331 MS-DRG: MAJOR SMALL AND LARGE BOWEL PROCEDURES WITHOUT CC/MCC
MS-DRG 331 groups Medicare inpatient hospital stays for: MAJOR SMALL AND LARGE BOWEL PROCEDURES WITHOUT CC/MCC. This is a surgical MS-DRG. It falls under MDC 06 (Diseases and Disorders of the Digestive System).
Payment & Classification Data
Official CMS values from the FY2027 IPPS Final Rule Table 5.
| Major Diagnostic Category | MDC 06 — Diseases and Disorders of the Digestive System |
| DRG Type | Surgical |
| Severity Level | None |
| Relative Weight | 1.7465 |
| Relative Weight (10% Cap Applied) | 1.7465 |
| Geometric Mean Length of Stay | 2.6 days |
| Arithmetic Mean Length of Stay | 3.1 days |
| Post-Acute Transfer DRG | Yes |
| Special Pay Transfer DRG | No |
Defining Codes (FY2027)
1,595 procedure codes appear in its surgical logic (Major Small and Large Bowel Procedures: 1,595): 0D18074, 0D18078, 0D1807H, 0D1807K, 0D1807L, 0D1807M, 0D1807N, 0D1807P, 0D1807Q, 0D180J4, 0D180J8, 0D180JH and 1,583 more.
From the CMS MS-DRG Definitions Manual (Appendices B and E). Assignment also depends on severity, discharge status and the rest of the claim.
Surgical Precedence (FY2027)
Within MDC 06, this DRG ranks 2 of 9 in CMS's surgical-class precedence order. When a claim qualifies for more than one surgical DRG in this MDC, the highest-ranked class applies.
- 1. Stomach, Esophageal and Duodenal Procedures (DRGs 326-328)
- 2. Major Small and Large Bowel Procedures (DRGs 329-331) — this DRG
- 3. Rectal Resection (DRGs 332-334)
- 4. Peritoneal Adhesiolysis (DRGs 335-337)
- 5. Appendix Procedures (DRGs 397-399)
- 6. Minor Small and Large Bowel Procedures (DRGs 344-346)
- 7. Anal and Stomal Procedures (DRGs 347-349)
- 8. Hernia Procedures (DRGs 350-355)
- 9. Other Digestive System O.R. Procedures (DRGs 356-358)
From the CMS MS-DRG Definitions Manual, Appendix D. Actual DRG assignment depends on the complete claim.
Contextual Map
Every relationship of 331 in one view: hierarchy, official tabular instructions in both directions, clinical classification, risk adjustment, MS-DRG participation, index terms and change history — each edge carrying the CMS source it derives from.
Major Diagnostic Category
- MDC 06 — Diseases and Disorders of the Digestive System[MDC]— CMS MS-DRG Definitions Manual · FY2027
Defining procedures (1595)
- 0D18074 — Bypass Small Intestine to Cutaneous with Autologous Tissue Substitute, Open Approach[Grouper procedure]— CMS MS-DRG Definitions Manual (Appendix E) · FY2027
- 0D18078 — Bypass Small Intestine to Small Intestine with Autologous Tissue Substitute, Open Approach[Grouper procedure]— CMS MS-DRG Definitions Manual (Appendix E) · FY2027
- 0D1807H — Bypass Small Intestine to Cecum with Autologous Tissue Substitute, Open Approach[Grouper procedure]— CMS MS-DRG Definitions Manual (Appendix E) · FY2027
- 0D1807K — Bypass Small Intestine to Ascending Colon with Autologous Tissue Substitute, Open Approach[Grouper procedure]— CMS MS-DRG Definitions Manual (Appendix E) · FY2027
- 0D1807L — Bypass Small Intestine to Transverse Colon with Autologous Tissue Substitute, Open Approach[Grouper procedure]— CMS MS-DRG Definitions Manual (Appendix E) · FY2027
- 0D1807M — Bypass Small Intestine to Descending Colon with Autologous Tissue Substitute, Open Approach[Grouper procedure]— CMS MS-DRG Definitions Manual (Appendix E) · FY2027
- 0D1807N — Bypass Small Intestine to Sigmoid Colon with Autologous Tissue Substitute, Open Approach[Grouper procedure]— CMS MS-DRG Definitions Manual (Appendix E) · FY2027
- 0D1807P — Bypass Small Intestine to Rectum with Autologous Tissue Substitute, Open Approach[Grouper procedure]— CMS MS-DRG Definitions Manual (Appendix E) · FY2027
- and 1587 more
DRG family
- DRG 329 — MAJOR SMALL AND LARGE BOWEL PROCEDURES WITH MCC[DRG family]: “MAJOR SMALL AND LARGE BOWEL PROCEDURES WITH MCC — same CMS DRG family (329-331), split by severity.”— CMS MS-DRG Definitions Manual (DRG family 329-331) · FY2027
- DRG 330 — MAJOR SMALL AND LARGE BOWEL PROCEDURES WITH CC[DRG family]: “MAJOR SMALL AND LARGE BOWEL PROCEDURES WITH CC — same CMS DRG family (329-331), split by severity.”— CMS MS-DRG Definitions Manual (DRG family 329-331) · FY2027
Read from: CMS MS-DRG Definitions Manual (incl. Appendix B diagnosis index, Appendix C CC/MCC list, Appendix E procedure index) and IPPS Final Rule tables — v44. All data sources · How to read the labels · How MedCoder verifies its implementation
Current data releases:ICD-10-CM FY2027 · ICD-10-PCS FY2027 · HCPCS October 2026 · MS-DRG v44 · Medicare Code Editor v44.0 · NCCI PTP Q4 2026 · MUE Q4 2026 · NCD code lists 2026-01 · LCD export September 28, 2026 · All releases and sources