2027 ICD-10-CM Diagnosis Code D34Benign neoplasm of thyroid gland

ICD-10-CM Codes›C00–D49›D10-D36›D34

ICD-10-CM D34
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

D34 is a billable ICD-10-CM diagnosis code for benign neoplasm of thyroid gland. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 11 through 13, 643 through 645. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Benign neoplasms.

Code Identity

ICD-10-CM Code
D34
Billable Status
Yes — Valid for Submission
Code Describes
Benign neoplasm of thyroid gland
Short Description
Benign neoplasm of thyroid gland
Same as the full description in the CMS dataset.
Chapter
D10-D36
Benign neoplasms, except benign neuroendocrine tumors

Code Classification

ChapterC00–D49Neoplasms
SectionD10-D36Benign neoplasms, except benign neuroendocrine tumors
CategoryD34Benign neoplasm of thyroid gland
This CodeD34Benign neoplasm of thyroid gland

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Benign neoplasm of thyroglossal duct
  • Benign neoplasm of thyroid gland
  • Follicular adenoma of ectopic thyroid tissue
  • Follicular neoplasm of thyroid
  • Follicular thyroid adenoma with papillary architecture
  • Neoplasm of thyroglossal duct
  • Oncocytic adenoma of thyroid
  • Thyroid adenoma
  • Thyroid follicular adenoma
  • Thyrotoxicosis due to toxic thyroid adenoma
  • Toxic thyroid adenoma

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to D34: its own notes plus those printed at Chapter 2. A note printed at a category, block or chapter applies to every code under it.

Use Additional Code

Add a second code, after this one, to fully describe the condition.

  • code to identify any functional activity

Notes

General instructions on how these codes are used.

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.

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR NEO073
Benign neoplasms
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Benign Thyroid Gland Neoplasm

    a neoplasm that arises from the thyroid gland and is characterized by the absence of atypical or malignant cytological and architectural features, and absence of invasive features or metastatic potential.

Table of NeoplasmsClinical

Anatomical sites in the Table of Neoplasms that reference this code family.

SiteMalig.
Primary		Malig.
Secondary		Ca
in situ		BenignUncertainUnspec.
thyroglossal ductC73C79.89D09.3D34D44.0D49.7
thyroid (gland)C73C79.89D09.3D34D44.0D49.7

Patient EducationClinical

Benign Tumors

Tumors are abnormal growths in your body. They can be either benign or malignant. Benign tumors aren't cancer. Malignant ones are. Benign tumors grow only in one place. They cannot spread or invade other parts of your body. Even so, they can be dangerous if they press on vital organs, such as your brain.

Read the full article at MedlinePlus

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

Convert D34 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
226 Benign neoplasm thyroid
Exact Match The mapping is direct, with no qualifiers.

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 D34Overview

What is the ICD-10 code for benign neoplasm of thyroid gland?

The ICD-10-CM code for benign neoplasm of thyroid gland is D34. It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is D34 (Benign neoplasm of thyroid gland) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report benign neoplasm of thyroid gland on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does D34 group to?

When benign neoplasm of thyroid gland is the principal diagnosis on an inpatient stay, it groups to MS-DRG 12, 644, 645, 11, 13, 643, with relative weights from 0.7461 to 5.6129 depending on complications. Higher weights mean higher Medicare reimbursement.

Does D34 need an additional code?

When the condition applies, yes. The Use Additional Code note reads: code to identify any functional activity. The additional code is reported after D34.

What is the ICD-9 equivalent of D34?

Under the General Equivalence Mappings, benign neoplasm of thyroid gland converts to ICD-9-CM 226 (benign neoplasm thyroid). The mapping is a direct match.