856 MS-DRG: POSTOPERATIVE OR POST-TRAUMATIC INFECTIONS WITH O.R. PROCEDURES WITH MCC
MS-DRG 856 groups Medicare inpatient hospital stays for: POSTOPERATIVE OR POST-TRAUMATIC INFECTIONS WITH O.R. PROCEDURES WITH MCC. This is a surgical 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 | Surgical |
| Severity Level | MCC |
| Relative Weight | 4.4826 |
| Relative Weight (10% Cap Applied) | 4.4826 |
| Geometric Mean Length of Stay | 8.8 days |
| Arithmetic Mean Length of Stay | 11.7 days |
| Post-Acute Transfer DRG | Yes |
| Special Pay Transfer DRG | No |
Defining Codes (FY2027)
11 diagnosis codes can drive assignment here: K68.11, N98.0, T80.22XA, T80.29XA, T81.40XA, T81.41XA, T81.42XA, T81.43XA, T81.44XA, T81.49XA, T88.0XXA.
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 18, this DRG ranks 1 of 2 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. Postoperative or Post-Traumatic Infections with O.R. Procedures (DRGs 856-858) — this DRG
- 2. Infectious and Parasitic Diseases with O.R. Procedures (DRGs 853-855)
From the CMS MS-DRG Definitions Manual, Appendix D. Actual DRG assignment depends on the complete claim.
Contextual Map
Every relationship of 856 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 (11)
- K68.11 — Postprocedural retroperitoneal abscess[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- N98.0 — Infection associated with artificial insemination[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- T80.22XA — Acute infection following transfusion, infusion, or injection of blood and blood products, initial encounter[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- T80.29XA — Infection following other infusion, transfusion and therapeutic injection, initial encounter[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
- and 3 more
DRG family
- DRG 857 — POSTOPERATIVE OR POST-TRAUMATIC INFECTIONS WITH O.R. PROCEDURES WITH CC[DRG family]: “POSTOPERATIVE OR POST-TRAUMATIC INFECTIONS WITH O.R. PROCEDURES WITH CC — same CMS DRG family (856-858), split by severity.”— CMS MS-DRG Definitions Manual (DRG family 856-858) · FY2027
- DRG 858 — POSTOPERATIVE OR POST-TRAUMATIC INFECTIONS WITH O.R. PROCEDURES WITHOUT CC/MCC[DRG family]: “POSTOPERATIVE OR POST-TRAUMATIC INFECTIONS WITH O.R. PROCEDURES WITHOUT CC/MCC — same CMS DRG family (856-858), split by severity.”— CMS MS-DRG Definitions Manual (DRG family 856-858) · 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