Question re: Tritium exposure

I work for a Occupational Health Physician and we saw a workers compensation patient today that was exposed to Tritium (topically). Is there a ICD9 code for Tritium exposure specifically, or should I use a general exposure diagnosis?
Thank you

Diagnosis code help

I work for a Occupational Health Physician and we saw a workers compensation patient today that was exposed to Tritium (topically). Is there a ICD9 code for Tritium exposure specifically, or should I use a general exposure diagnosis?
Thank you

Why not use the general code?

Is there any advantage to finding the exact code? I doubt the AMA had interest in creating codes for exposure to every substance on earth (or in earth) so there should be no problem using general toxic exposure code.