Drug/chem diabetes mellitus w periodontal disease

This code signifies diabetes mellitus that has been caused by a drug or chemical, specifically when the patient also presents with periodontal disease. This is a secondary form of diabetes, distinct from Type 1 or Type 2, where the exogenous substance is the etiologic factor.

Apply this code when documentation clearly links the onset of diabetes to a prescribed medication or chemical exposure, and the patient has a co-occurring diagnosis of periodontal disease. This typically requires a physician's statement confirming the drug/chemical as the cause of the diabetes.

• Always sequence the drug/chemical as an external cause code (T36-T65) after this diabetes code, if known.
• Ensure documentation specifies "drug-induced" or "chemical-induced" diabetes; do not assume based on medication lists alone.
• Distinguish from diabetes due to underlying conditions (e.g., pancreatitis) or unspecified diabetes.