DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Block · Chapter 18

R90-R94 Abnormal findings on diagnostic imaging and in function studies, without diagnosis (R90-R94)

Block R90-R94 groups 5 categories with 64 billable codes in FY2027.

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)

Neighbouring blocks

Categories
5
Billable codes
64
CC codes
0
MCC codes
0
HCC V28 codes
0
New FY2027
0

Categories in R90-R94

  • R90

    Abnormal findings on diagnostic imaging of central nervous system

    Disease, diseasedwhite matter → R90.82

    • 4 billable codes
  • R91

    Abnormal findings on diagnostic imaging of lung

    Shadow, lung → R91.8

    • 2 billable codes
  • R92

    Abnormal and inconclusive findings on diagnostic imaging of breast

    Dense breasts → R92.30

    • 17 billable codes
  • R93

    Abnormal findings on diagnostic imaging of other body structures

    Pancake heart → R93.1

    • 18 billable codes
  • R94

    Abnormal results of function studies

    Lowbasal metabolic rate → R94.8

    • 23 billable codes

Index main terms

  • Abnormal, abnormality, abnormalities → R90, R91, R92, R93, R94 (73 entries)
  • Findings, abnormal, inconclusive, without diagnosis → R92, R93, R94 (53 entries)
  • Filling defect → R93 (10 entries)
  • Breast → R92 (9 entries)
  • Defect, defective → R93 (6 entries)
  • Density → R92 (6 entries)
  • Nodule(s), nodular → R91 (5 entries)
  • Inconclusive → R92, R93 (3 entries)
  • Infiltrate, infiltration → R91 (3 entries)
  • Lesion(s) (nontraumatic) → R90, R91 (3 entries)
  • Elevated, elevation → R94 (2 entries)
  • Enlargement, enlarged → R93 (2 entries)
  • Thermography (abnormal) → R92, R93 (2 entries)
  • Calcification → R92 (1 entry)
  • Calculus, calculi, calculous → R92 (1 entry)

+18 more main terms; the search box finds them by word.

Block 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

  • abnormal findings on antenatal screening of mother (O28.-) O28
  • diagnostic abnormal findings classified elsewhere - see Alphabetical Index

Notes that also apply

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