Data corrections, verification passes and site changes, newest first. Corrections reported by users are listed here as they are applied.
| Date | Area | Change |
|---|---|---|
| October 16, 2026 | Content | Published the methodology, comparison and changelog pages. Blog launched. |
| October 16, 2026 | Site | Sitemap now covers every prefix page; search moved server-side; plan and prefix pages cached for faster loading. Site name is PrefixLookup. |
| October 16, 2026 | Copy | Corrected "over 60 BCBS companies" to 33 independent companies operating 65 billing entities, and the filing-limit range to 90 days to 24 months. |
| October 16, 2026 | Data | Three prefix codes (FJB, FJF, FVI) had stray text in the code field; corrected. |
| August 2026 | Data | Full verification of all 260 billing values: 225 confirmed against quoted sources, 56 corrected, 32 marked unverified. |
| August 2026 | Data | 440 context-specific exceptions added (line of business, claim type, region, network status), shown under each headline value on plan pages. |
| August 2026 | Content | BlueCard guidance added to every plan page: file with your local Blue plan, appeals go to the local plan, the home plan decides benefits and medical policy. |
| August 2026 | Site | Plan pages now show verification status and source links. |
| June 29, 2026 | Content | Published: BlueCard Program: How Out-of-State BCBS Claims Work. |
| April 13, 2026 | Data | Launch dataset: 20,095 prefixes across 65 billing entities. |