AHA Coding Clinic® for ICD-9 - 2013 Issue 3; Ask the Editor
Diabetes Mellitus Type 1.5
A patient was admitted with ketoacidosis, and the attending physician documented that he was unable to determine whether the patient had type 1 or type 1.5 diabetes. We have received advice that if the physician does not indicate whether the diabetes is type 1 or type 2, it should be classified to 250.00, Diabetes mellitus without mention of complication, type II or unspecified type, not stated as uncontrolled, for diabetes type 1.5. The endocrinologists at our facility believe that, lacking a specific diagnostic code for type 1.5, it is more appropriate to code type 1.5 as type 1, because the patient “clearly is not type 2, and the patient does not have an autoimmune component to their diabetes.” What is the appropriate code assignment for type 1.5 diabetes? ...
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Article Overview
This article addresses a diabetes coding question involving type 1.5 diabetes and ambiguous physician documentation. It is aimed at coders, billers, and clinical documentation staff who need to understand how this topic is discussed in relation to ICD-9-CM category selection and physician documentation specificity. The content focuses on the coding issue, the clinical documentation context, and the implications of using a nonspecific diabetes classification when a specific type is not documented.
Why This Topic Matters
Accurate diabetes classification affects data quality, reporting, and downstream coding consistency. This topic is important when documentation is incomplete or when a condition is discussed by clinicians using terminology that does not map neatly to an official code set.
What You Will Learn
- How the article frames diabetes type 1.5 in relation to coding classification
- Why physician documentation specificity matters for diabetes coding
- What general coding issue arises when an official code does not directly name a documented diabetes subtype
- How the article situates the question within ICD-9-CM terminology
Who Should Read This
- Medical coders
- Coding auditors
- Clinical documentation improvement specialists
- Revenue cycle staff
- Endocrinology practice staff
Codes Discussed
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