055 MS-DRG: NERVOUS SYSTEM NEOPLASMS WITHOUT MCC
MS-DRG 055 groups Medicare inpatient hospital stays for: NERVOUS SYSTEM NEOPLASMS WITHOUT MCC. This is a medical MS-DRG. It falls under MDC 01 (Diseases and Disorders of the Nervous System).
Payment & Classification Data
Official CMS values from the FY2027 IPPS Final Rule Table 5.
| Major Diagnostic Category | MDC 01 — Diseases and Disorders of the Nervous System |
| DRG Type | Medical |
| Severity Level | None |
| Relative Weight | 1.0296 |
| Relative Weight (10% Cap Applied) | 1.0296 |
| Geometric Mean Length of Stay | 2.9 days |
| Arithmetic Mean Length of Stay | 3.9 days |
| Post-Acute Transfer DRG | Yes |
| Special Pay Transfer DRG | No |
Defining Codes (FY2027)
61 diagnosis codes can drive assignment here: C70.0, C70.1, C70.9, C71.0, C71.1, C71.2, C71.3, C71.4, C71.5, C71.6, C71.7, C71.8 and 49 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 055 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 01 — Diseases and Disorders of the Nervous System[MDC]— CMS MS-DRG Definitions Manual · FY2027
Defining diagnoses (61)
- C70.0 — Malignant neoplasm of cerebral meninges[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- C70.1 — Malignant neoplasm of spinal meninges[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- C70.9 — Malignant neoplasm of meninges, unspecified[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- C71.0 — Malignant neoplasm of cerebrum, except lobes and ventricles[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- C71.1 — Malignant neoplasm of frontal lobe[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- C71.2 — Malignant neoplasm of temporal lobe[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- C71.3 — Malignant neoplasm of parietal lobe[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- C71.4 — Malignant neoplasm of occipital lobe[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- and 53 more
DRG family
- DRG 054 — NERVOUS SYSTEM NEOPLASMS WITH MCC[DRG family]: “NERVOUS SYSTEM NEOPLASMS WITH MCC — same CMS DRG family (054-055), split by severity.”— CMS MS-DRG Definitions Manual (DRG family 054-055) · 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