About DenialKit

DenialKit helps medical billers, front-office staff, and small billing companies work denied claims faster. Denial codes are short and cryptic, and figuring out what a payer actually wants usually means digging through remittances, portals, and policy documents. We put the answers in one place, in plain English.

What you can do here:

• Look up a denial code to see common causes and the steps to fix it.
• Check an NPI against the public NPPES registry.
• Download the denial prevention checklist.
• Draft appeal letters with the AI appeal letter writer or our letter templates, and check a whole spreadsheet of NPIs at once with Pro.

We never ask for patient information, and our tools are built to keep it out: the letter writer blocks anything that looks like patient details, and templates use placeholders you fill in on your own computer.

Everything here is general guidance. Payer rules vary, so always check the specific payer's policy before you act.