179 MS-DRG: RESPIRATORY INFECTIONS AND INFLAMMATIONS WITHOUT CC/MCC
MS-DRG 179 groups Medicare inpatient hospital stays for: RESPIRATORY INFECTIONS AND INFLAMMATIONS WITHOUT CC/MCC. This is a medical MS-DRG. It falls under MDC 04 (Diseases and Disorders of the Respiratory System).
Payment & Classification Data
Official CMS values from the FY2027 IPPS Final Rule Table 5.
| Major Diagnostic Category | MDC 04 — Diseases and Disorders of the Respiratory System |
| DRG Type | Medical |
| Severity Level | None |
| Relative Weight | 0.7345 |
| Relative Weight (10% Cap Applied) | 0.7345 |
| Geometric Mean Length of Stay | 2.4 days |
| Arithmetic Mean Length of Stay | 3 days |
| Post-Acute Transfer DRG | Yes |
| Special Pay Transfer DRG | No |
Defining Codes (FY2027)
64 diagnosis codes can drive assignment here: A02.22, A06.5, A15.0, A15.4, A15.5, A15.6, A15.7, A15.8, A15.9, A20.2, A21.2, A22.1 and 52 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.
Contextual Map
Every relationship of 179 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 04 — Diseases and Disorders of the Respiratory System[MDC]— CMS MS-DRG Definitions Manual · FY2027
Defining diagnoses (64)
- A02.22 — Salmonella pneumonia[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- A06.5 — Amebic lung abscess[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- A15.0 — Tuberculosis of lung[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- A15.4 — Tuberculosis of intrathoracic lymph nodes[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- A15.5 — Tuberculosis of larynx, trachea and bronchus[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- A15.6 — Tuberculous pleurisy[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- A15.7 — Primary respiratory tuberculosis[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- A15.8 — Other respiratory tuberculosis[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- and 56 more
DRG family
- DRG 177 — RESPIRATORY INFECTIONS AND INFLAMMATIONS WITH MCC[DRG family]: “RESPIRATORY INFECTIONS AND INFLAMMATIONS WITH MCC — same CMS DRG family (177-179), split by severity.”— CMS MS-DRG Definitions Manual (DRG family 177-179) · FY2027
- DRG 178 — RESPIRATORY INFECTIONS AND INFLAMMATIONS WITH CC[DRG family]: “RESPIRATORY INFECTIONS AND INFLAMMATIONS WITH CC — same CMS DRG family (177-179), split by severity.”— CMS MS-DRG Definitions Manual (DRG family 177-179) · 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