2026 ICD-10-CM Diagnosis Code C75.0Malignant neoplasm of parathyroid gland

ICD-10-CM Codes›C00–D49›C73-C75›C75

ICD-10-CM C75.0
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

C75.0 is a billable ICD-10-CM diagnosis code for malignant neoplasm of parathyroid 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. Coders also document this condition as adenocarcinoma of parathyroid gland. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Endocrine system cancers - parathyroid.

Code Identity

ICD-10-CM Code
C75.0
Billable Status
Yes — Valid for Submission
Code Describes
Malignant neoplasm of parathyroid gland
Short Description
Malignant neoplasm of parathyroid gland
Same as the full description in the CMS dataset.
Parent Code
C75
Malignant neoplasm of other endocrine glands and related structures

Code Classification

ChapterC00–D49Neoplasms
SectionC73-C75Malignant neoplasms of thyroid and other endocrine glands
CategoryC75Malignant neoplasm of other endocrine glands and related structures
This CodeC75.0Malignant neoplasm of parathyroid gland

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Adenocarcinoma of parathyroid gland
  • Malignant neoplasm of parathyroid gland
  • Parathyroid carcinoma
  • Primary adenocarcinoma of parathyroid gland
  • Primary malignant neoplasm of parathyroid gland
  • Primary parathyroid carcinoma

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.

    • Adenocarcinoma
      • water-clear cell
    • Carcinoma(malignant)
      • water-clear cell

Clinical ClassificationClinical

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

CCSR NEO054
Endocrine system cancers - parathyroid
Default principal diagnosis: inpatient Yes · outpatient Yes

Table of NeoplasmsClinical

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

SiteMalig.
Primary		Malig.
Secondary		Ca
in situ		BenignUncertainUnspec.
parathyroid (gland)C75.0C79.89D09.3D35.1D44.2D49.7

Patient EducationClinical

Parathyroid cancer

Parathyroid cancer is a rare cancer that usually affects people in their forties or fifties and occurs in one of the four parathyroid glands. The parathyroid glands are located in the neck and secrete parathyroid hormone, which enhances the release of calcium into the blood.

Read the full article at MedlinePlus

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

Convert C75.0 to ICD-9-CMHistory

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

ICD-9-CM
194.1 Malig neo parathyroid
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 C75.0Overview

Is C75.0 a billable code?

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

What MS-DRG does C75.0 group to?

When malignant neoplasm of parathyroid 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 C75.0?

Under the General Equivalence Mappings, malignant neoplasm of parathyroid gland converts to ICD-9-CM 194.1 (malig neo parathyroid). The mapping is a direct match.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.