AHA Coding Clinic® for ICD-9 - 2004 Issue 2; Clarifications

Insulin Dependent Diabetes Mellitus (IDDM)

We need clarification regarding the appropriate way to code a diagnosis stated only as “insulin dependent diabetes mellitus.” The physician does not state whether the patient is a Type I or Type II diabetic. Some of our coders feel that the fifth digit of “1,” Diabetes mellitus, type I [insulin dependent type][IDDM][juvenile type], not stated as uncontrolled, should be assigned because IDDM is a nonessential modifier for this fifth digit in the Tabular List of Diseases. How should a diagnosis of IDDM be coded when the specific type is not documented? ...

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