Each ratings service uses a different scale to grade a provider's claims-paying ability. Here is a comparison of each service's scales to see how they compare to one another:
| A.M. Best | Duff & Phelps | Moody's | Standard & Poor's | Weiss | A++ | AAA | Aaa | AAA, AAApi* | A+ | A+ | AA+ | Aa1 | AA+ | A | A | AA | Aa2 | AA, AApi | A- | A- | AA- | Aa3 | AA- | B+ | B++ | A+ | A1 | A+ | B | B+ | A | A2 | A, Api | B- | B | A- | A3 | A- | C+ | B- | BBB+ | Baa1 | BBB+ | C | C++ | BBB | Baa2 | BBB, BBBpi | C- | C+ | BBB- | Baa3 | BBB- | D+ | C | BB+ | Ba1 | BB+ | D | C- | BB | Ba2 | BB, BBpi | D- | D | BB- | Ba3 | BB- | E+ | E | B+ | B1 | B+ | E | F | B | B2 | B, Bpi | E- | | B- | B3 | B- | F | | CCC | Caa1 | CCC, CCCpi | | | DD | Caa2 | R | | | | Caa3 | | | | | Ca | | | | | C | | | * The Standard & Poor's "pi" rating is based solely on public information. |
