Expired Vaccine used; This spontaneous case was reported by a health care professional and describes the occurrence of EXPIRED PRODUCT ADMINISTERED (Expired Vaccine used) in a 79-year-old male patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch nos. 038B21A, 038B21A and 003B21) for COVID-19 vaccination.     The patient's past medical history included Accident NOS (Accidental fall NOS), Hematoma NOS (Hematoma Scalp, Left frontal), Hematoma NOS (Hematoma, Right Knee), Weight loss, Dizziness, Hypoxemia, Vitamin D deficiency, Myalgia, Dyspnea, Chest discomfort, Rotator cuff tear (left), Gait disturbance, Hypoxemia (Hypoxemia Nocturnal), Fatigue, Vitamin B12 deficiency and Anticoagulant therapy. Previously administered products included for Product used for unknown indication: Vaccine Influenza (Series 2) on 10-May-2021 and Vaccine Influenza; for Immunization: Vaccine Influenza (Series 1) on 20-Sep-2021. Past adverse reactions to the above products included No adverse event with Vaccine Influenza, Vaccine Influenza and Vaccine Influenza. Concurrent medical conditions included Penicillin allergy (Critical), Allergy to antibiotic (Levaquin (Critical)), Iodine allergy, Drug allergy (Actos (Pioglitazone HCL Tabs) Moderate), Osteoarthritis shoulders (left shoulder), Central sleep apnea syndrome (Primary central sleep apnea), Sleep apnea (Sleep apnea, Obstructive severe), Restless leg syndrome, Sleep apnea, Cervical disc disease, Cervical radiculopathy, Hypomagnesemia, Diabetic peripheral neuropathy, Iron deficiency anemia, Rhinitis medicamentosa, Dyspepsia, Hypothyroidism, Iron deficiency, Colonic tubulovillous adenoma, Antral gastritis, Gastro intestinal bleeding, Hyperlipidemia (Mixed), Type 2 diabetes mellitus (Uncontrolled), Hypertension, GERD, Atrial fibrillation (Chronic), Pulmonary hypertension secondary (Chronic) and Obstructive sleep apnea syndrome. Concomitant products included CETIRIZINE HYDROCHLORIDE (ZYRTEC ALLERGY) and FLUTICASONE PROPIONATE (FLONASE ALLERGY RELIEF) for Allergy, HYDROCHLOROTHIAZIDE and LISINOPRIL for Blood pressure high, METFORMIN HCL for Diabetes, TRAZODONE for Sleep deficit, MULTIVITAMINS [VITAMINS NOS], METOPROLOL SUCCINATE, ACETYLSALICYLIC ACID (ASPIRIN 81), SERTRALINE HCL, COLECALCIFEROL (VITAMIN D [COLECALCIFEROL]), CYANOCOBALAMINE and LEVOTHYROXINE SODIUM for an unknown indication.   On 26-Apr-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) 1 dosage form. On 01-Jun-2021, received second dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) dosage was changed to 1 dosage form. On 12-Nov-2021, received third dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) dosage was changed to 1 dosage form. On 12-Nov-2021,  after starting mRNA-1273 (Moderna COVID-19 Vaccine), the patient experienced EXPIRED PRODUCT ADMINISTERED (Expired Vaccine used). On 12-Nov-2021, EXPIRED PRODUCT ADMINISTERED (Expired Vaccine used) had resolved.      DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): On an unknown date, Investigation: results not known (Inconclusive) Screening for prostate cancer. On an unknown date, Occult blood: positive (Positive) Positive. On an unknown date, Physical examination: results not known (Inconclusive) Results not known.     For mRNA-1273 (Moderna COVID-19 Vaccine) (Unknown), the reporter did not provide any causality assessments.   Patients lab test also includes Screening for Skin cancer, Screening for Colon cancer, Screening for Coronary artery disease.  Contour next monitor for blood glucose monitoring. Contour invitro monitoring strip to check the blood sugar level. Bayer microlet Lancets to check blood sugar level. No treatment details were provided.