Although he recorded a verdict 86-year-old Minnie White died as a result of natural causes, he said the hospital's failure to provide nourishment and basic medical attention had amounted to neglect.
Mrs White was initially admitted to the hospital on January 17 this year for treatment to a leg injury sustained while she was on her scooter.
She was discharged on the same day but had to be readmitted almost immediately after collapsing at home.
Evidence from her daughter, Pauline Mack, and from consultant geriatrician Christopher Cook revealed from her readmision up until her death on February 11, she had suffered diarrhoea and ulcerative colitis.
Along with two other elderly hospital parients at the same time, this had been as a result of having contracted the potentially fatal bug known as Clostridium difficile - C diff.
There was no significant abatement of the distressing condition, and it fell to Mrs Mack to wash her mother's soiled nightwear.
Dr Cook acknowledged his patient's condition worsened because of inappropriate medication and a failure to consider putting her on a drip when when she became undernourished and dehydrated.
The Coroner heard nurses and junior doctors failed to keep charts monitoring Mrs White's condition and their communication with Dr Cook had been unsatisfactory.
Another error was the decision to transfer Mrs White, of Robinson Avenue, Alford, temporarily to intermediate care at Skegness Hospital at a time when she was too poorly to travel.
Mrs Mack said her mother's bedside table at Louth had not been kept clean and ward hygiene had not been treated as a priority by medical staff.
In his summing up, the Coroner said it was not his role to aportion blame, but he described some of the lapses as 'inexcusable'.
He noted an assurance from Dr Cook that, since the tragedy, the head of nursing had been instructed to implement a 'shake up' of procedures.
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