Texas Subscriber
Answer: Your suspicion is warranted: 357.3 is only reportable with the primary diagnosis codes that indicate malignant neoplasms and leukemia. Because AIDS is not a malignant disease, you should report 042 (Human immunodeficiency virus [HIV] disease), followed by 357.4 (Polyneuropathy in other diseases classified elsewhere).
Although coders might think they should list 357.4 as the primary diagnosis because the physiatrist is actually treating the polyneuropathy and not the HIV, they shouldn't. A note in ICD-9 following 357.4 instructs coders to "code first underlying disease."