2026 ICD-10-CM Diagnosis Code D19.9Benign neoplasm of mesothelial tissue, unspecified

ICD-10-CM Codes›C00–D49›D10-D36›D19

ICD-10-CM D19.9
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

D19.9 is a billable ICD-10-CM diagnosis code for benign neoplasm of mesothelial tissue, unspecified. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 826 through 830, 843 through 845. Coders also document this condition as benign neoplasm of mesothelium. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Benign neoplasms.

Code Identity

ICD-10-CM Code
D19.9
Billable Status
Yes — Valid for Submission
Code Describes
Benign neoplasm of mesothelial tissue, unspecified
Short Description
Benign neoplasm of mesothelial tissue, unspecified
Same as the full description in the CMS dataset.
Parent Code
D19
Benign neoplasm of mesothelial tissue

Code Classification

ChapterC00–D49Neoplasms
SectionD10-D36Benign neoplasms, except benign neuroendocrine tumors
CategoryD19Benign neoplasm of mesothelial tissue
This CodeD19.9Benign neoplasm of mesothelial tissue, unspecified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Benign neoplasm of mesothelium

Tabular List NotesGuidance

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

Inclusion Terms

  • Benign mesothelioma NOS

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.

    • Mesothelioma(malignant)
      • benign
        • unspecified site
    • Mesothelioma(malignant)
      • biphasic
        • benign
          • unspecified site
    • Mesothelioma(malignant)
      • epithelioid
        • benign
          • unspecified site
    • Mesothelioma(malignant)
      • fibrous
        • benign
          • unspecified site

Clinical ClassificationClinical

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

CCSR NEO073
Benign neoplasms
Default principal diagnosis: inpatient Yes · outpatient Yes

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 D19.9 to ICD-9-CMHistory

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

ICD-9-CM
229.9 Benign neoplasm NOS
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 D19.9Overview

Is D19.9 (Benign neoplasm of mesothelial tissue) a billable code?

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

What MS-DRG does D19.9 group to?

When benign neoplasm of mesothelial tissue, unspecified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 826, 827, 828, 829, 830, 843, 844, 845, with relative weights from 0.8516 to 4.6778 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of D19.9?

Under the General Equivalence Mappings, benign neoplasm of mesothelial tissue, unspecified converts to ICD-9-CM 229.9 (benign neoplasm NOS). The mapping is approximate, so confirm the match fits the documentation.

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.