2026 ICD-10-CM Diagnosis Code E06.0Acute thyroiditis

ICD-10-CM Codes›E00–E89›E00-E07›E06

ICD-10-CM E06.0
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

E06.0 is a billable ICD-10-CM diagnosis code for acute thyroiditis. 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 Thyroid disorders.

Code Identity

ICD-10-CM Code
E06.0
Billable Status
Yes — Valid for Submission
Code Describes
Acute thyroiditis
Short Description
Acute thyroiditis
Same as the full description in the CMS dataset.
Parent Code
E06
Thyroiditis

Code Classification

ChapterE00–E89Endocrine, nutritional and metabolic diseases
SectionE00-E07Disorders of thyroid gland
CategoryE06Thyroiditis
This CodeE06.0Acute thyroiditis

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Abscess of thyroid
  • Acute bacterial thyroiditis
  • Acute fungal thyroiditis
  • Acute non-suppurative thyroiditis
  • Acute suppurative thyroiditis
  • Acute thyroiditis
  • Infectious thyroiditis
  • Thyroid infection
  • Thyrotoxicosis due to acute thyroiditis

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • Abscess of thyroid
  • Pyogenic thyroiditis
  • Suppurative thyroiditis

Use Additional Code

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Abscess(connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic)
      • thyroid (gland)
    • Suppuration, suppurative
      • thyroid (gland)
    • Thyroiditis
      • acute (nonsuppurative) (pyogenic) (suppurative)
    • Thyroiditis
      • pyogenic
    • Thyroiditis
      • suppurative

Clinical ClassificationClinical

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

CCSR END001
Thyroid disorders
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Acute Suppurative Thyroiditis

    thyroiditis due to a bacterial infection.

Patient EducationClinical

Thyroid Diseases

Your thyroid is a small, butterfly-shaped gland in the front of your neck. It makes hormones that control the way the body uses energy. These hormones affect nearly every organ in your body and control many of your body's most important functions. For example, they affect your breathing, heart rate, weight, digestion, and moods.

Read the full article at MedlinePlus

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

Convert E06.0 to ICD-9-CMHistory

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

ICD-9-CM
245.0 Acute thyroiditis
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 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About E06.0Overview

Is E06.0 (Thyroiditis) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report acute thyroiditis on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does E06.0 group to?

When acute thyroiditis 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 E06.0?

Under the General Equivalence Mappings, acute thyroiditis converts to ICD-9-CM 245.0 (acute thyroiditis). 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.