
Also look for Long-term (current) (prophylactic) drug therapy (use of)/insulin which directs you to Z79.4. The severity of the ulcer is not provided.

Look in the Alphabetic Index for Ulcer/back which directs the coder to L98.429. In the Tabular List E11.622 has a note to use an additional code to identify the site of the ulcer. In the ICD-10-CM Alphabetic Index look for Diabetes, diabetic (mellitus) (sugar)/with/skin ulcer NEC which directs you to E11.622. For type 2 patients, code Z79.4 is reported to indicate long-term use of insulin. If the documentation indicates that the patient uses insulin but does not indicate the type of diabetes you report type 2. ICD-10-CM guideline I.C.4.a.3 indicates the use of insulin does not mean that a patient is a type 1 diabetic. Rationale: ICD-10-CM guideline I.C.4.a.2 indicates if the type of diabetes is not documented in the medical record the default type is 2.
