Free Billing Tools
Useful Medical Billing Tools — Not Just More Articles
Check NPIs and Place of Service codes, review CMS-1500 claims, inspect 837P files, read common 999/277CA acknowledgments, estimate patient responsibility, calculate Medicare PFS payments, and find timely filing deadlines. Each tool is free and works directly in the browser.
Choose a Free Billing Tool
Each page is a complete standalone tool with explanations, examples and printable results.
837P Validator & Viewer
Open an 837P file locally, inspect claims and service lines, and run basic X12 envelope, total and NPI checks.
Open free tool →999 + 277CA Response Reader
Open a common electronic claim acknowledgment file and turn raw status segments into a readable first-pass summary.
Open free tool →CMS-1500 Claim Checker
Check common CMS-1500 completeness, NPI, service-line, diagnosis-pointer and charge-total issues before filing.
Open free tool →NPI Validator
Check a 10-digit NPI format and CMS/Luhn check digit before placing the identifier on a professional claim.
Validate an NPI →Place of Service Code Lookup
Search assigned CMS two-digit POS codes by code or location name, including office, hospital and telehealth settings.
Look up a POS code →Medical Billing Field Lookup
Search CMS-1500 boxes, UB-04 form locators and common billing terms from one reference tool.
Search fields →CMS-1500 vs UB-04 Selector
Answer two questions to identify the likely professional or institutional paper/electronic claim format.
Choose a form →Patient Responsibility Calculator
Estimate deductible, copay, coinsurance, insurer payment and contractual adjustment with a transparent calculation.
Open free tool →Medicare PFS Calculator
Estimate a Medicare Physician Fee Schedule payment from RVUs, GPCIs and the 2026 conversion factor.
Open free tool →Claim Timely Filing Calculator
Calculate a Medicare one-calendar-year deadline or a custom payer filing period and see days remaining.
Open free tool →Why these tools are useful
Medical billing work often involves more than typing a claim. Staff need to catch obvious claim errors, estimate what a patient may owe, understand Medicare payment math, watch payer deadlines and inspect electronic claim files. These tools bring those common tasks together in one place.
Privacy-first browser tools
The CMS-1500 checker and 837P viewer are designed to perform their work in your browser. No account is required. For protected health information, always follow your organization’s privacy and security procedures and verify payer-specific requirements before filing.
Need to create an electronic professional claim?
CMS-1500 Electronic Claim Software creates 837P Version 5010A1 files for $249/year for 1 computer. The program creates the file; submission is handled separately through your payer or clearinghouse workflow.