Yes, you can do this on e-Tax.
https://www.e-tax.nta.go.jp/kojin.html
https://www.keisan.nta.go.jp/kyoutu/ky/sm/top#bsctrl
https://www.keisan.nta.go.jp/r3/syotoku ... =21#bbctrl
There's an English Guide to using the e-Tax site
https://www.nta.go.jp/taxes/shiraberu/s ... df/061.pdf
Send the list of all medical expenses
https://www.keisan.nta.go.jp/r3/syotoku ... =21#bbctrl
You can only Claim as a Deduction Medical Expenses over Y100,000
If you add all the Medical Expenses together and they come to less than Y100,000, you can't claim anything. Don't waste your time.
If you add all the Medical Expenses together and they come to more than Y100,000, you can claim the amount minus Y100,000 as a deduction.
e.g. If you add all the Medical Expenses together and they come to say Y120,000, you can claim Y120,000 minus Y100,000 = Y20,000 as a deduction.
Therefore you will achieve a Tax Saving of Y20,000 x (Marginal Tax Rate + Reconstruction Tax rate)
Income Tax Rates 総所得金額の合計、復興特別所得税、住民税の税率
Band Marginal Tax Rate National% Reconstruction% = Total% = Tax Saving
Under 1,949,000 5% 0.105% = 5.105% = Y1,021
1,950,000 3,299,000 10% 0.21% = 10.21% = Y2,042
3,300,000 6,949,000 20% 0.42% = 20.42% = Y4,084
6,950,000 8,999,000 23% 0.483% = 23.483% = Y4,656
9,000,000 17,999,000 33% 0.693% = 33.693% = Y6,738
18,000,000 39,999,000 40% 0.84% = 40.84% = Y8,168
Over 40,000,000 45% 0.945% = 45.945% = Y9,189
plus Y20,000 x 10% Residents' Tax Rate = Y2,000
So, if the amount is very small, you might want to consider whether it is worth your time to do all the typing into the spreadsheet and filing, etc..
Forms also available here:
https://www.nta.go.jp/taxes/shiraberu/s ... /ref1.xlsx
https://www.nta.go.jp/taxes/shiraberu/s ... f/ref1.pdf
https://www.nta.go.jp/taxes/shiraberu/s ... f/ref3.pdf
https://www.nta.go.jp/taxes/shiraberu/s ... ki/016.pdf
https://www.nta.go.jp/taxes/shiraberu/s ... f/ref4.pdf
You need to keep all the Receipts for 5 years, in case they want to inspect them.