As the previous poster wrote, there is a great need for coders, especially experienced ones. AHIMA is not the only group that have certifications. The AAPC (American Academy of Professional Coders) and the BMSC (Board of Medical Specialty Coding) also offers various coding credentials. You can check the websites out:
http://www.aapc.com/ and
http://www.medicalspecialtycoding.com/.
The board is the one that offers a coding credential specific to home health. AHIMA is the oldest association for what is known as health information management.
Coding focuses on accuracy with data intake and management. Coding just doesn't encompass the act of coding itself but takes into account reimbursement and analysis. Coding is also not only important for reimbursement purposes but for morbidity and mortality statistics. I definitely recommend that you pursue some type of coding credential to increase your knowledge and marketability. You may want to pursue a general coding certification like the CCS (AHIMA) or CPC-H (AAPC) over the HCS-D which is the home care coding credential.