Additions charged to costs and expenses

  
SCHEDULE IIAMGEN INC.VALUATION AND QUALIFYING ACCOUNTSYears ended December 31, 2021, 2020 and 2019 (In millions)

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| Allowance for doubtful accounts |  | Balanceat beginningof period |  | Additionscharged tocosts andexpenses |  | Otheradditions |  | Deductions |  | Balanceat endof period |
| Year ended December 31, 2021 |  | $ | 32  |  |  | $ | —  |  |  | $ | —  |  |  | $ | (6) |  |  | $ | 26  |  |
| Year ended December 31, 2020 |  | $ | 26  |  |  | $ | 8  |  |  | $ | —  |  |  | $ | (2) |  |  | $ | 32  |  |
| Year ended December 31, 2019 |  | $ | 48  |  |  | $ | —  |  |  | $ | —  |  |  | $ | (22) |  |  | $ | 26  |  |

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