| K29 | Gastritis and duodenitis | NON-BILLABLE CODE |
| K29.0 | Acute gastritis | NON-BILLABLE CODE |
| K29.00 | Acute gastritis without bleeding | BILLABLE CODE |
| K29.01 | Acute gastritis with bleeding | BILLABLE CODE |
| K29.2 | Alcoholic gastritis | NON-BILLABLE CODE |
| K29.20 | Alcoholic gastritis without bleeding | BILLABLE CODE |
| K29.21 | Alcoholic gastritis with bleeding | BILLABLE CODE |
| K29.3 | Chronic superficial gastritis | NON-BILLABLE CODE |
| K29.30 | Chronic superficial gastritis without bleeding | BILLABLE CODE |
| K29.31 | Chronic superficial gastritis with bleeding | BILLABLE CODE |
| K29.4 | Chronic atrophic gastritis | NON-BILLABLE CODE |
| K29.40 | Chronic atrophic gastritis without bleeding | BILLABLE CODE |
| K29.41 | Chronic atrophic gastritis with bleeding | BILLABLE CODE |
| K29.5 | Unspecified chronic gastritis | NON-BILLABLE CODE |
| K29.50 | Unspecified chronic gastritis without bleeding | BILLABLE CODE |
| K29.51 | Unspecified chronic gastritis with bleeding | BILLABLE CODE |
| K29.6 | Other gastritis | NON-BILLABLE CODE |
| K29.60 | Other gastritis without bleeding | BILLABLE CODE |
| K29.61 | Other gastritis with bleeding | BILLABLE CODE |
| K29.7 | Gastritis, unspecified | NON-BILLABLE CODE |
| K29.71 | Gastritis, unspecified, with bleeding | BILLABLE CODE |
| K29.8 | Duodenitis | NON-BILLABLE CODE |
| K29.80 | Duodenitis without bleeding | BILLABLE CODE |
| K29.81 | Duodenitis with bleeding | BILLABLE CODE |
| K29.9 | Gastroduodenitis, unspecified | NON-BILLABLE CODE |
| K29.90 | Gastroduodenitis, unspecified, without bleeding | BILLABLE CODE |
| K29.91 | Gastroduodenitis, unspecified, with bleeding | BILLABLE CODE |
