ICD-10-CM Alphabetic Index · FY 2026 35 Entries
Mass in the ICD-10-CM Index ICD-10-CM
The main term Mass carries 35 index entries pointing to 21 ICD-10-CM codes. Every indented line below refines the term by site, cause, or type. Verify any candidate code in the Tabular List before using it.
✓ Built from the official CMS FY 2026 index fileEffective Oct 1, 2025 – Sep 30, 2026
35
Index Entries
21
Codes Referenced
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Default Code
M
Letter
35 of 35 shown
ICD-10-CM
Index Entries Under Mass 35 entries · 21 codes
Mass
abdominal R19.00
epigastric R19.06
generalized R19.07
left lower quadrant R19.04
left upper quadrant R19.02
periumbilic R19.05
right lower quadrant R19.03
right upper quadrant R19.01
specified site NEC R19.09
breast N63.0 see also Lump, breast
chest R22.2
cystic see Cyst
ear H93.8 Non-billable
head R22.0
intra-abdominal (diffuse) (generalized) see Mass, abdominal
kidney N28.89
liver R16.0
localized (skin) R22.9
chest R22.2
head R22.0
limb
lower R22.4 Non-billable
upper R22.3 Non-billable
neck R22.1
trunk R22.2
lung R91.8
malignant see Neoplasm, malignant, by site
neck R22.1
pelvic (diffuse) (generalized) see Mass, abdominal
specified organ NEC see Disease, by site
splenic R16.1
substernal thyroid see Goiter
superficial (localized) R22.9
umbilical (diffuse) (generalized) R19.09
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Related Index Terms
Source: Centers for Medicare & Medicaid Services, FY 2026 ICD-10-CM Index to Diseases and Injuries release files, effective October 1, 2025 through September 30, 2026.
