All ICD10 Codes
R91Non-billable

Abnormal findings on diagnostic imaging of lung

Symptoms, Signs and Abnormal Clinical and Laboratory Findings·Abnormal findings on diagnostic imaging and in function studies, without diagnosis (R90-R94)·category·FY 2026

Use a more specific code (2 billable)
R91.1Solitary pulmonary noduleR91.8Other nonspecific abnormal finding of lung field

CH18 Parent Instructions

Excludes2(Not included here. Code separately if applicable.)
  • abnormal findings on antenatal screening of mother (O28.-)
  • certain conditions originating in the perinatal period (P04-P96)
  • signs and symptoms classified in the body system chapters
  • signs and symptoms of breast (N63, N64.5)

R90-R94 Parent Instructions

Includes
  • nonspecific abnormal findings on diagnostic imaging by computerized axial tomography [CAT scan]
  • nonspecific abnormal findings on diagnostic imaging by magnetic resonance imaging [MRI][NMR]
  • nonspecific abnormal findings on diagnostic imaging by positron emission tomography [PET scan]
  • nonspecific abnormal findings on diagnostic imaging by thermography
  • nonspecific abnormal findings on diagnostic imaging by ultrasound [echogram]
  • nonspecific abnormal findings on diagnostic imaging by X-ray examination
Excludes1(Not coded here. Use a different code.)
  • abnormal findings on antenatal screening of mother (O28.-)
  • diagnostic abnormal findings classified elsewhere - see Alphabetical Index

Clinical Hierarchy

BillableHas subcodes
CH18Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99)
R90-R94Abnormal findings on diagnostic imaging and in function studies, without diagnosis (R90-R94)
R91Abnormal findings on diagnostic imaging of lungNot billable
R91.1Solitary pulmonary noduleBillable
R91.8Other nonspecific abnormal finding of lung fieldBillable

MS-DRG Classification

2026

No direct MS-DRG triggers identified.