863 MS-DRG: POSTOPERATIVE AND POST-TRAUMATIC INFECTIONS WITHOUT MCC
MS-DRG 863 groups Medicare inpatient hospital stays for: POSTOPERATIVE AND POST-TRAUMATIC INFECTIONS WITHOUT MCC. This is a medical MS-DRG. It falls under MDC 18 (Infectious and Parasitic Diseases, Systemic or Unspecified Sites).
Payment & Classification Data
Official CMS values from the FY2027 IPPS Final Rule Table 5.
| Major Diagnostic Category | MDC 18 — Infectious and Parasitic Diseases, Systemic or Unspecified Sites |
| DRG Type | Medical |
| Severity Level | None |
| Relative Weight | 0.9866 |
| Relative Weight (10% Cap Applied) | 0.9866 |
| Geometric Mean Length of Stay | 3.3 days |
| Arithmetic Mean Length of Stay | 4.1 days |
| Post-Acute Transfer DRG | Yes |
| Special Pay Transfer DRG | No |
Defining Codes (FY2027)
7 diagnosis codes can drive assignment here: K68.11, T81.40XA, T81.41XA, T81.42XA, T81.43XA, T81.44XA, T81.49XA.
From the CMS MS-DRG Definitions Manual (Appendices B and E). Assignment also depends on severity, discharge status and the rest of the claim.
Contextual Map
Every relationship of 863 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 18 — Infectious and Parasitic Diseases, Systemic or Unspecified Sites[MDC]— CMS MS-DRG Definitions Manual · FY2027
Defining diagnoses
- K68.11 — Postprocedural retroperitoneal abscess[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- T81.40XA — Infection following a procedure, unspecified, initial encounter[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- T81.41XA — Infection following a procedure, superficial incisional surgical site, initial encounter[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- T81.42XA — Infection following a procedure, deep incisional surgical site, initial encounter[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- T81.43XA — Infection following a procedure, organ and space surgical site, initial encounter[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- T81.44XA — Sepsis following a procedure, initial encounter[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- T81.49XA — Infection following a procedure, other surgical site, initial encounter[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
DRG family
- DRG 862 — POSTOPERATIVE AND POST-TRAUMATIC INFECTIONS WITH MCC[DRG family]: “POSTOPERATIVE AND POST-TRAUMATIC INFECTIONS WITH MCC — same CMS DRG family (862-863), split by severity.”— CMS MS-DRG Definitions Manual (DRG family 862-863) · 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 20, 2026 · All releases and sources