138 MS-DRG: MOUTH PROCEDURES WITHOUT CC/MCC
MS-DRG 138 groups Medicare inpatient hospital stays for: MOUTH PROCEDURES WITHOUT CC/MCC. This is a surgical 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 | Surgical |
| Severity Level | None |
| Relative Weight | 0.9188 |
| Relative Weight (10% Cap Applied) | 0.9188 |
| Geometric Mean Length of Stay | 1.7 days |
| Arithmetic Mean Length of Stay | 2.2 days |
| Post-Acute Transfer DRG | No |
| Special Pay Transfer DRG | No |
Defining Codes (FY2027)
358 procedure codes appear in its surgical logic (Mouth Procedures: 358): 0C00X7Z, 0C00XJZ, 0C00XKZ, 0C00XZZ, 0C01X7Z, 0C01XJZ, 0C01XKZ, 0C01XZZ, 0C500ZZ, 0C503ZZ, 0C50XZZ, 0C510ZZ and 346 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 03, this DRG ranks 4 of 5 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. Major Head and Neck Procedures (DRGs 140-142)
- 2. Other Ear, Nose, Mouth and Throat O.R. Procedures (DRGs 143-145)
- 3. Sinus and Mastoid Procedures (DRGs 135-136)
- 4. Mouth Procedures (DRGs 137-138) — this DRG
- 5. Salivary Gland Procedures (DRGs 139)
From the CMS MS-DRG Definitions Manual, Appendix D. Actual DRG assignment depends on the complete claim.
Contextual Map
Every relationship of 138 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 procedures (358)
- 0C00X7Z — Alteration of Upper Lip with Autologous Tissue Substitute, External Approach[Grouper procedure]— CMS MS-DRG Definitions Manual (Appendix E) · FY2027
- 0C00XJZ — Alteration of Upper Lip with Synthetic Substitute, External Approach[Grouper procedure]— CMS MS-DRG Definitions Manual (Appendix E) · FY2027
- 0C00XKZ — Alteration of Upper Lip with Nonautologous Tissue Substitute, External Approach[Grouper procedure]— CMS MS-DRG Definitions Manual (Appendix E) · FY2027
- 0C00XZZ — Alteration of Upper Lip, External Approach[Grouper procedure]— CMS MS-DRG Definitions Manual (Appendix E) · FY2027
- 0C01X7Z — Alteration of Lower Lip with Autologous Tissue Substitute, External Approach[Grouper procedure]— CMS MS-DRG Definitions Manual (Appendix E) · FY2027
- 0C01XJZ — Alteration of Lower Lip with Synthetic Substitute, External Approach[Grouper procedure]— CMS MS-DRG Definitions Manual (Appendix E) · FY2027
- 0C01XKZ — Alteration of Lower Lip with Nonautologous Tissue Substitute, External Approach[Grouper procedure]— CMS MS-DRG Definitions Manual (Appendix E) · FY2027
- 0C01XZZ — Alteration of Lower Lip, External Approach[Grouper procedure]— CMS MS-DRG Definitions Manual (Appendix E) · FY2027
- and 350 more
DRG family
- DRG 137 — MOUTH PROCEDURES WITH CC/MCC[DRG family]: “MOUTH PROCEDURES WITH CC/MCC — same CMS DRG family (137-138), split by severity.”— CMS MS-DRG Definitions Manual (DRG family 137-138) · 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