DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

R91 Abnormal findings on diagnostic imaging of lung

  • Header · not billable

R91 is not billable. The category heads 2 billable codes in FY2027: the 2 codes directly below it.

Index → code

  • Shadow, lung → R91.8
  • Masslung → R91.8
  • Infiltrate, infiltrationlung → R91.8

Where it sits

  1. Chapter 18 Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99)
  2. R90-R94 Abnormal findings on diagnostic imaging and in function studies, without diagnosis (R90-R94)
  3. R91 Abnormal findings on diagnostic imaging of lung
Billable codes
2
Subdivisions
2
CC / MCC codes
0 / 0
HCC V28 codes
0
New FY2027
0
Index entries
13

Codes in R91

  1. R91.1
    Solitary pulmonary nodule
    Billable
    Inclusion terms 2

    Inclusion terms

    • Coin lesion lung
    • Solitary pulmonary nodule, subsegmental branch of the bronchial tree
  2. R91.8
    Other nonspecific abnormal finding of lung field
    Billable
    Inclusion terms 3

    Inclusion terms

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

Sources of each column.

Instructions

Notes that also apply

Block R90-R94 instructions (Includes 6, Excludes1 2): printed on the block page.

Chapter 18 instructions (Notes 9, Excludes2 4): printed on the chapter 18 page.

Index entries

  • Shadow, lung → R91.8
  • Lesion(s) (nontraumatic)coin, lung → R91.1
  • Lesion(s) (nontraumatic)lung (coin) → R91.1
  • Nodule(s), nodularlung, solitary (subsegmental branch of the bronchial tree) → R91.1
  • Nodule(s), nodularpulmonary, solitary (subsegmental branch of the bronchial tree) → R91.1
  • Nodule(s), nodularsolitary, lung (subsegmental branch of the bronchial tree) → R91.1
  • Infiltrate, infiltrationlung → R91.8
  • Infiltrate, infiltrationon chest x-ray → R91.8
  • Infiltrate, infiltrationpulmonary → R91.8
  • Masslung → R91.8
  • Abnormal, abnormality, abnormalitiesdiagnostic imaginglung (field) → R91.8
  • Nodule(s), nodularlung, solitary (subsegmental branch of the bronchial tree)multiple → R91.8
  • Nodule(s), nodularsolitary, lung (subsegmental branch of the bronchial tree)multiple → R91.8

NCHS Alphabetic Index. Index first, then the Tabular List.

Hierarchy