Is W99.XXXA a billable ICD-10-CM code?

Yes. W99.XXXA is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does W99.XXXA sit in the tabular list?

External causes of morbidity (V00-Y99), in the block Exposure to electric current, radiation and extreme ambient air temperature and pressure (W85-W99).

W99.XXXA

W99.XXXA — Exposure to other man-made environmental factors, initial encounter

Billable / specific codeICD-10-CMPOA exempt

W99.XXXA is a billable, specific ICD-10-CM code for exposure to other man-made environmental factors, initial encounter. It is valid for submission on a claim.

7th character "A" — initial encounter

The appropriate 7th character is to be added to code W99

A: initial encounter
D: subsequent encounter
S: sequela

Risk adjustment

W99.XXXA does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.

Related codes at this level

Codes that share W99. If W99.XXXA is not quite right, the correct code is usually one of these.

Questions about W99.XXXA

Is W99.XXXA a billable ICD-10-CM code?: Yes. W99.XXXA is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does W99.XXXA sit in the tabular list?: External causes of morbidity (V00-Y99), in the block Exposure to electric current, radiation and extreme ambient air temperature and pressure (W85-W99).