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ICD-10-CM 2027

ICD-10 code for malignant goiter

C73

Malignant neoplasm of thyroid gland

✓ Billable / specific

From the official ICD-10-CM alphabetic index entry “Goiter (plunging) (substernal) › malignant”. Page updated September 29, 2026.

About coding malignant goiter

The ICD-10-CM code for malignant goiter is C73 (Malignant neoplasm of thyroid gland).

Use an additional code to identify any functional activity.

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.

Common questions about malignant goiter ICD-10 codes

What is the ICD-10 code for malignant goiter?

C73 — Malignant neoplasm of thyroid gland.

Is C73 billable?

Yes. C73 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can C73 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict C73 as a principal diagnosis.

Is C73 a CC or MCC?

No. C73 is neither a CC nor an MCC under MS-DRG v44.0.