ICD-10 code for thyroiditis

The ICD-10-CM code for thyroiditis is E06.9 (Thyroiditis, unspecified). The official index lists 30 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on E06.9.

Within E06, choose E06.9 (unspecified) only when documentation doesn't support a more specific option: acute thyroiditis (E06.0), subacute thyroiditis (E06.1), chronic thyroiditis with transient thyrotoxicosis (E06.2), autoimmune thyroiditis (E06.3), drug-induced thyroiditis (E06.4) and other chronic thyroiditis (E06.5).

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 011 (Tracheostomy for Face, Mouth and Neck Diagnoses or Laryngectomy with MCC, relative weight 5.6154), DRG 012 (Tracheostomy for Face, Mouth and Neck Diagnoses or Laryngectomy with CC, relative weight 4.381), DRG 013 (Tracheostomy for Face, Mouth and Neck Diagnoses or Laryngectomy without CC/MCC, relative weight 2.7307), 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 Pre-MDC and 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.