LodgeiT will calculate Medicare Levy Surcharge (prefill+other info), make sure that you have activated "Medicare" via financial image.
It is important to use the correct tax code for your private health otherwise the tax calculations made by LodgeiT may be different than what you would expect.
Find the summary via "Estimate" tab-
How LodgeiT Calculates Medicare Levy Surcharge (MLS)?
-> It depends on Person’s taxable income, superannuation contributions, number of depended children, Number of days not liable for surcharge and also from spouse’s taxable income and superannuation contributions.
Visit this link to know more more about ATO codings -