ICD-10-CM 2027
ICD-10 code for abdominal mass
From the official ICD-10-CM alphabetic index entry “Mass › abdominal”. Page updated September 29, 2026.
About coding abdominal mass
The ICD-10-CM code for abdominal mass is R19.00 (Intra-abdominal and pelvic swelling, mass and lump, unspecified site). The official index lists 8 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on R19.00.
Within R19.0, choose R19.00 (unspecified site) only when documentation doesn't support a more specific option: right upper quadrant abdominal swelling, mass and lump (R19.01), left upper quadrant abdominal swelling, mass and lump (R19.02), right lower quadrant abdominal swelling, mass and lump (R19.03), left lower quadrant abdominal swelling, mass and lump (R19.04), periumbilic swelling, mass or lump (R19.05), epigastric swelling, mass or lump (R19.06), generalized intra-abdominal and pelvic swelling, mass and lump (R19.07) and other intra-abdominal and pelvic swelling, mass and lump (R19.09).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 391 (Esophagitis, Gastroenteritis and Miscellaneous Digestive Disorders with MCC, relative weight 1.2392) and DRG 392 (Esophagitis, Gastroenteritis and Miscellaneous Digestive Disorders without MCC, relative weight 0.7645), in MDC 06 (Diseases and Disorders of the Digestive System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
More specific abdominal mass codes (official index)
- epigastric R19.06 — Epigastric swelling, mass or lump
- generalized R19.07 — Generalized intra-abdominal and pelvic swelling, mass and lump
- left lower quadrant R19.04 — Left lower quadrant abdominal swelling, mass and lump
- left upper quadrant R19.02 — Left upper quadrant abdominal swelling, mass and lump
- periumbilic R19.05 — Periumbilic swelling, mass or lump
- right lower quadrant R19.03 — Right lower quadrant abdominal swelling, mass and lump
- right upper quadrant R19.01 — Right upper quadrant abdominal swelling, mass and lump
- specified site NEC R19.09 — Other intra-abdominal and pelvic swelling, mass and lump
Common questions about abdominal mass ICD-10 codes
What is the ICD-10 code for abdominal mass?
- R19.00 — Intra-abdominal and pelvic swelling, mass and lump, unspecified site. More specific codes apply when the documentation supports them: R19.06, R19.07, R19.04, R19.02 and others below.
What is the ICD-10 code for epigastric abdominal mass?
- R19.06 — Epigastric swelling, mass or lump.
What is the ICD-10 code for generalized abdominal mass?
- R19.07 — Generalized intra-abdominal and pelvic swelling, mass and lump.
What is the ICD-10 code for left lower quadrant abdominal mass?
- R19.04 — Left lower quadrant abdominal swelling, mass and lump.
What is the ICD-10 code for left upper quadrant abdominal mass?
- R19.02 — Left upper quadrant abdominal swelling, mass and lump.
What is the ICD-10 code for periumbilic abdominal mass?
- R19.05 — Periumbilic swelling, mass or lump.
What is the ICD-10 code for right lower quadrant abdominal mass?
- R19.03 — Right lower quadrant abdominal swelling, mass and lump.
Is R19.00 billable?
- Yes. R19.00 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can R19.00 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict R19.00 as a principal diagnosis.
Is R19.00 a CC or MCC?
- No. R19.00 is neither a CC nor an MCC under MS-DRG v44.0.