MYSQL Update From within the same table using some condition

In Some cases, we need to update the table of one row with the values of the other row on the same table. Here is the query to do the same.

UPDATE patientinsurance dest
		JOIN ( SELECT 
				patientCode,
				policyNo
			FROM
				patientinsurance
			WHERE
				ID = 121590
			) AS source
			
			ON dest.patientCode = source.patientCode

SET dest.policyNo = source.policyNo
WHERE dest.id IN (121911)