100 MS-DRG: SEIZURES WITH MCC
MS-DRG 100 groups Medicare inpatient hospital stays for: SEIZURES WITH 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 | MCC |
| Relative Weight | 1.9233 |
| Relative Weight (10% Cap Applied) | 1.9233 |
| Geometric Mean Length of Stay | 4.3 days |
| Arithmetic Mean Length of Stay | 6.2 days |
| Post-Acute Transfer DRG | Yes |
| Special Pay Transfer DRG | No |
Defining Codes (FY2027)
62 diagnosis codes can drive assignment here: G40.001, G40.009, G40.011, G40.019, G40.101, G40.109, G40.111, G40.119, G40.201, G40.209, G40.211, G40.219 and 50 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 100 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 (62)
- G40.001 — Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, not intractable, with status epilepticus[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- G40.009 — Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, not intractable, without status epilepticus[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- G40.011 — Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, intractable, with status epilepticus[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- G40.019 — Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, intractable, without status epilepticus[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- G40.101 — Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures, not intractable, with status epilepticus[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- G40.109 — Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures, not intractable, without status epilepticus[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- G40.111 — Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures, intractable, with status epilepticus[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- G40.119 — Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures, intractable, without status epilepticus[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- and 54 more
DRG family
- DRG 101 — SEIZURES WITHOUT MCC[DRG family]: “SEIZURES WITHOUT MCC — same CMS DRG family (100-101), split by severity.”— CMS MS-DRG Definitions Manual (DRG family 100-101) · 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