MS-DRG · FY 2026 v43.0

MS-DRG 858 – Postoperative or Post-Traumatic Infections with O.R. Procedures without CC/MCC

A Surgical DRG in MDC 18 (Infectious & Parasitic Diseases, Systemic or Unspecified Sites). Its FY 2026 relative weight is 1.3929 with a geometric mean length of stay of 3.4 days.

Surgical DRG – assigned by operating-room procedure✓ Official CMS v43.0 dataset

1.3929

Relative Weight

3.4

Geometric Mean LOS (days)

4.2

Arithmetic Mean LOS (days)

Diagnosis Codes

Severity family

DRG 856with MCCWeight 4.5487 · GMLOS 9.1 days DRG 857with CCWeight 2.1415 · GMLOS 5.4 daysDRG 858without CC/MCCWeight 1.3929 · GMLOS 3.4 days

How a case is assigned to DRG 858

The grouper first assigns the case to MDC 18 from the principal diagnosis, then matches a qualifying operating-room procedure from the ICD-10-PCS list below (this is a Surgical DRG), then applies the severity split from secondary diagnoses: with MCC → 856; with CC → 857; without CC/MCC → 858.

ICD-10-PCS

Procedure Codes

Procedure codes do not drive assignment for this DRG.

ICD-10-CM

Qualifying Diagnosis Codes 11 codes · 5 categories

K68 Disorders of retroperitoneum1 code

K68.11 Postprocedural retroperitoneal abscess

N98 Complications associated with artificial fertilization1 code

N98.0 Infection associated with artificial insemination

T80 Complications following infusion, transfusion and therapeutic injection2 codes

T80.22XA Acute infection following transfusion, infusion, or injection of blood and blood products, initial encounter
T80.29XA Infection following other infusion, transfusion and therapeutic injection, initial encounter

T81 Complications of procedures, not elsewhere classified6 codes

T81.40XA Infection following a procedure, unspecified, initial encounter
T81.41XA Infection following a procedure, superficial incisional surgical site, initial encounter
T81.42XA Infection following a procedure, deep incisional surgical site, initial encounter
T81.43XA Infection following a procedure, organ and space surgical site, initial encounter
T81.44XA Sepsis following a procedure, initial encounter
T81.49XA Infection following a procedure, other surgical site, initial encounter

T88 Other complications of surgical and medical care, not elsewhere classified1 code

T88.0XXA Infection following immunization, initial encounter

Frequently Asked Questions

What is MS-DRG 858?

MS-DRG 858 (Postoperative or Post-Traumatic Infections with O.R. Procedures without CC/MCC) is a surgical DRG in MDC 18 (Infectious & Parasitic Diseases, Systemic or Unspecified Sites). Its FY 2026 relative weight is 1.3929 with a geometric mean length of stay of 3.4 days.

What is the difference between DRG 856, 857, 858?

All 3 share the same base category; the severity of secondary diagnoses separates them: 856 (with MCC), 857 (with CC), 858 (without CC/MCC). A major complication or comorbidity (MCC) places the case in the highest-weighted DRG of the family; a CC in the middle; neither in the lowest.

What is the relative weight of DRG 858?

The FY 2026 relative weight of this DRG is 1.3929, meaning reimbursement of roughly 1.39 times the average Medicare inpatient case. Multiply by a hospital's blended base rate for the approximate payment.

← PreviousDRG 857 – Postoperative or Post-Traumatic Infections with O.R Next →DRG 862 – Postoperative and Post-Traumatic Infections with MCC

Source: CMS ICD-10 MS-DRG v43.0 Definitions Manual and the FY 2026 IPPS Final Rule (Table 5), effective October 1, 2025 through September 30, 2026. We publish the DRG assignments as CMS defines them and add the navigation, search, and code links.