Choosing ICD-10-CM Codes

Step 1: Look up the term for the diagnosis in the Alphabetic Index.

Diabetes, diabetic (mellitus) (sugar) E11.9
- type 1 E10.9
- - with
- - - nephropathy E10.21

The term includes a subterm indicating Type 1 diabetes with specific codes for diabetes-related conditions. The Alphabetic Index lists the code for Type 1 diabetes mellitus with diabetic nephropathy as E10.21. Next, verify this code in the Tabular List.

Step 2: Verify the code E10.21 in the Tabular List.

E10 Type 1 diabetes mellitus

E10.2 

Type 1 diabetes mellitus with kidney complications

E10.21 

Type 1 diabetes mellitus with diabetic nephropathy
Type 1 diabetes mellitus with intercapillary glomerulosclerosis
Type 1 diabetes mellitus with intracapillary glomerulonephrosis
Type 1 diabetes mellitus with Kimmelstiel-Wilson disease

The Tabular List shows code E10.21 for Type 1 diabetes mellitus with diabetic nephropathy.

Code Assignment for this Diagnosis: E10.21