Final answer:
In ICD-10, when the type of diabetes is not documented and the practitioner cannot be questioned, the code to be used is the code for diabetes (E11.9).
Step-by-step explanation:
In ICD-10, when the type of diabetes is not documented in the medical record and the practitioner cannot be questioned, the code to be used is the code for diabetes. The ICD-10 code for diabetes is E11.9 for unspecified type of diabetes mellitus. This code is used to indicate that the type of diabetes is not specified or documented in the medical record.