Is ICD-10-CM code W88 billable?

No, W88 (Exposure to ionizing radiation) is a non-billable ICD-10-CM code. It must be coded to a more specific subcategory before it can be used for reimbursement.

What chapter does ICD-10-CM code W88 belong to?

W88 belongs to Chapter 20 of the ICD-10-CM tabular list: V00–Y99 (External Causes of Morbidity).

W88Not billable, use a more specific code below

Exposure to ionizing radiation

In Exposure to electric current, radiation and extreme ambient air temperature and pressure (W85-W99), chapter 20: External Causes of Morbidity

9 billable codes under W88: none are a CC or MCC; none map to an HCC.

Instructional notes

Excludes1: not coded here, use a different code

exposure to sunlight (X32)

Also applies, from Exposure to electric current, radiation and extreme ambient air temperature and pressure (W85-W99)

These notes sit on W85-W99 and apply to every code under it, including W88.

Excludes1: not coded here, use a different code

exposure to:
failure in dosage of radiation or temperature during surgical and medical care (Y63.2-Y63.5)
lightning (T75.0-)
natural cold (X31)
natural heat (X30)
natural radiation NOS (X39)
radiological procedure and radiotherapy (Y84.2)
sunlight (X32)

Official coding guidelines

From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.

Covers how to report external cause codes (V00-Y99) describing cause, intent, place, activity, and status. They are never principal or first-listed, and reporting is voluntary unless required.

General External Cause Coding Guidelines (page 88)
Place of Occurrence Guideline (page 89)
Activity Code (page 89)
Place of Occurrence, Activity, and Status Codes Used with other External Cause Code (page 89)
If the Reporting Format Limits the Number of External Cause Codes (page 90)
Multiple External Cause Coding Guidelines (page 90)
Child and Adult Abuse Guideline (page 90)
Unknown or Undetermined Intent Guideline (page 91)

Read Section I.C.20 (page 87), 3 more topics

All codes under W88

W88 can't be used on a claim. Pick a billable code below; grey headings group them.

W88 MS-DRGs

This code does not group to an MS-DRG as a principal diagnosis.

Other codes that refer to W88

Notes on these codes point to W88.

D84.822 Use Additional Code: exposure to ionizing radiation (W88)
G62.82 Use Additional Code: external cause code (W88-W90, X39.0-) to identify cause
J70.0 Use Additional Code: code (W88-W90, X39.0-) to identify the external cause
J70.1 Use Additional Code: code (W88-W90, X39.0-) to identify the external cause
K12.33 Use Additional Code: external cause code (W88-W90, X39.0-) to identify cause
K62.7 Use Additional Code: code to identify the type of radiation (W88.-)
L58 Use Additional Code: code to identify the source of the radiation (W88, W90)
M27.2 Use Additional Code: code (W88-W90, X39.0) to identify radiation, if radiation-induced
X39.0 Excludes1: exposure to man-made radiation (W88-W90)
Z77.123 Excludes2: radiation exposure as the cause of a confirmed condition (W88-W90, X39.0-)

About the condition

Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.

Radiation Exposure

Radiation is energy. It travels in the form of energy waves or high-speed particles. Radiation can occur naturally or be man-made. There are two types:

Code history

Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.