2026 ICD-10-CM Diagnosis Code E07.0Hypersecretion of calcitonin

ICD-10-CM Codes›E00–E89›E00-E07›E07

ICD-10-CM E07.0
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

E07.0 is a billable ICD-10-CM diagnosis code for hypersecretion of calcitonin. 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. Coders also document this condition as c-cell hyperplasia of thyroid. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Thyroid disorders.

Code Identity

ICD-10-CM Code
E07.0
Billable Status
Yes — Valid for Submission
Code Describes
Hypersecretion of calcitonin
Short Description
Hypersecretion of calcitonin
Same as the full description in the CMS dataset.
Parent Code
E07
Other disorders of thyroid

Code Classification

ChapterE00–E89Endocrine, nutritional and metabolic diseases
SectionE00-E07Disorders of thyroid gland
CategoryE07Other disorders of thyroid
This CodeE07.0Hypersecretion of calcitonin

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • C-cell hyperplasia of thyroid
  • Disorder of thyrocalcitonin secretion
  • Hypersecretion of calcitonin

Tabular List NotesGuidance

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

Inclusion Terms

  • C-cell hyperplasia of thyroid
  • Hypersecretion of thyrocalcitonin

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.

    • Disorder(of)
      • secretion, thyrocalcitonin
    • Disorder(of)
      • thyrocalcitonin hypersecretion
    • Hyperplasia, hyperplastic
      • C-cell, thyroid
    • Hypersecretion
      • calcitonin
    • Hypersecretion
      • thyrocalcitonin

Clinical ClassificationClinical

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

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

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 E07.0 to ICD-9-CMHistory

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

ICD-9-CM
246.0 Dis thyrocalciton secret
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 E07.0Overview

Is E07.0 (Other disorders of thyroid) a billable code?

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

What MS-DRG does E07.0 group to?

When hypersecretion of calcitonin 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 E07.0?

Under the General Equivalence Mappings, hypersecretion of calcitonin converts to ICD-9-CM 246.0 (dis thyrocalciton secret). 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.