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ICD10BillableValid for clinical use

ICD-10 Code R91.8: Other nonspecific abnormal finding of lung field

R91.8 is a billable ICD-10 diagnosis code used to classify Other nonspecific abnormal finding of lung field in medical records and claims. You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records. ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. This code sits within the broader ICD-10 area for Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99).

Reviewed by HealthAssure Clinical TeamUpdated 26 May 2026

What is this code?

ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. This code sits within the broader ICD-10 area for Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99).

When is it used?

  • May be used when a clinician documents other nonspecific abnormal finding of lung field in a patient's medical record.
  • May appear in hospital records, claims, referrals, and clinical documentation.
  • This code can be used as a clinically usable diagnosis entry in standardized coding workflows.

What it does not mean

  • A code alone does not explain severity, treatment plan, or outcome.
  • A medical code should not be treated as a substitute for a doctor's diagnosis or advice.

Code hierarchy

chapter
18Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99)
block
R90-R94Abnormal findings on diagnostic imaging and in function studies, without diagnosis
category
R91Abnormal findings on diagnostic imaging of lung
currentR91

Official coding notes

Inclusion terms
  • Lung mass NOS found on diagnostic imaging of lung
  • Pulmonary infiltrate NOS
  • Shadow, lung

Where you may see this code

You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records.

Related specialists

General PhysicianPulmonologist

Coding guidelines

Common synonyms

Other nonspecific abnormal finding of lung field

Frequently asked questions

Code details

CodeR91.8
SystemICD10
Display nameOther nonspecific abnormal finding of lung field
ChapterSymptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99)
BlockAbnormal findings on diagnostic imaging and in function studies, without diagnosis

Flags

BillableYes
Valid clinical useYes

Source

SourceICD-10
Version2026-annual
Releaseannual
Year2026

Index terms

Matched terms
Abnormal, abnormality, abnormalitiesInfiltrate, infiltrationInfiltrate, infiltrationInfiltrate, infiltrationMassNodule(s), nodularNodule(s), nodularShadow, lung

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.

ICD-10 Code R91.8 for Other nonspecific abnormal finding of lung field | HealthAssure