Diagnosis Codes - ICD10 and DSM IV Codes

Here's another question from our "Ask the Biller" page.

Hi again! I'm just wondering whether Diagnostic Codes, Line 21 on CMS 1500 are to be exclusively ICD 10 codes or are DSM IV codes also accepted?

Thank you, Carol

We answered:

You can use either ICD or DSM codes in box 21, as long as the codes are recognized by the individual insurance carrier that you are billing.