E02 — Subclinical iodine-deficiency hypothyroidism
Is E02 billable?
Yes — E02 is billable for FY2027. E02 is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. E02 may be submitted for encounters from October 1, 2026 through September 30, 2027.
E02 at a glance
| Code | E02 |
|---|---|
| Description | Subclinical iodine-deficiency hypothyroidism |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Which MS-DRGs does E02 group to?
E02 sits in MDC 10 and helps define the logic of 3 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.
- 643Endocrine Disorders with MCCmedical
- 644Endocrine Disorders with CCmedical
- 645Endocrine Disorders without CC/MCCmedical
How is E02 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to E02. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Hypothyroidism › subclinical, iodine-deficiency related (acquired)
- Hypothyroidism › iodine-deficiency › subclinical (acquired)
- Hypothyroidism › due to › iodine-deficiency, acquired › subclinical (acquired)
Excludes1 — never code together — inherited from Chapter 4
The conditions below can never be reported together with E02 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
- transitory endocrine and metabolic disorders specific to newborn (P70-P74)
How long has E02 existed?
E02 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.
Which codes are confused with E02?
ICD-10-CM declares these codes mutually exclusive with E02 — exactly one of each pair can be correct for a given encounter.