2027 ICD-10-CM Diagnosis Code D44Neoplasm of uncertain behavior of endocrine glands

ICD-10-CM Codes›C00–D49›D37-D48›D44

ICD-10-CM D44
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

D44 is a non-billable ICD-10-CM category code for neoplasm of uncertain behavior of endocrine glands, so it cannot be submitted on claims. Use a more specific code from this category instead, such as D44.0, D44.10, D44.11, and D44.12.

Code Identity

ICD-10-CM Code
D44
Billable Status
No — Non-Billable Category
Code Describes
Neoplasm of uncertain behavior of endocrine glands
Short Description
Neoplasm of uncertain behavior of endocrine glands
Same as the full description in the CMS dataset.
Chapter
D37-D48
Neoplasms of uncertain behavior, polycythemia vera and myelodysplastic syndromes

Code Classification

ChapterC00–D49Neoplasms
SectionD37-D48Neoplasms of uncertain behavior, polycythemia vera and myelodysplastic syndromes
CategoryD44Neoplasm of uncertain behavior of endocrine glands
This CodeD44Neoplasm of uncertain behavior of endocrine glands

Specific Coding for Neoplasm of uncertain behavior of endocrine glandsOverview

Non-specific codes like D44 require more characters. Use one of these billable codes instead:

  • Use D44.0 for Neoplasm of uncertain behavior of thyroid gland

  • D44.1 for Neoplasm of uncertain behavior of adrenal gland

  • Use D44.10 for Neoplasm of uncertain behavior of unspecified adrenal gland

  • Use D44.11 for Neoplasm of uncertain behavior of right adrenal gland

  • Use D44.12 for Neoplasm of uncertain behavior of left adrenal gland

  • Use D44.2 for Neoplasm of uncertain behavior of parathyroid gland

  • Use D44.3 for Neoplasm of uncertain behavior of pituitary gland

  • Use D44.4 for Neoplasm of uncertain behavior of craniopharyngeal duct

  • Use D44.5 for Neoplasm of uncertain behavior of pineal gland

  • Use D44.6 for Neoplasm of uncertain behavior of carotid body

  • Use D44.7 for Neoplasm of uncertain behavior of aortic body and other paraganglia

  • Use D44.9 for Neoplasm of uncertain behavior of unspecified endocrine gland

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to D44: its own notes plus those printed at block D37-D48 and Chapter 2. A note printed at a category, block or chapter applies to every code under it.

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

On D44 itself
  • 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)
From Block D37-D48 Neoplasms of uncertain behavior, polycythemia vera and myelodysplastic syndromes applies to 137 codes
  • neoplasms of unspecified behavior (D49.-)

Notes

General instructions on how these codes are used.

From Block D37-D48 Neoplasms of uncertain behavior, polycythemia vera and myelodysplastic syndromes applies to 137 codes
  • Categories D37-D44, and D48 classify by site neoplasms of uncertain behavior, i.e., histologic confirmation whether the neoplasm is malignant or benign cannot be made.
From Chapter 2 (C00-D49) Neoplasms applies to 1,730 codes
  • Functional activity
  • All neoplasms are classified in this chapter, whether they are functionally active or not. An additional code from Chapter 4 may be used, to identify functional activity associated with any neoplasm.
  • Morphology [Histology]
  • Chapter 2 classifies neoplasms primarily by site (topography), with broad groupings for behavior, malignant, in situ, benign, etc. The Table of Neoplasms should be used to identify the correct topography code. In a few cases, such as for malignant melanoma and certain neuroendocrine tumors, the morphology (histologic type) is included in the category and codes.
  • Primary malignant neoplasms overlapping site boundaries
  • A primary malignant neoplasm that overlaps two or more contiguous (next to each other) sites should be classified to the subcategory/code .8 ('overlapping lesion'), unless the combination is specifically indexed elsewhere. For multiple neoplasms of the same site that are not contiguous, such as tumors in different quadrants of the same breast, codes for each site should be assigned.
  • Malignant neoplasm of ectopic tissue
  • Malignant neoplasms of ectopic tissue are to be coded to the site mentioned, e.g., ectopic pancreatic malignant neoplasms are coded to pancreas, unspecified (C25.9).

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name D44, its category, or a range that includes it.

Excludes2 1

These codes carry an Excludes2 note naming D44: its condition is not part of those codes, and both may be reported when the patient has both.

  • D49 Neoplasms of unspecified behavior
    neoplasms of uncertain behavior (D37-D44, D48) names D37-D44, which includes this code

Notes 1

These notes mention D44.

  • Block D37-D48 Neoplasms of uncertain behavior, polycythemia vera and myelodysplastic syndromes
    Categories D37-D44, and D48 classify by site neoplasms of uncertain behavior, i.e., histologic confirmation whether the neoplasm is malignant or benign cannot be made. names D37-D44, which includes this code

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

Patient EducationClinical

Endocrine Diseases

Your endocrine system includes eight major glands throughout your body. These glands make hormones. Hormones are chemical messengers. They travel through your bloodstream to tissues or organs. Hormones work slowly and affect body processes from head to toe. These include:

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About D44Overview

What is the ICD-10 code for neoplasm of uncertain behavior of endocrine glands?

D44 is the ICD-10-CM category for neoplasm of uncertain behavior of endocrine glands, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

Is D44 (Neoplasm of uncertain behavior of endocrine glands) a billable code?

No. This is a category header that groups the codes for neoplasm of uncertain behavior of endocrine glands, and headers cannot be submitted on claims. Claims for neoplasm of uncertain behavior of endocrine glands need a more specific code from this category, such as D44.0, D44.10, and D44.11.

Can D44 be reported with a code from E31.2?

Not as a rule. The Excludes1 note on D44 lists "multiple endocrine adenomatosis (E31.2-)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).