Lymphoid leukemia, unspecified, in relapse

This code signifies a diagnosis of lymphoid leukemia where the specific type (e.g., acute, chronic, B-cell, T-cell) has not been documented, and the disease has recurred or progressed after a period of remission. It indicates an active, unspecified lymphoid malignancy that is no longer in remission.

Apply this code when documentation clearly states "lymphoid leukemia in relapse" without further specification of the leukemia type. This is appropriate for patients undergoing treatment for recurrent or progressive lymphoid leukemia after an initial period of remission. Supporting documentation includes physician notes, pathology reports, and treatment plans confirming relapse and lack of further specificity.

• Do not use this code if the specific type of lymphoid leukemia (e.g., ALL, CLL) is documented; instead, use the more specific code for that type in relapse.
• Always sequence this code after any underlying or primary malignancy if applicable, though lymphoid leukemias are often primary diagnoses.
• Ensure documentation explicitly states "in relapse" to justify the fifth character "2"; otherwise, a code for "not in remission" or "in remission" might be more appropriate.