How can one repent from incorrectly diagnosing patients due to incompetence, and what should be done with the money earned from it? Is it necessary to inform the patients or compensate them, knowing that a portion of the money was taken by the specialist?

If you strive to treat patients to the best of your knowledge, there is no sin upon you. However, if you fall short in treating one of them or cause them harm, you must return the money you took from them, without obliging them to disclose it. All unlawfully acquired money must be returned, whether you benefited from it yourself or gave it to your partner. For those rightful owners who cannot be reached, their money should be given in charity to the poor on their behalf. If you are unable to determine the exact amount, you should investigate and pay what you predominantly believe will clear your conscience.