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    OpenPayerBilling CodesAbnormal findings on diagnostic imaging and in function studies, without diagnosisICD-10-CM r91-abnormal-imaging-findings-lung
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    ICD-10-CM Code For Abnormal Findings On Diagnostic Imaging Of Lung: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group R91 includes abnormal or unspecified findings on diagnostic imaging of the lungs such as solitary pulmonary nodules, localized or diffuse lung opacities, and non‑specific radiographic abnormalities that do not yet have a confirmed underlying diagnosis. These ICD-10-CM diagnosis codes are used to document clinical scenarios involving unexpected or unexplained imaging findings of the respiratory system, capturing the presence and characterization of imaging abnormalities relevant to care planning and follow‑up. Accurate coding within the ICD-10-CM R91 group supports proper claim adjudication, complete clinical documentation, and appropriate reimbursement.

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    ICD-10-CM R91: Abnormal Findings On Diagnostic Imaging Of Lung Overview

    The diagnoses in this group denote abnormal radiologic or imaging findings of the lungs that are not assigned a definitive diagnosis within the same encounter. They target the respiratory system and commonly include descriptions such as solitary pulmonary nodule, diffuse interstitial changes, or other nonspecific pulmonary opacities. Accurate coding matters for reimbursement because it documents the reason for imaging, guides subsequent workup, and supports medical necessity for services billed.

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    When to Use

    Use a code from this group when imaging reveals an abnormal pulmonary finding that lacks a confirmed diagnosis during the same clinical encounter. These codes are appropriate to document the imaging result, to support follow‑up evaluation, or to justify additional diagnostic testing.

    ICD-10-CM Codes

    2 rows

    ICD-10-CM CodeDescription
    R91.1Solitary pulmonary nodule
    R91.8Other nonspecific abnormal finding of lung field

    DRG Codes

    3 rows

    DRG CodeDescription
    204Respiratory Signs and Symptoms
    205Other Respiratory System Diagnoses with MCC
    206Other Respiratory System Diagnoses without MCC

    Typical Clinical Scenarios

    • An adult patient with a long smoking history undergoes a routine chest radiograph for preoperative evaluation and the report notes a 1.5 cm solitary pulmonary nodule without prior imaging for comparison. The finding is incidental, asymptomatic, and requires further characterization or surveillance rather than an immediate established diagnosis, so an abnormal imaging finding code is assigned. Typical codes: R91.1
    • A middle-aged patient presents to the emergency department with acute pleuritic chest pain and shortness of breath; a chest CT is performed to evaluate for pulmonary embolism and instead demonstrates multiple ill-defined nodules and focal airspace consolidation of uncertain etiology. Because the imaging shows abnormal lung findings that do not yet constitute a specific diagnosis, an abnormal imaging code is used while diagnostic workup continues. Typical codes: R91.8
    • An elderly patient with a history of prior treated lung cancer has routine surveillance CT that documents new focal scarring and density changes in the lung distinct from prior imaging, but without biopsy or definitive confirmation of recurrence at that visit. The report documents abnormal imaging changes as a comorbidity affecting management and prompting further evaluation, so an abnormal imaging finding code is assigned. Typical codes: R91.8

    Related Codes

    R90-ABNORMAL-FINDINGS-CENTRAL-NERVOUS-SYSTEM

    ICD-10-CM Code For Abnormal Findings On Diagnostic Imaging Of Central Nervous System: 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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