The regulations implementing these statutes require the use of Form OWCP-1500 for medical bills submitted by certain physicians and other providers (20 CFR 10.801, 20 CFR 725.704, 30.701, 725.405 ...

The HCFA form, also known as Form HCFA 1500 or Form CMS-1500, is what noninstitutional practitioners file to payers (insurance companies). They often comprise the basis of medical claims.