2026 ICD-10-CM Diagnosis Code R19.00Intra-abdominal and pelvic swelling, mass and lump, unspecified site

ICD-10-CM Codes›R00–R99›R10-R19›R19

ICD-10-CM R19.00
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

R19.00 is a billable ICD-10-CM diagnosis code for intra-abdominal and pelvic swelling, mass and lump, unspecified site. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 391 through 392. As a symptom code, it should not be used as a principal diagnosis once a related definitive diagnosis has been established. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Abdominal pain and other digestive/abdomen signs and symptoms.

Code Identity

ICD-10-CM Code
R19.00
Billable Status
Yes — Valid for Submission
Code Describes
Intra-abdominal and pelvic swelling, mass and lump, unspecified site
Short Description
Intra-abd and pelvic swelling, mass and lump, unsp site
Parent Code
R19.0
Intra-abdominal and pelvic swelling, mass and lump

Code Classification

ChapterR00–R99Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified
SectionR10-R19Symptoms and signs involving the digestive system and abdomen
CategoryR19Other symptoms and signs involving the digestive system and abdomen
This CodeR19.00Intra-abdominal and pelvic swelling, mass and lump, unspecified site

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Abdomen tympanitic
  • Abdominal dullness finding
  • Abdominal mass
  • Abdominal organomegaly
  • Cyst of abdomen
  • Defined border of mass of abdomen
  • Defined lower border of mass of abdomen
  • Defined upper border of mass of abdomen
  • Distinct abdominal protrusion
  • Dullness over mass of abdomen
  • Finding of contour of abdomen
  • Finding of movement of mass with respiration
  • Groin mass
  • Hard mass of abdomen
  • Irregular abdominal contour
  • Irregular shape of mass of abdomen
  • Localized abdominal dullness to percussion - finding
  • Mass does not move with respiration
  • Mass moves with respiration
  • Mass of abdomen still during respiration
  • Mass of abdominal cavity structure
  • Movement of mass of abdomen on respiration
  • Pelvic mass
  • Pelvic mass in pregnancy
  • Pelvic swelling
  • Pressure indents rectal mass
  • Rectal mass
  • Regular shape of mass of abdomen
  • Retroperitoneal mass
  • Scrotal mass
  • Soft mass of abdomen
  • Tympany of mass of abdomen
  • Visible abdominal mass

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 SYM006
Abdominal pain and other digestive/abdomen signs and symptoms
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Abdominal Mass

    an abnormal growth in the abdomen.

  • CDAI Version 1 - Abdominal Mass Subscore|CDAI01-Abdominal Mass Subscore|CDAI01-Abdominal Mass Subscore|CDAI0120

    crohn's disease activity index version 1 (cdai version 1) abdominal mass subscore.

  • CDAI Version 1 - Abdominal Mass|CDAI01-Abdominal Mass|CDAI01-Abdominal Mass|CDAI0107

    crohn's disease activity index version 1 (cdai version 1) abdominal mass.

  • HBI - Abdominal Mass|HBI01-Abdominal Mass|HBI01-Abdominal Mass|HBI0104

    harvey-bradshaw index (hbi) abdominal mass.

  • Pelvic Mass

    a benign or malignant tumor-like pathologic process involving the organs and structures in the pelvis.

  • Robot-assisted Salvage Pelvic Mass Resection

    a surgical technique that uses a specially designed robotic system to aid removal of a pelvic mass after failure of initial surgery or other treatment modalities.

Convert R19.00 to ICD-9-CMHistory

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

ICD-9-CM
789.30 Abdmnal mass unspcf site
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 R19.00Overview

What is the ICD-10 code for intra-abdominal and pelvic swelling, mass and lump, unspecified site?

The ICD-10-CM code for intra-abdominal and pelvic swelling, mass and lump, unspecified site is R19.00 (sometimes written as R1900). It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Is R19.00 (Intra-abdominal and pelvic swelling, mass and lump) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report intra-abdominal and pelvic swelling, mass and lump, unspecified site on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does R19.00 group to?

When intra-abdominal and pelvic swelling, mass and lump, unspecified site is the principal diagnosis on an inpatient stay, it groups to MS-DRG 391, 392, with relative weights from 0.7796 to 1.2683 depending on complications. Higher weights mean higher Medicare reimbursement.

Can R19.00 be a principal diagnosis?

Use it with care. This is a symptom code, so once a definitive diagnosis explaining the intra-abdominal and pelvic swelling, mass and lump, unspecified site is established, that condition takes the principal position instead.

What is the ICD-9 equivalent of R19.00?

Under the General Equivalence Mappings, intra-abdominal and pelvic swelling, mass and lump, unspecified site converts to ICD-9-CM 789.30 (abdmnal mass unspcf site). The mapping is a direct match.