Tools and guides for smarter medical billing
Insurance phone numbers, filing limits, denial codes, modifiers and more, free for billers and AR callers. For billing organizations, a licensed Claim Note Tool that writes every claim status note in seconds.
Free to use. For educational and informational purposes only.
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Everything a billing team looks up, in one place
Medical billers, coders and AR specialists use these pages to work faster, avoid wrong numbers and reduce denials. Type a word to find the page you need.
Look up during a call
Insurance phone numbers
Payer contact numbers, so your caller reaches the right line the first time.
Timely filing limits
How long each payer allows for filing, so claims go out in time.
TFL and AFL calculator
Work out filing deadlines without counting days by hand.
Denial codes
Look up denial codes and what they mean.
Learn and reference
Definitions
Plain meanings of the terms used in medical billing.
Abbreviations
Spell out the short forms used in medical billing.
Modifiers
The modifiers used in medical billing, in one list.
CMS-1500 boxes
What goes in each box of the CMS-1500 claim form.
RCM steps
The revenue cycle management steps, explained in order.
File tools
No page matches that word. Tell us what you were looking for.
For billing organizations: the Claim Note Tool
Your callers spend about 3 hours writing notes for every 5 hours of calls. The tool builds each claim status note in seconds, while the caller is still on the phone.
- 2 to 3 hours saved per AR caller, every working day
- One standard format, so leads stop fixing notes before the client review
- Your own license and private page for your company
- Free 1-week trial
Written by hand
Cigna says the claim is not on file. Spoke with Ali and he said it was sent to the wrong payer ID, so I resubmitted it as a new claim today.
From the tool
Call to Cigna, on 800-555-0102, spoke with Ali, on 10/06/2026. The representative confirmed that the claim status is Not on file. Reason: Submitted to wrong payer ID/ insurance. Action taken: Resubmitted new claim.
Who MBillers is for
Whether you make the calls, build the claims or run the team, there is a page for the work in front of you.
AR callers
Phone numbers, filing limits and denial codes to check while the call is on.
Billers and coders
Modifiers, CMS-1500 boxes, definitions and abbreviations at hand.
Team leads
One standard note format, so no one cleans up statuses before a client review.
Billing company owners
A company license for the Claim Note Tool, with a free trial first.
Help us keep MBillers accurate
Found a wrong number or an outdated rule? Have something that would help other billers, or a page you would like to see? Send it to us. Every submission is reviewed, and approved contributions are added for the whole billing community.
Always confirm important details with the payer before you act on them.
Questions people ask
Is everything on MBillers free?
Yes. The reference pages, calculators, PDF Kit and Images Kit are free. The only paid product is the Claim Note Tool for billing organizations, and it starts with a free 1-week trial.
Who is MBillers for?
Medical billers, coders, AR callers and billing teams. It is made to support the billing process with practical information and tools.
Can I rely on the information?
The information is shared for educational and informational purposes. We review corrections and additions before they go on the site, but please confirm important details with the payer.
How do I report a mistake or suggest a page?
Use the Contact us page. Tell us which page and what should change, and we will check it.
What is the Claim Note Tool?
A licensed tool that builds claim status notes for your whole team in one standard format. Each company gets its own license and private page. You can read the details on the Claim Note Tool page.
Is your team still writing every claim note by hand?
Try the Claim Note Tool free for 1 week and see how many hours your callers get back.