DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Block · Chapter 18

R40-R46 Symptoms and signs involving cognition, perception, emotional state and behavior (R40-R46)

Block R40-R46 groups 7 categories with 157 billable codes in FY2027.

Where it sits

  1. Chapter 18 Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99)
  2. R40-R46 Symptoms and signs involving cognition, perception, emotional state and behavior (R40-R46)

Neighbouring blocks

Categories
7
Billable codes
157
CC codes
6
MCC codes
37
HCC V28 codes
44
New FY2027
0

Categories in R40-R46

  • R40

    Somnolence, stupor and coma

    Coma → R40.20

    • 101 billable codes
    • 1 CC
    • 37 MCC
    • 43 with HCC
  • R41

    Other symptoms and signs involving cognitive functions and awareness

    Trance → R41.89

    • 16 billable codes
    • 1 CC
  • R42

    Dizziness and giddiness

    Vertigo → R42

    • Billable, no subdivisions
  • R43

    Disturbances of smell and taste

    Ageusia → R43.2

    • 5 billable codes
  • R44

    Other symptoms and signs involving general sensations and perceptions

    Hallucination → R44.3

    • 6 billable codes
    • 3 CC
  • R45

    Symptoms and signs involving emotional state

    Anger → R45.4

    • 18 billable codes
    • 1 CC
    • 1 with HCC
  • R46

    Symptoms and signs involving appearance and behavior

    Overactivity → R46.3

    • 10 billable codes

Index main terms

  • Coma → R40 (50 entries)
  • Symptoms NEC → R41, R44, R45, R46 (20 entries)
  • Disturbance(s) → R42, R43, R45 (12 entries)
  • Behavior → R46 (11 entries)
  • Deficit → R41 (8 entries)
  • Hallucination → R44 (7 entries)
  • State (of) → R40, R45 (6 entries)
  • Neglect → R41 (4 entries)
  • Amnesia → R41 (3 entries)
  • Appearance → R46 (3 entries)
  • Disorder (of) → R41, R43 (3 entries)
  • Glasgow coma scale → R40 (3 entries)
  • Syndrome → R41, R42 (3 entries)
  • Alteration (of), Altered → R40, R41 (2 entries)
  • Change(s) (in) (of) → R41 (2 entries)

+66 more main terms; the search box finds them by word.

Block instructions

Excludes2

  • symptoms and signs constituting part of a pattern of mental disorder (F01-F99) F01 F99

Notes that also apply

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