I am a PADI DM and in addition to what the others have said, you need yearly medical and need to stay current on your EFR Cert..
PADI does not require an annual medical, nor current EFR, to retain active status as a DM. It is a good idea, of course, but not required.
Whatever shop you might be working for (and possibly getting insurance from) might require the medical/EFR, but that is their requirement, not PADI's. Ref: 2015 Instructor Manual, p.134.