C73 — Malignant neoplasm of thyroid gland
C73 is a billable, specific ICD-10-CM code for malignant neoplasm of thyroid gland. It is valid for submission on a claim.
Use additional code
Add a secondary code to capture the detail described below.
- code to identify any functional activity
Other codes that can never be billed with C73
These codes carry an Excludes1 note pointing at C73. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading C73 alone.
- C75Malignant neoplasm of other endocrine glands and related structures
Risk adjustment
C73 risk-adjusts. Under the CMS-HCC V28 model it maps to this category:
- HCC 23 Prostate, Breast, and Other Cancers and Tumors0.186 RAF
Coefficient shown for the Community Non-dual Aged segment. A higher HCC in the same hierarchy will suppress this one, so capturing it does not always add score.
Medicare coverage
C73 is named in 74 Medicare coverage policies — 74 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
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How C73 is indexed
Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to C73.
- Wuchernde Struma Langhans
- Adenocarcinoma›Hurthle cell
- Adenocarcinoma›nonencapsulated sclerosing
- Carcinoma›Hurthle cell
- Carcinoma›nonencapsulated sclerosing
- Goiter›cancerous
- Goiter›malignant
- Hurthle cell›adenocarcinoma
- Hurthle cell›carcinoma
- Tumor›nonencapsulated sclerosing
- Adenocarcinoma›follicular›moderately differentiated
- Adenocarcinoma›follicular›trabecular
Questions about C73
- Is C73 a billable ICD-10-CM code?
- Yes. C73 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does C73 sit in the tabular list?
- Neoplasms (C00-D49), in the block Malignant neoplasms of thyroid and other endocrine glands (C73-C75).