156 MS-DRG: OTHER EAR, NOSE, MOUTH AND THROAT DIAGNOSES WITHOUT CC/MCC
MS-DRG 156 groups Medicare inpatient hospital stays for: OTHER EAR, NOSE, MOUTH AND THROAT DIAGNOSES WITHOUT CC/MCC. This is a medical MS-DRG. It falls under MDC 03 (Diseases and Disorders of the Ear, Nose, Mouth and Throat).
Payment & Classification Data
Official CMS values from the FY2027 IPPS Final Rule Table 5.
| Major Diagnostic Category | MDC 03 — Diseases and Disorders of the Ear, Nose, Mouth and Throat |
| DRG Type | Medical |
| Severity Level | None |
| Relative Weight | 0.6659 |
| Relative Weight (10% Cap Applied) | 0.6659 |
| Geometric Mean Length of Stay | 2.1 days |
| Arithmetic Mean Length of Stay | 2.6 days |
| Post-Acute Transfer DRG | No |
| Special Pay Transfer DRG | No |
Defining Codes (FY2027)
660 diagnosis codes can drive assignment here: A18.6, A36.0, A36.1, A36.2, A66.5, B00.1, B37.84, D10.4, D10.5, D10.6, D10.7, D10.9 and 648 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 156 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 03 — Diseases and Disorders of the Ear, Nose, Mouth and Throat[MDC]— CMS MS-DRG Definitions Manual · FY2027
Defining diagnoses (660)
- A18.6 — Tuberculosis of (inner) (middle) ear[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- A36.0 — Pharyngeal diphtheria[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- A36.1 — Nasopharyngeal diphtheria[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- A36.2 — Laryngeal diphtheria[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- A66.5 — Gangosa[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- B00.1 — Herpesviral vesicular dermatitis[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- B37.84 — Candidal otitis externa[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- D10.4 — Benign neoplasm of tonsil[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- and 652 more
DRG family
- DRG 154 — OTHER EAR, NOSE, MOUTH AND THROAT DIAGNOSES WITH MCC[DRG family]: “OTHER EAR, NOSE, MOUTH AND THROAT DIAGNOSES WITH MCC — same CMS DRG family (154-156), split by severity.”— CMS MS-DRG Definitions Manual (DRG family 154-156) · FY2027
- DRG 155 — OTHER EAR, NOSE, MOUTH AND THROAT DIAGNOSES WITH CC[DRG family]: “OTHER EAR, NOSE, MOUTH AND THROAT DIAGNOSES WITH CC — same CMS DRG family (154-156), split by severity.”— CMS MS-DRG Definitions Manual (DRG family 154-156) · 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