ICD-10-CM 2027
ICD-10 code for Thyromegaly
From the official ICD-10-CM alphabetic index entry “Thyromegaly”. Page updated September 29, 2026.
About coding Thyromegaly
The ICD-10-CM code for Thyromegaly is E01.0 (Iodine-deficiency related diffuse (endemic) goiter).
Within E01 (iodine-deficiency related thyroid disorders and allied conditions), E01.0 is specifically for iodine-deficiency related diffuse (endemic) goiter. Related codes cover iodine-deficiency related multinodular (endemic) goiter (E01.1), iodine-deficiency related (endemic) goiter, unspecified (E01.2) and other iodine-deficiency related thyroid disorders and allied conditions (E01.8).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 643 (Endocrine Disorders with MCC, relative weight 1.6139), DRG 644 (Endocrine Disorders with CC, relative weight 1.0044) and DRG 645 (Endocrine Disorders without CC/MCC, relative weight 0.7459), in MDC 10 (Endocrine, Nutritional and Metabolic Diseases and Disorders), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
Common questions about Thyromegaly ICD-10 codes
What is the ICD-10 code for Thyromegaly?
- E01.0 — Iodine-deficiency related diffuse (endemic) goiter.
Is E01.0 billable?
- Yes. E01.0 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can E01.0 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict E01.0 as a principal diagnosis.
Is E01.0 a CC or MCC?
- No. E01.0 is neither a CC nor an MCC under MS-DRG v44.0.