121 MS-DRG: ACUTE MAJOR EYE INFECTIONS WITH CC/MCC
MS-DRG 121 groups Medicare inpatient hospital stays for: ACUTE MAJOR EYE INFECTIONS WITH CC/MCC. This is a medical MS-DRG. It falls under MDC 02 (Diseases and Disorders of the Eye).
Payment & Classification Data
Official CMS values from the FY2027 IPPS Final Rule Table 5.
| Major Diagnostic Category | MDC 02 — Diseases and Disorders of the Eye |
| DRG Type | Medical |
| Severity Level | CC/MCC |
| Relative Weight | 1.2255 |
| Relative Weight (10% Cap Applied) | 1.2255 |
| Geometric Mean Length of Stay | 4.1 days |
| Arithmetic Mean Length of Stay | 5.6 days |
| Post-Acute Transfer DRG | No |
| Special Pay Transfer DRG | No |
Defining Codes (FY2027)
77 diagnosis codes can drive assignment here: H04.011, H04.012, H04.013, H04.019, H04.321, H04.322, H04.323, H04.329, H04.331, H04.332, H04.333, H04.339 and 65 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 121 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 02 — Diseases and Disorders of the Eye[MDC]— CMS MS-DRG Definitions Manual · FY2027
Defining diagnoses (77)
- H04.011 — Acute dacryoadenitis, right lacrimal gland[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- H04.012 — Acute dacryoadenitis, left lacrimal gland[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- H04.013 — Acute dacryoadenitis, bilateral lacrimal glands[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- H04.019 — Acute dacryoadenitis, unspecified lacrimal gland[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- H04.321 — Acute dacryocystitis of right lacrimal passage[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- H04.322 — Acute dacryocystitis of left lacrimal passage[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- H04.323 — Acute dacryocystitis of bilateral lacrimal passages[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- H04.329 — Acute dacryocystitis of unspecified lacrimal passage[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- and 69 more
DRG family
- DRG 122 — ACUTE MAJOR EYE INFECTIONS WITHOUT CC/MCC[DRG family]: “ACUTE MAJOR EYE INFECTIONS WITHOUT CC/MCC — same CMS DRG family (121-122), split by severity.”— CMS MS-DRG Definitions Manual (DRG family 121-122) · 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 · NCD code lists 2026-01 · LCD export September 20, 2026 · All releases and sources