Gastritis and duodenitis (K29) ICD-10-CM
The K29 code range covers gastritis and duodenitis with 28 ICD-10-CM diagnosis codes. 18 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
Codes in the K29 Range 28 codes · 18 billable
- K29 Gastritis and duodenitisNon-billable
- K29.0 Acute gastritisNon-billable
- K29.00 Acute gastritis without bleeding
- K29.01 Acute gastritis with bleeding
- K29.2 Alcoholic gastritisNon-billable
- K29.20 Alcoholic gastritis without bleeding
- K29.21 Alcoholic gastritis with bleeding
- K29.3 Chronic superficial gastritisNon-billable
- K29.30 Chronic superficial gastritis without bleeding
- K29.31 Chronic superficial gastritis with bleeding
- K29.4 Chronic atrophic gastritisNon-billable
- K29.40 Chronic atrophic gastritis without bleeding
- K29.41 Chronic atrophic gastritis with bleeding
- K29.5 Unspecified chronic gastritisNon-billable
- K29.50 Unspecified chronic gastritis without bleeding
- K29.51 Unspecified chronic gastritis with bleeding
- K29.6 Other gastritisNon-billable
- K29.60 Other gastritis without bleeding
- K29.61 Other gastritis with bleeding
- K29.7 Gastritis, unspecifiedNon-billable
- K29.70 Gastritis, unspecified, without bleeding
- K29.71 Gastritis, unspecified, with bleeding
- K29.8 DuodenitisNon-billable
- K29.80 Duodenitis without bleeding
- K29.81 Duodenitis with bleeding
- K29.9 Gastroduodenitis, unspecifiedNon-billable
- K29.90 Gastroduodenitis, unspecified, without bleeding
- K29.91 Gastroduodenitis, unspecified, with bleeding
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the K29 range.
Ancylostoma
A genus of nematode intestinal parasites that consists of several species. A. duodenale is the common hookworm in humans. A. braziliense, A. ceylonicum, and A. caninum occur primarily in cats and dogs, but all have been known to occur in humans.
Ancylostomiasis
Infection of humans or animals with hookworms of the genus ANCYLOSTOMA. Characteristics include anemia, dyspepsia, eosinophilia, and abdominal swelling.
Duodenitis
Inflammation of the DUODENUM section of the small intestine (INTESTINE, SMALL). Erosive duodenitis may cause bleeding in the UPPER GI TRACT and PEPTIC ULCER.
Gastric Mucosa
Lining of the STOMACH, consisting of an inner EPITHELIUM, a middle LAMINA PROPRIA, and an outer MUSCULARIS MUCOSAE. The surface cells produce MUCUS that protects the stomach from attack by digestive acid and enzymes. When the epithelium invaginates into the LAMINA PROPRIA at various region of the stomach (CARDIA; GASTRIC FUNDUS; and PYLORUS), different tubular gastric glands are formed. These glands consist of cells that secrete mucus, enzymes, HYDROCHLORIC ACID, or hormones.
Gastritis
Inflammation of the GASTRIC MUCOSA, a lesion observed in a number of unrelated disorders.
Gastritis, Atrophic
GASTRITIS with atrophy of the GASTRIC MUCOSA, the GASTRIC PARIETAL CELLS, and the mucosal glands leading to ACHLORHYDRIA. Atrophic gastritis usually progresses from chronic gastritis.
Gastritis, Hypertrophic
GASTRITIS with HYPERTROPHY of the GASTRIC MUCOSA. It is characterized by giant gastric folds, diminished acid secretion, excessive MUCUS secretion, and HYPOPROTEINEMIA. Symptoms include VOMITING; DIARRHEA; and WEIGHT LOSS.
About the K29 Code Range
The ICD-10 code section K29 covers a range of conditions related to inflammation of the stomach lining (gastritis) and the first part of the small intestine (duodenitis). These codes help specify the exact type, cause, and whether bleeding is involved, guiding accurate diagnosis and treatment.
This section includes acute gastritis (K29.0), which can be erosive or superficial and may or may not involve bleeding; alcoholic gastritis (K29.2), linked to alcohol consumption and sometimes causing bleeding; and chronic forms such as superficial, atrophic, and unspecified gastritis, each with distinct characteristics and potential complications. Terms like erosive gastritis, acute neutrophilic gastritis, and Helicobacter pylori-associated gastritis correspond to specific codes here, helping coders pinpoint precise diagnoses. The section also covers duodenitis (K29.8), including infectious and immune-related causes, with codes distinguishing bleeding status. The unspecified gastritis and gastroduodenitis codes (K29.7, K29.9) are used when the inflammation’s origin or type is unclear. Using these detailed codes ensures accurate medical records and appropriate clinical care.
Questions About This Page
How many billable codes are in the K29 range?
Of the 28 codes in this range, 18 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the K29 range classify?
The range classifies gastritis and duodenitis. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
