C73 is the authoritative medical code for Malignant neoplasm of thyroid gland. This classification is used in medical billing and clinical recording to specify the clinical criteria for malignant neoplasm of thyroid gland (ICD-10-CM C73), ensuring healthcare documentation aligns with 2026 federal coding standards.
Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.
Official Registry Overview & Definition
Malignant neoplasm of thyroid gland is a billable ICD-10-CM diagnosis code C73. Use additional code: code to identify any functional activity.
Official Tabular Instructional Notes
Sequencing, inclusion, and exclusion notes published for C73 in the official ICD-10-CM tabular list.
Use Additional Code
Supplementary codes the tabular list directs you to add.
- code to identify any functional activity
Frequently Asked Questions (FAQ) & Clinical Guidance
Is an additional code needed with C73?
Use additional code(s) to specify: code to identify any functional activity.
Nearest Codes in This Family
Official ICD-10-CM classifications closest to C73 in its code family, with their registry titles.
- C73-C75 — Malignant neoplasms of thyroid and other endocrine glands (C73-C75)
Indexed Clinical Terms (30)
Clinical term phrases from the official ICD-10-CM Index to Diseases and Injuries that map to this code.
- Adenocarcinoma, follicular, moderately differentiated
- Adenocarcinoma, follicular, trabecular
- Adenocarcinoma, follicular, unspecified site
- Adenocarcinoma, follicular, well differentiated
- Adenocarcinoma, follicular, with papillary
- Adenocarcinoma, Hurthle cell
- Adenocarcinoma, nonencapsulated sclerosing
- Adenocarcinoma, papillary, follicular variant
- Adenocarcinoma, papillary, with follicular
- Carcinoma (malignant), C cell, unspecified site
- Carcinoma (malignant), follicular, moderately differentiated
- Carcinoma (malignant), follicular, pure follicle
- Carcinoma (malignant), follicular, trabecular
- Carcinoma (malignant), follicular, unspecified site
- Carcinoma (malignant), follicular, well differentiated
- Carcinoma (malignant), follicular, with papillary (mixed)
- Carcinoma (malignant), Hurthle cell
- Carcinoma (malignant), medullary, with, amyloid stroma, unspecified site
- Carcinoma (malignant), nonencapsulated sclerosing
- Carcinoma (malignant), papillary, follicular variant
- Carcinoma (malignant), papillary, with follicular (mixed)
- Carcinoma (malignant), parafollicular cell, unspecified site
- Carcinoma (malignant), solid, with amyloid stroma, unspecified site
- Goiter (plunging) (substernal), cancerous
- Goiter (plunging) (substernal), malignant
- Hurthle cell, adenocarcinoma
- Hurthle cell, carcinoma
- Tumor, Hurthle cell (benign), malignant
- Tumor, nonencapsulated sclerosing
- Wuchernde Struma Langhans
Neoplasm Table Sites (2)
Anatomical sites from the official ICD-10-CM Table of Neoplasms that map to this code, with the matching behavior column.
- Neoplasm, neoplastic, thyroglossal duct — Malignant, Primary
- Neoplasm, neoplastic, thyroid (gland) — Malignant, Primary