2027 ICD-10-CM Diagnosis Code D19.1Benign neoplasm of mesothelial tissue of peritoneum

ICD-10-CM Codes›C00–D49›D10-D36›D19

ICD-10-CM D19.1
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

D19.1 is a billable ICD-10-CM diagnosis code for benign neoplasm of mesothelial tissue of peritoneum. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 393 through 395. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Benign neoplasms.

Code Identity

ICD-10-CM Code
D19.1
Billable Status
Yes — Valid for Submission
Code Describes
Benign neoplasm of mesothelial tissue of peritoneum
Short Description
Benign neoplasm of mesothelial tissue of peritoneum
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 CodeD19.1Benign neoplasm of mesothelial tissue of peritoneum

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Benign neoplasm of mesothelial tissue of peritoneum
  • Benign neoplasm of mesothelium
  • Peritoneal cystic mesothelioma

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to D19.1: its own notes plus those printed at Chapter 2. A note printed at a category, block or chapter applies to every code under it.

Notes

General instructions on how these codes are used.

From Chapter 2 (C00-D49) Neoplasms applies to 1,730 codes
  • Functional activity
  • All neoplasms are classified in this chapter, whether they are functionally active or not. An additional code from Chapter 4 may be used, to identify functional activity associated with any neoplasm.
  • Morphology [Histology]
  • Chapter 2 classifies neoplasms primarily by site (topography), with broad groupings for behavior, malignant, in situ, benign, etc. The Table of Neoplasms should be used to identify the correct topography code. In a few cases, such as for malignant melanoma and certain neuroendocrine tumors, the morphology (histologic type) is included in the category and codes.
  • Primary malignant neoplasms overlapping site boundaries
  • A primary malignant neoplasm that overlaps two or more contiguous (next to each other) sites should be classified to the subcategory/code .8 ('overlapping lesion'), unless the combination is specifically indexed elsewhere. For multiple neoplasms of the same site that are not contiguous, such as tumors in different quadrants of the same breast, codes for each site should be assigned.
  • Malignant neoplasm of ectopic tissue
  • Malignant neoplasms of ectopic tissue are to be coded to the site mentioned, e.g., ectopic pancreatic malignant neoplasms are coded to pancreas, unspecified (C25.9).

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name D19.1, its category, or a range that includes it.

Excludes1 2

These codes carry an Excludes1 note naming D19.1: they are not reported together with it, unless the two conditions are unrelated.

  • D15 Benign neoplasm of other and unspecified intrathoracic organs
    benign neoplasm of mesothelial tissue (D19.-) names D19.-, which includes this code
  • D20 Benign neoplasm of soft tissue of retroperitoneum and peritoneum
    benign neoplasm of mesothelial tissue (D19.-) names D19.-, which includes this code

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

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 D19.1 to ICD-9-CMHistory

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

ICD-9-CM
211.8 Ben neo peritoneum
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 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About D19.1Overview

What is the ICD-10 code for benign neoplasm of mesothelial tissue of peritoneum?

The ICD-10-CM code for benign neoplasm of mesothelial tissue of peritoneum is D19.1 (sometimes written as D191). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is D19.1 (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 of peritoneum on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does D19.1 group to?

When benign neoplasm of mesothelial tissue of peritoneum is the principal diagnosis on an inpatient stay, it groups to MS-DRG 394, 395, 393, with relative weights from 0.6379 to 1.5877 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of D19.1?

Under the General Equivalence Mappings, benign neoplasm of mesothelial tissue of peritoneum converts to ICD-9-CM 211.8 (ben neo peritoneum). The mapping is approximate, so confirm the match fits the documentation.