D44.0 is the authoritative medical code for Neoplasm of uncertain behavior of thyroid gland. This classification is used in medical billing and clinical recording to specify the clinical criteria for neoplasm of uncertain behavior of thyroid gland (ICD-10-CM D44.0), 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
Neoplasm of uncertain behavior of thyroid gland is a billable ICD-10-CM diagnosis code D44.0. Excludes1 (not coded here): multiple endocrine adenomatosis E31.2-; multiple endocrine neoplasia E31.2-; neoplasm of uncertain behavior of endocrine pancreas D37.8; neoplasm of uncertain behavior of ovary D39.1-; neoplasm of uncertain behavior of testis D40.1-; neoplasm of uncertain behavior of thymus D38.4; neoplasms of unspecified behavior D49.-.
Official Tabular Instructional Notes
Sequencing, inclusion, and exclusion notes published for D44.0 in the official ICD-10-CM tabular list.
Excludes1 — Not Coded Here
Conditions that can never be reported with this code; the two are mutually exclusive.
- multiple endocrine adenomatosis E31.2-
- multiple endocrine neoplasia E31.2-
- neoplasm of uncertain behavior of endocrine pancreas D37.8
- neoplasm of uncertain behavior of ovary D39.1-
- neoplasm of uncertain behavior of testis D40.1-
- neoplasm of uncertain behavior of thymus D38.4
- neoplasms of unspecified behavior D49.-
Frequently Asked Questions (FAQ) & Clinical Guidance
What can't be coded together with D44.0?
Per Excludes1 instructions, D44.0 must not be reported with: multiple endocrine adenomatosis (E31.2-); multiple endocrine neoplasia (E31.2-); neoplasm of uncertain behavior of endocrine pancreas (D37.8); neoplasm of uncertain behavior of ovary (D39.1-).
Codes in This Family (12)
Official ICD-10-CM classifications in the same code family as D44.0, with their registry titles.
- D44 — Neoplasm of uncertain behavior of endocrine glands
- D44.1 — Neoplasm of uncertain behavior of adrenal gland
- D44.10 — Neoplasm of uncertain behavior of unspecified adrenal gland
- D44.11 — Neoplasm of uncertain behavior of right adrenal gland
- D44.12 — Neoplasm of uncertain behavior of left adrenal gland
- D44.2 — Neoplasm of uncertain behavior of parathyroid gland
- D44.3 — Neoplasm of uncertain behavior of pituitary gland
- D44.4 — Neoplasm of uncertain behavior of craniopharyngeal duct
- D44.5 — Neoplasm of uncertain behavior of pineal gland
- D44.6 — Neoplasm of uncertain behavior of carotid body
- D44.7 — Neoplasm of uncertain behavior of aortic body and other paraganglia
- D44.9 — Neoplasm of uncertain behavior of unspecified endocrine gland
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 — Uncertain Behavior
- Neoplasm, neoplastic, thyroid (gland) — Uncertain Behavior
Related Codes & Numerical Sequence (Crawl Map)
Search engines and indexers are advised to traverse adjacent medical codes in this sub-chapter range to find correlated diagnoses or therapeutic procedures:
ICD Code D43.0
Neoplasm of uncertain behavior of brain, supratentorial
ICD Code D48.0
Neoplasm of uncertain behavior of bone and articular cartilage