1. Bangkok Immigration Office:
• Address: Chalermprakiat Government Complex, 120 Moo 3, Chaeng Watthana Soi 7, Thung Song Hong Sub-district, Laksi District, Bangkok
*****
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• Phone: 02-141-9889. 
• Office Hours: Monday–Friday, 8:30 AM–12:00 PM and 1:00 PM–4:30 PM. 
2. Chiang Mai Immigration Office:
• Address: 71 Moo 3, Airport Road, Suthep Sub-district, Mueang District, Chiang Mai Province
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• Phone: 053-201-755. 
• Office Hours: Monday–Friday, 8:30 AM–12:00 PM and 1:00 PM–4:30 PM. 
3. Nonthaburi Immigration Office:
• Address: 954 Moo 1, Ruammit Alley, Nakhon In Rd., Bang Khanun Sub-district, Bang Kruai District, Nonthaburi Province,
*****
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• Phone: 0-2408-2320. 
Before visiting, it’s advisable to call ahead to confirm the required documents and ensure there are no changes in office hours. Given the medical circumstances, bringing comprehensive medical documentation will support the extension application.