DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

X39 Exposure to other forces of nature

  • Header · not billable
  • Codes take a 7th character

X39 is not billable. The category heads 9 billable codes in FY2027, grouped under 2 subdivisions. Its codes take a 7th character, so none is complete with fewer than 7 characters.

Where it sits

  1. Chapter 20 External causes of morbidity (V00-Y99)
  2. X30-X39 Exposure to forces of nature (X30-X39)
  3. X39 Exposure to other forces of nature
Billable codes
9
Subdivisions
2
CC / MCC codes
0 / 0
HCC V28 codes
0
New FY2027
0
Index entries
0

Codes in X39

  1. X39.0
    Exposure to natural radiation
    Header
    Excludes1 3

    Excludes1

    • contact with and (suspected) exposure to radon and other naturally occurring radiation (Z77.123) Z77.123
    • exposure to man-made radiation (W88-W90) W88 W90
    • exposure to sunlight (X32) X32
  2. X39.01
    Exposure to radon +7th: A D S
    Needs 7th characterExempt
  3. X39.08
    Exposure to other natural radiation +7th: A D S
    Needs 7th characterExempt
  4. X39.8
    Other exposure to forces of nature +7th: A D S
    Needs 7th characterExempt

Sources of each column. Rows marked +7th need a 7th character: pick one to build the full code; its code card has its own flags.

Instructions

Notes that also apply

Chapter 20 instructions (Notes 1): printed on the chapter 20 page.

7th characters

7th characters for X39 defined here

The appropriate 7th character is to be added to each code from category X39

7th characters for X39
7thMeaning (NCHS)
Ainitial encounter
Dsubsequent encounter
Ssequela

A code that takes a 7th character is invalid without it; the placeholder X fills a code shorter than 6 characters (Official Guidelines I.A.5). How 7th characters work.

Hierarchy