All ICD10 Codes

R91

Non-Billable
ChapterR00–R99
Rankcategory
Official Description

Abnormal findings on diagnostic imaging of lung

Use a more specific code (2 billable)
R91.1Solitary pulmonary noduleR91.8Other nonspecific abnormal finding of lung field
Metadata & Insights
  • •Non-billable category (requires more specific sub-code).
  • •Chapter 18: Symptoms, Signs and Abnormal Clinical and Laboratory Findings (R00-R99).

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

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to R91:

blockR90-R94
Abnormal findings on diagnostic imaging and in function studies, without diagnosis (R90-R94)
View context instructions
chapterCH18
Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99)
View context instructions

MS-DRG Classification

2026

No direct MS-DRG triggers identified.

Cross Reference

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