As per latest announcement made by icai somwhere in the month of may/june on the said issue, ICAI has clearified that in the first year of articleship no permission is requiried for taking transfer as directly Form no 109 can be submitted once it has been signed by the relevant principle and will be accepted by ICAI.
In subsequent year First a letter need to send to ICAI requesting for their approval for transfer as only if the reason specified by the applicant in application is permissible by ICAI then only can submit Form 109 for transfer otherwsie it will will be rejectedBy ICAI.
In the given case in ma view medical reason is a permissible reason and i think ICAI will allow transfer even in if it is a case of subsequent year subject to proving of the said medical reasons by submitting the various doctors certificate in this matter as ICAI may require.