Vaccine was expired on 13-Aug-2022 and was was stored in refrigerator after expiration; No adverse event; Vaccine was expired on 13-Aug-2022 and was administered on 23-Aug-2022; Patient received second booster dose of 0.5ml; This spontaneous case was reported by an other health care professional and describes the occurrence of PRODUCT STORAGE ERROR (Vaccine was expired on 13-Aug-2022 and was was stored in refrigerator after expiration), EXPIRED PRODUCT ADMINISTERED (Vaccine was expired on 13-Aug-2022 and was administered on 23-Aug-2022), OVERDOSE (Patient received second booster dose of 0.5ml) and NO ADVERSE EVENT (No adverse event) in an 89-year-old patient of an unknown gender who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch no. 057M21A) for COVID-19 vaccination.     Previously administered products included for Product used for unknown indication: COVID-19 Vaccine (unspecified COVID-19 vaccine Dose 1), COVID-19 Vaccine (unspecified COVID-19 vaccine Dose 4, 1st Booster), COVID-19 Vaccine (unspecified COVID-19 vaccine Dose 3) and COVID-19 Vaccine (unspecified COVID-19 vaccine Dose 2). Past adverse reactions to the above products included No adverse event with COVID-19 Vaccine, COVID-19 Vaccine, COVID-19 Vaccine and COVID-19 Vaccine.    On 23-Aug-2022 at 11:36 AM, the patient received fifth dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) .5 milliliter. On 23-Aug-2022 at 11:36 AM, the patient experienced EXPIRED PRODUCT ADMINISTERED (Vaccine was expired on 13-Aug-2022 and was administered on 23-Aug-2022) and OVERDOSE (Patient received second booster dose of 0.5ml). On an unknown date, the patient experienced PRODUCT STORAGE ERROR (Vaccine was expired on 13-Aug-2022 and was was stored in refrigerator after expiration) and NO ADVERSE EVENT (No adverse event). At the time of the report, PRODUCT STORAGE ERROR (Vaccine was expired on 13-Aug-2022 and was was stored in refrigerator after expiration), EXPIRED PRODUCT ADMINISTERED (Vaccine was expired on 13-Aug-2022 and was administered on 23-Aug-2022), OVERDOSE (Patient received second booster dose of 0.5ml) and NO ADVERSE EVENT (No adverse event) outcome was unknown.        For mRNA-1273 (Moderna COVID-19 Vaccine) (Unknown), the reporter considered NO ADVERSE EVENT (No adverse event) to be not related. No further causality assessments were provided for PRODUCT STORAGE ERROR (Vaccine was expired on 13-Aug-2022 and was was stored in refrigerator after expiration), EXPIRED PRODUCT ADMINISTERED (Vaccine was expired on 13-Aug-2022 and was administered on 23-Aug-2022) and OVERDOSE (Patient received second booster dose of 0.5ml).    No concomitant medications were reported.   It was reported that patient received Second booster dose.  The vaccine was delivered and placed into the freezer on 18-Apr-2022. The vial size was reported as 5.5 ml. Vaccines were only offered on Tuesdays from Mar-2022 forward. For each Tuesday vaccine date, only one vial was removed from the freezer to place in the refrigerator the day before it was used (each Monday, one vial was removed from the freezer and placed into the refrigerator). Therefore, for administration on 30-Aug-2022 vial was placed into refrigerator on 29-Aug-2022. The vial did not undergo any temperature excursion.   No treatment details were reported.