E01 vs E02
E01 and E02 can never be reported together. ICD-10-CM declares them mutually exclusive with an Excludes1 note, meaning the two conditions cannot occur in the same patient — so exactly one of them is correct for any given encounter.
The official note, declared on E01
subclinical iodine-deficiency hypothyroidism (E02)
E01
Iodine-deficiency related thyroid disorders and allied conditions
Not billable
- Chapter 4
- Endocrine, nutritional and metabolic diseases
- Section
- E00-E07
E02
Subclinical iodine-deficiency hypothyroidism
Billable
- Chapter 4
- Endocrine, nutritional and metabolic diseases
- Section
- E00-E07
Indexed under
- Hypothyroidism › subclinical, iodine-deficiency related (acquired)
- Hypothyroidism › iodine-deficiency › subclinical (acquired)
- Hypothyroidism › due to › iodine-deficiency, acquired › subclinical (acquired)
Excludes1 is not always absolute: where two conditions covered by the note are genuinely unrelated, CMS guidance permits reporting both. Document the reasoning rather than assuming it. More on Excludes1 vs Excludes2 · FY2027