Everything you look up.
Plus the date we checked it.
Free reference tools for the people who bill it, code it, and credential it. Every dataset comes straight from CMS, and every page shows exactly when we imported it.
Tools you can use today
No account, no trial, no card. Open one and start looking things up.
NPI Lookup
9,374,954 providersSearch any US provider or organization by NPI, name, state or specialty. Deactivated records stay visible and marked.
Open toolHCPCS Level II
7,448 codesDurable medical equipment, drugs, supplies and transport codes. Retired codes kept and flagged, never deleted.
Open toolHCPCS Modifiers
364 modifiersThe two-character modifiers that change how a code is paid. From the same CMS quarterly release.
Open toolPlace of Service
51 codesBox 24B on the CMS-1500. Drives facility versus non-facility reimbursement, so the wrong code is a denial.
Open toolSequestration Calculator
CO-253Medicare’s 2 percent cut, worked through any claim line in Medicare’s order, with the remittance lines it produces.
Open toolTimely Filing Calculator
CO-29Pick the payer and the date of service. Get the last day to file, correct and appeal, counted the way that payer counts.
Open toolHow we keep this correct
Every number on this site carries a source link and a date. Not a vague promise that we are always up to date.
We import each dataset directly from the body that publishes it, and stamp the page with the day we pulled it. When something is past its update window, the site says so in amber rather than quietly serving stale information.
Retired codes and deactivated NPIs stay visible and marked. Someone searching for a code they used last year needs to know what happened to it. A blank page answers nothing.
No competitor shows you this. Their data goes stale too. They just do not say so.
Latest guides
Denials, timely filing, modifiers and credentialing, explained for the people who work the claims.
Aetna Timely Filing Limit: 12 Months Out of Network, Your Contract In Network
Aetna gives out of network providers 12 months to file medical claims. In network, its provider manual points to your agreement...
Cigna Timely Filing Limit: 90 Days, Even for Corrected Claims
Cigna Healthcare gives participating providers 90 days after the date of service to file a claim, and out of network providers...
CO-253: The 2 Percent Medicare Sequestration Cut, Worked Through
CO-253 isn’t a denial. It’s Medicare’s 2 percent sequestration cut, taken from Medicare’s payment after the deductible and...
Optum Behavioral Health Timely Filing: Two Clocks, Both 90 Days
Optum Behavioral Health runs two 90 day clocks. Claims must reach Optum within 90 days of the date of service, but corrections run...
Credential Modifiers by License: LCSW, LPC, LMFT, PhD and PsyD
There is no national credential modifier for an LCSW, LPC or LMFT. CMS defines degree levels and two licenses, and Medicare...
UMR Timely Filing Limits: Why the Employer’s Plan Sets the Clock
UMR does not publish a timely filing limit, because UMR is not an insurer. It runs claims for employers that fund their own plans...
Start with the NPI lookup
Every US provider and organization, searchable by number, name, state or specialty. Free, and no account required.