You should be using all the codes and try to use the new CCM (chronic care management) code as well. This is your best bet at this time for getting paid for non face-to-face services
G0180 -- Initial certification of Home Health form: This is simply reviewing, attesting, and signing off on the home health form. There is no reason you should not be charging for this
G0179 -- Recertification of Home Health: This is same as above on a recertification form after the initial 60 day certification as expired
G0181 -- Care plan oversight: This is billed when you spend 30 minutes or more on the phone with home health, reviewing labs, coordinating care, etc. It is only for patients enrolled in home health services. You do need to have a little tally sheet handy for keeping track of the minutes. However, if you keep track (think like a lawyer!) then you can bill
G0182 -- This is same as G0181 but for a hospice patient. You will need to use a GV or GW modifier for this code provided you are not under a payment contract with the hospice (if you are, you cannot bill separately for this service)
99495 -- Transitional care management moderate (TCM): Everyone should bill for these when a medicare patient leaves the hospital or nursing home. There needs to be a phone call from your staff to the patient within 48 hours and a follow up within 14 days. The bill is submitted 31 days after the discharge. This extra work garners the equivalent of an additional level 3 visit on top of your regular charge.
99496 -- TCM code high: Same as above but higher acuity so patient needs to be seen within 7 days of discharge. Garners about an extra level 4 payment for this work.
Chronic Care Management codes (CCM) -- if you can achieve all the components of this, you can get paid about $42 for any time you or your staff spends 20 minutes on the phone or otherwise coordinating care. Requirements are moderately difficult, especially the requirement that care plans must be created and shared electronically. More information is available in this excellent article in ACP Internist
http://www.acpinternist.org/archives/2015/01/coding.htm