027 MS-DRG: CRANIOTOMY AND ENDOVASCULAR INTRACRANIAL PROCEDURES WITHOUT CC/MCC
MS-DRG 027 groups Medicare inpatient hospital stays for: CRANIOTOMY AND ENDOVASCULAR INTRACRANIAL PROCEDURES WITHOUT CC/MCC. This is a surgical 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 | Surgical |
| Severity Level | None |
| Relative Weight | 2.6339 |
| Relative Weight (10% Cap Applied) | 2.6339 |
| Geometric Mean Length of Stay | 1.5 days |
| Arithmetic Mean Length of Stay | 1.9 days |
| Post-Acute Transfer DRG | Yes |
| Special Pay Transfer DRG | No |
Defining Codes (FY2027)
1,429 procedure codes appear in its surgical logic (Craniotomy and endovascular intracranial procedures: 1,429): 001607A, 001607B, 00160JA, 00160JB, 00160KA, 00160KB, 00160ZB, 001637A, 001637B, 00163JA, 00163JB, 00163KA and 1,417 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.
Surgical Precedence (FY2027)
Within MDC 01, this DRG ranks 3 of 8 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. Intracranial Vascular Procedures with Principal Diagnosis Hemorrhage (DRGs 020-022)
- 2. Craniotomy with Major Device Implant or Acute Complex CNS Principal Diagnosis (DRGs 023-024)
- 3. Craniotomy and Endovascular Intracranial Procedures (DRGs 025-027) — this DRG
- 4. Spinal Procedures (DRGs 028-030)
- 5. Ventricular Shunt Procedures (DRGs 031-033)
- 6. Carotid Artery Stent Procedures (DRGs 034-036)
- 7. Extracranial Procedures (DRGs 037-039)
- 8. Peripheral, Cranial Nerve and Other Nervous System Procedures (DRGs 040-042)
From the CMS MS-DRG Definitions Manual, Appendix D. Actual DRG assignment depends on the complete claim.
Contextual Map
Every relationship of 027 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 procedures (1429)
- 001607A — Bypass Cerebral Ventricle to Subgaleal Space with Autologous Tissue Substitute, Open Approach[Grouper procedure]— CMS MS-DRG Definitions Manual (Appendix E) · FY2027
- 001607B — Bypass Cerebral Ventricle to Cerebral Cisterns with Autologous Tissue Substitute, Open Approach[Grouper procedure]— CMS MS-DRG Definitions Manual (Appendix E) · FY2027
- 00160JA — Bypass Cerebral Ventricle to Subgaleal Space with Synthetic Substitute, Open Approach[Grouper procedure]— CMS MS-DRG Definitions Manual (Appendix E) · FY2027
- 00160JB — Bypass Cerebral Ventricle to Cerebral Cisterns with Synthetic Substitute, Open Approach[Grouper procedure]— CMS MS-DRG Definitions Manual (Appendix E) · FY2027
- 00160KA — Bypass Cerebral Ventricle to Subgaleal Space with Nonautologous Tissue Substitute, Open Approach[Grouper procedure]— CMS MS-DRG Definitions Manual (Appendix E) · FY2027
- 00160KB — Bypass Cerebral Ventricle to Cerebral Cisterns with Nonautologous Tissue Substitute, Open Approach[Grouper procedure]— CMS MS-DRG Definitions Manual (Appendix E) · FY2027
- 00160ZB — Bypass Cerebral Ventricle to Cerebral Cisterns, Open Approach[Grouper procedure]— CMS MS-DRG Definitions Manual (Appendix E) · FY2027
- 001637A — Bypass Cerebral Ventricle to Subgaleal Space with Autologous Tissue Substitute, Percutaneous Approach[Grouper procedure]— CMS MS-DRG Definitions Manual (Appendix E) · FY2027
- and 1421 more
DRG family
- DRG 025 — CRANIOTOMY AND ENDOVASCULAR INTRACRANIAL PROCEDURES WITH MCC[DRG family]: “CRANIOTOMY AND ENDOVASCULAR INTRACRANIAL PROCEDURES WITH MCC — same CMS DRG family (025-027), split by severity.”— CMS MS-DRG Definitions Manual (DRG family 025-027) · FY2027
- DRG 026 — CRANIOTOMY AND ENDOVASCULAR INTRACRANIAL PROCEDURES WITH CC[DRG family]: “CRANIOTOMY AND ENDOVASCULAR INTRACRANIAL PROCEDURES WITH CC — same CMS DRG family (025-027), split by severity.”— CMS MS-DRG Definitions Manual (DRG family 025-027) · 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