. These ICD-10-CM diagnosis codes are used to document clinical findings from cerebrospinal fluid analysis that capture diagnostic uncertainty, disease severity, and central nervous system involvement. Accurate coding within the ICD-10-CM R83 group supports proper claim adjudication and complete clinical documentation for appropriate reimbursement.

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    ICD-10-CM R83: Abnormal Findings In Cerebrospinal Fluid Overview

    The ICD-10-CM R83 group captures abnormal laboratory and microscopic findings in cerebrospinal fluid that are not otherwise specified as a diagnosed disease. These codes target the central nervous system and cerebrospinal fluid analysis results such as abnormal cell counts, protein, glucose, or other cerebrospinal fluid constituents. Accurate coding matters for reimbursement because it links clinical findings to claims and supports medical necessity for further diagnostic evaluation and treatment.

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    When to Use

    Use a code from this group when cerebrospinal fluid testing yields abnormal results that are recorded without an established underlying diagnosis to explain the findings. These codes are appropriate for documenting laboratory or microscopic cerebrospinal fluid abnormalities that prompt further evaluation or monitoring.

    ICD-10-CM Codes

    9 rows

    ICD-10-CM CodeDescription
    R83.0Abnormal level of enzymes in cerebrospinal fluid
    R83.1Abnormal level of hormones in cerebrospinal fluid
    R83.2Abnormal level of other drugs, medicaments and biological substances in cerebrospinal fluid
    R83.3Abnormal level of substances chiefly nonmedicinal as to source in cerebrospinal fluid
    R83.4Abnormal immunological findings in cerebrospinal fluid
    R83.5Abnormal microbiological findings in cerebrospinal fluid
    R83.6Abnormal cytological findings in cerebrospinal fluid
    R83.8Other abnormal findings in cerebrospinal fluid
    R83.9Unspecified abnormal finding in cerebrospinal fluid

    DRG Codes

    3 rows

    DRG CodeDescription
    091Other Disorders of Nervous System with MCC
    092Other Disorders of Nervous System with CC
    093Other Disorders of Nervous System without CC/MCC

    Typical Clinical Scenarios

    • Elderly patient presents to the emergency department with acute fever, nuchal rigidity, and altered mental status; lumbar puncture is performed and cerebrospinal fluid (CSF) analysis shows elevated protein with normal glucose but no identified organism on initial testing, prompting documentation of abnormal CSF findings pending further microbiologic workup. A code from this group is used to capture the abnormal CSF laboratory result when no definitive infectious diagnosis has yet been established. Typical codes: R83.7, R83.3.
    • Middle-aged patient with progressive cognitive decline evaluated in outpatient neurology clinic; CSF testing demonstrates an abnormal protein biomarker pattern and mild pleocytosis suggestive of neurodegenerative or inflammatory process but without a confirmed diagnosis, so the abnormal CSF result is coded to reflect the unexplained laboratory abnormality contributing to the diagnostic evaluation. Typical codes: R83.2, R83.6.
    • Postoperative neurosurgical patient in the inpatient unit develops new-onset headache and low-grade fever after ventricular drain placement; CSF sampling reveals xanthochromia and elevated red blood cells consistent with blood in the CSF rather than infection, and the abnormal CSF finding is documented as a complication to guide monitoring and management. Typical codes: R83.1, R83.4.

    Related Codes

    R84-ABNORMAL-RESPIRATORY-SPECIMEN-FINDINGS

    ICD-10-CM Code For Abnormal Findings In Specimens From Respiratory Organs And Thorax: Group Overview

    R85-ABNORMAL-FINDINGS-DIGESTIVE-ORGANS

    ICD-10-CM Code For Abnormal Findings In Specimens From Digestive Organs And Abdominal Cavity: Group Overview

    R86-ABNORMAL-FINDINGS-MALE-GENITAL-ORGANS

    ICD-10-CM Code For Abnormal Findings In Specimens From Male Genital Organs: Group Overview

    R87-ABNORMAL-FINDINGS-FEMALE-GENITAL

    ICD-10-CM Code For Abnormal Findings In Specimens From Female Genital Organs: Group Overview

    R88-ABNORMAL-FINDINGS-IN-BODY-FLUIDS

    ICD-10-CM Code For Abnormal Findings In Other Body Fluids And Substances: Group Overview

    R89-ABNORMAL-FINDINGS-IN-SPECIMENS

    ICD-10-CM Code For Abnormal Findings In Specimens From Other Organs Systems And Tissues: Group Overview

    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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