Osteoarthritis

“As a general question, I am wondering if a physician documents that the patient has had symptoms for longer than a year and has failed conservative/other treatment, can this problem be considered as “chronic with exacerbation/progression”? I am referring to the verbiage in the CPT book (page 13, under Stable, chronic illness) regarding the expected duration of at least 1 year and am wondering if it is applicable in this scenario. Also, I know that a diagnosis of osteoarthritis is inherently considered “chronic”, but I am wondering if there are other diagnoses that can be considered ‘chronic’, as well?”