Free, browser-based helpers for medical billers, coders and practice staff. No sign-up, and nothing you type is saved or sent.
Free Billing Tools
Quick, free helpers for billers, coders and patients. No sign-up.
Appeal Letter Generator
Pick a denial code and payer, fill in claim details, copy a ready-to-edit appeal letter.
Timely Filing Deadline Calculator
Enter the date of service or EOB date to see claim and appeal deadlines.
Denial Code Lookup
Search any CARC/RARC (e.g. CO-97, CO-16) for its meaning and fix steps.
TFL & Address Finder
Timely filing limits and claim/appeal mailing addresses for major payers.
Coming soon
Appeal Letter Generator
Pick the CARC denial code and payer, add the claim details, tick the arguments that fit, and get an editable, professional appeal letter you can copy, download as .docx or print. It covers more than 50 common denial codes, including every code with a guide on this site, and switches to Medicare redetermination wording for Original Medicare claims.
Open the Appeal Letter Generator →
Timely Filing & Appeal Deadline Calculator
Enter the date of service or the denial date and the filing limit to see the exact claim, corrected claim or appeal deadline, how many days are left, and add a reminder to your calendar. Medicare’s 12-month claim limit and 120-day redetermination rule (with the 5-day mail presumption) are built in.
Open the Timely Filing & Appeal Deadline Calculator →
Denial Code Lookup
Search CARC and RARC codes for the official X12 wording, what each code means in plain English, and how to fix it.
More tools are on the way, including a payer timely filing limit and appeal address finder.
