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    OpenPayerBilling CodesAbnormal findings on diagnostic imaging and in function studies, without diagnosisICD-10-CM r90-abnormal-findings-central-nervous-system
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    ICD-10-CM Code For Abnormal Findings On Diagnostic Imaging Of Central Nervous System: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group R90 includes abnormal imaging findings of the central nervous system without a confirmed diagnosis, such as unspecified lesions, masses, or structural anomalies detected on brain or spinal imaging. These ICD-10-CM diagnosis codes are used to document imaging-detected abnormalities that require further evaluation, capturing disease location, extent, or nondiagnostic findings relevant to patient management. Accurate coding within the ICD-10-CM R90 group supports proper claim adjudication and complete clinical documentation for appropriate reimbursement.

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    ICD-10-CM R90: Abnormal Findings On Diagnostic Imaging Of Central Nervous System Overview

    The ICD-10-CM R90 group captures abnormal or unexpected findings on diagnostic imaging studies of the brain and spinal cord when a definitive diagnosis is not established. These codes target central nervous system imaging results such as lesions, masses, or structural abnormalities identified on modalities like magnetic resonance imaging and computed tomography. Accurate coding matters for reimbursement because it documents the reason for imaging, supports medical necessity, and helps ensure appropriate claim processing.

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    When to Use

    Use a code from this group when an imaging study documents an abnormal finding of the central nervous system but a specific diagnosis has not been determined or confirmed. These codes are appropriate for reporting incidental or indeterminate imaging abnormalities that prompt further evaluation or follow-up.

    ICD-10-CM Codes

    4 rows

    ICD-10-CM CodeDescription
    R90.0Intracranial space-occupying lesion found on diagnostic imaging of central nervous system
    R90.81Abnormal echoencephalogram
    R90.82White matter disease, unspecified
    R90.89Other abnormal findings on diagnostic imaging of central nervous system

    DRG Codes

    7 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
    606Minor Skin Disorders with MCC
    607Minor Skin Disorders without MCC
    947Signs and Symptoms with MCC
    948Signs and Symptoms without MCC

    Typical Clinical Scenarios

    • An elderly patient with progressive cognitive decline undergoes brain MRI to evaluate for dementia; imaging shows nonspecific diffuse cortical and subcortical white matter signal changes without a definitive degenerative diagnosis, prompting documentation of an abnormal imaging finding rather than a confirmed disease. Typical codes: R90.0, R90.82
    • A middle-aged adult presents to the emergency department after a motor vehicle collision with new-onset headache and transient confusion; head CT demonstrates a small, nonacute focal intracranial lesion or indeterminate mass-like density that requires further outpatient workup because no definitive diagnosis can be made from the imaging alone. Typical codes: R90.89, R90.81
    • A patient with known metastatic cancer has routine surveillance brain MRI that identifies multiple new indeterminate enhancing lesions too small to biopsy; these unexpected imaging abnormalities are documented as abnormal findings to guide staging and follow-up rather than as a confirmed metastatic diagnosis on imaging alone. Typical codes: R90.81, R90.89}

    Related Codes

    R91-ABNORMAL-IMAGING-FINDINGS-LUNG

    ICD-10-CM Code For Abnormal Findings On Diagnostic Imaging Of Lung: Group Overview

    R92-ABNORMAL-BREAST-IMAGING-FINDINGS

    ICD-10-CM Code For Abnormal And Inconclusive Findings On Diagnostic Imaging Of Breast: Group Overview

    R93-ABNORMAL-DIAGNOSTIC-IMAGING-FINDINGS

    ICD-10-CM Code For Abnormal Findings On Diagnostic Imaging Of Other Body Structures: 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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