2026 ICD-10-CM Diagnosis Code D34Benign neoplasm of thyroid gland
ICD-10-CM Codes›C00–D49›D10-D36›D34
- Billable — Valid for Submission
- Not Chronic
D34 is a billable ICD-10-CM diagnosis code for benign neoplasm of thyroid gland. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 643 through 645. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Benign neoplasms.
Code Identity
Code Classification
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
- Neoplasm of thyroglossal duct
- Thyroid adenoma
- Thyroid follicular adenoma
- Thyrotoxicosis due to toxic thyroid adenoma
- Toxic thyroid adenoma
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Use Additional Code
- code to identify any functional activity
The “use additional code” indicates that a secondary code could be used to further specify the patient’s condition. This note is not mandatory and is only used if enough information is available to assign an additional code.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
- Adenoma - See Also: Neoplasm, benign, by site;
- colloid
- unspecified site - D34
- fetal
- unspecified site - D34
- unspecified site - D34
- Hurthle cell - D34
- unspecified site - D34
- unspecified site - D34
- Tumor - See Also: Neoplasm, unspecified behavior, by site;
- Hurthle cell (benign) - D34
External Cause of Injuries IndexGuidance
References for this code in the External Cause of Injuries Index.
- Adenoma
- colloid
- unspecified site
- Adenoma
- fetal
- unspecified site
- Adenoma
- follicular
- unspecified site
- Adenoma
- Hurthle cell
- Adenoma
- macrofollicular
- unspecified site
- Adenoma
- microfollicular
- unspecified site
- Hurthle cell
- adenoma
- Hurthle cell
- tumor
- Tumor
- Hurthle cell (benign)
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Table of NeoplasmsClinical
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.
Code HistoryHistory
Questions About D34Overview
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, 2025 through September 30, 2026.
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 643, 644, 645, with relative weights from 0.7683 to 1.6461 depending on complications. Higher weights mean higher Medicare reimbursement.
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.
Footnotes
[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.
