2026 ICD-10-CM Diagnosis Code C79.70Secondary malignant neoplasm of unspecified adrenal gland

ICD-10-CM Codes›C00–D49›C76-C80›C79

ICD-10-CM C79.70
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

C79.70 is a billable ICD-10-CM diagnosis code for secondary malignant neoplasm of unspecified adrenal 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 Secondary malignancies.

Code Identity

ICD-10-CM Code
C79.70
Billable Status
Yes — Valid for Submission
Code Describes
Secondary malignant neoplasm of unspecified adrenal gland
Short Description
Secondary malignant neoplasm of unspecified adrenal gland
Same as the full description in the CMS dataset.
Parent Code
C79.7
Secondary malignant neoplasm of adrenal gland

Code Classification

ChapterC00–D49Neoplasms
SectionC76-C80Malignant neoplasms of ill-defined, other secondary and unspecified sites
CategoryC79Secondary malignant neoplasm of other and unspecified sites
This CodeC79.70Secondary malignant neoplasm of unspecified adrenal gland

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Adrenal gland involved by direct invasion of renal tumor
  • Adrenal insufficiency due to adrenal metastasis
  • Adrenal neuroblastoma
  • Malignant neoplasm of adrenal cortex
  • Malignant neoplasm of adrenal medulla
  • Metastatic malignant neoplasm to adrenal cortex
  • Metastatic malignant neoplasm to adrenal gland
  • Metastatic malignant neoplasm to adrenal medulla
  • Metastatic neuroblastoma
  • Metastatic neuroblastoma to adrenal gland
  • Renal tumor finding
  • Renal tumor invasion into adrenal gland macroscopically

Clinical ClassificationClinical

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

CCSR NEO070
Secondary malignancies
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Metastatic Neuroblastoma

    a neuroblastoma that has metastasized from its original site of growth to another anatomic site.

Table of NeoplasmsClinical

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

SiteMalig.
Primary		Malig.
Secondary		Ca
in situ		BenignUncertainUnspec.
adrenalC74.9C79.7D09.3D35.0D44.1D49.7
adrenal › capsuleC74.9C79.7D09.3D35.0D44.1D49.7
adrenal › cortexC74.0C79.7D09.3D35.0D44.1D49.7
adrenal › glandC74.9C79.7D09.3D35.0D44.1D49.7
adrenal › medullaC74.1C79.7D09.3D35.0D44.1D49.7
cortexC74.0C79.7D09.3D35.0D44.1D49.7
cortex › adrenalC74.0C79.7D09.3D35.0D44.1D49.7
medullaC74.1C79.7D09.3D35.0D44.1D49.7
medulla › adrenalC74.1C79.7D09.3D35.0D44.1D49.7
suprarenalC74.9C79.7D09.3D35.0D44.1D49.7
suprarenal › capsuleC74.9C79.7D09.3D35.0D44.1D49.7
suprarenal › cortexC74.0C79.7D09.3D35.0D44.1D49.7
suprarenal › glandC74.9C79.7D09.3D35.0D44.1D49.7
suprarenal › medullaC74.1C79.7D09.3D35.0D44.1D49.7

Patient EducationClinical

Adrenal Gland Cancer

Your adrenal, or suprarenal, glands are located on the top of each kidney. These glands produce hormones that you can't live without, including sex hormones and cortisol, which helps you respond to stress and has many other functions.

Read the full article at MedlinePlus

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

Convert C79.70 to ICD-9-CMHistory

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

ICD-9-CM
198.7 Second malig neo adrenal
Approximate The match is approximate rather than exact.

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 C79.70Overview

Is C79.70 (Secondary malignant neoplasm of adrenal gland) a billable code?

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

What MS-DRG does C79.70 group to?

When secondary malignant neoplasm of unspecified adrenal 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 C79.70?

Under the General Equivalence Mappings, secondary malignant neoplasm of unspecified adrenal gland converts to ICD-9-CM 198.7 (second malig neo adrenal). The mapping is approximate, so confirm the match fits the documentation.

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.