MS-DRG 399 – Appendix Procedures without CC/MCC
A Surgical DRG in MDC 06 (Diseases & Disorders of the Digestive System). Inpatient cases group to DRG 399 when one of the 57 ICD-10-PCS operating-room procedures listed below is reported. Its FY 2026 relative weight is 1.1447 with a geometric mean length of stay of 1.8 days.
Severity family
The grouper first assigns the case to MDC 06 from the principal diagnosis, then matches a qualifying operating-room procedure from the ICD-10-PCS list below (this is a Surgical DRG), then applies the severity split from secondary diagnoses: with MCC → 397; with CC → 398; without CC/MCC → 399.
Procedure Codes 57 codes · 9 categories
0D5J Gastrointestinal System, Destruction8 codes
- 0D5J0Z3 Destruction of Appendix using Laser Interstitial Thermal Therapy, Open Approach
- 0D5J0ZZ Destruction of Appendix, Open Approach
- 0D5J3Z3 Destruction of Appendix using Laser Interstitial Thermal Therapy, Percutaneous Approach
- 0D5J3ZZ Destruction of Appendix, Percutaneous Approach
- 0D5J4Z3 Destruction of Appendix using Laser Interstitial Thermal Therapy, Percutaneous Endoscopic Approach
- 0D5J4ZZ Destruction of Appendix, Percutaneous Endoscopic Approach
- 0D5J7ZZ Destruction of Appendix, Via Natural or Artificial Opening
- 0D5J8ZZ Destruction of Appendix, Via Natural or Artificial Opening Endoscopic
0D9J Gastrointestinal System, Drainage13 codes
- 0D9J00Z Drainage of Appendix with Drainage Device, Open Approach
- 0D9J0ZX Drainage of Appendix, Open Approach, Diagnostic
- 0D9J0ZZ Drainage of Appendix, Open Approach
- 0D9J3ZX Drainage of Appendix, Percutaneous Approach, Diagnostic
- 0D9J40Z Drainage of Appendix with Drainage Device, Percutaneous Endoscopic Approach
- 0D9J4ZX Drainage of Appendix, Percutaneous Endoscopic Approach, Diagnostic
- 0D9J4ZZ Drainage of Appendix, Percutaneous Endoscopic Approach
- 0D9J70Z Drainage of Appendix with Drainage Device, Via Natural or Artificial Opening
- 0D9J7ZX Drainage of Appendix, Via Natural or Artificial Opening, Diagnostic
- 0D9J7ZZ Drainage of Appendix, Via Natural or Artificial Opening
- 0D9J80Z Drainage of Appendix with Drainage Device, Via Natural or Artificial Opening Endoscopic
- 0D9J8ZX Drainage of Appendix, Via Natural or Artificial Opening Endoscopic, Diagnostic
- 0D9J8ZZ Drainage of Appendix, Via Natural or Artificial Opening Endoscopic
0DBJ Gastrointestinal System, Excision11 codes
- 0DBJ0ZX Excision of Appendix, Open Approach, Diagnostic
- 0DBJ0ZZ Excision of Appendix, Open Approach
- 0DBJ3ZX Excision of Appendix, Percutaneous Approach, Diagnostic
- 0DBJ3ZZ Excision of Appendix, Percutaneous Approach
- 0DBJ4ZG Excision of Appendix, Percutaneous Endoscopic Approach, Hand-Assisted
- 0DBJ4ZX Excision of Appendix, Percutaneous Endoscopic Approach, Diagnostic
- 0DBJ4ZZ Excision of Appendix, Percutaneous Endoscopic Approach
- 0DBJ7ZX Excision of Appendix, Via Natural or Artificial Opening, Diagnostic
- 0DBJ7ZZ Excision of Appendix, Via Natural or Artificial Opening
- 0DBJ8ZX Excision of Appendix, Via Natural or Artificial Opening Endoscopic, Diagnostic
- 0DBJ8ZZ Excision of Appendix, Via Natural or Artificial Opening Endoscopic
0DCJ Gastrointestinal System, Extirpation5 codes
- 0DCJ0ZZ Extirpation of Matter from Appendix, Open Approach
- 0DCJ3ZZ Extirpation of Matter from Appendix, Percutaneous Approach
- 0DCJ4ZZ Extirpation of Matter from Appendix, Percutaneous Endoscopic Approach
- 0DCJ7ZZ Extirpation of Matter from Appendix, Via Natural or Artificial Opening
- 0DCJ8ZZ Extirpation of Matter from Appendix, Via Natural or Artificial Opening Endoscopic
0DDJ Gastrointestinal System, Extraction3 codes
0DFJ Gastrointestinal System, Fragmentation5 codes
- 0DFJ0ZZ Fragmentation in Appendix, Open Approach
- 0DFJ3ZZ Fragmentation in Appendix, Percutaneous Approach
- 0DFJ4ZZ Fragmentation in Appendix, Percutaneous Endoscopic Approach
- 0DFJ7ZZ Fragmentation in Appendix, Via Natural or Artificial Opening
- 0DFJ8ZZ Fragmentation in Appendix, Via Natural or Artificial Opening Endoscopic
0DNJ Gastrointestinal System, Release2 codes
0DQJ Gastrointestinal System, Repair5 codes
0DTJ Gastrointestinal System, Resection5 codes
- 0DTJ0ZZ Resection of Appendix, Open Approach
- 0DTJ4ZG Resection of Appendix, Percutaneous Endoscopic Approach, Hand-Assisted
- 0DTJ4ZZ Resection of Appendix, Percutaneous Endoscopic Approach
- 0DTJ7ZZ Resection of Appendix, Via Natural or Artificial Opening
- 0DTJ8ZZ Resection of Appendix, Via Natural or Artificial Opening Endoscopic
Qualifying Diagnosis Codes
Frequently Asked Questions
What is MS-DRG 399?
MS-DRG 399 (Appendix Procedures without CC/MCC) is a surgical DRG in MDC 06 (Diseases & Disorders of the Digestive System). Its FY 2026 relative weight is 1.1447 with a geometric mean length of stay of 1.8 days.
What is the difference between DRG 397, 398, 399?
All 3 share the same base category; the severity of secondary diagnoses separates them: 397 (with MCC), 398 (with CC), 399 (without CC/MCC). A major complication or comorbidity (MCC) places the case in the highest-weighted DRG of the family; a CC in the middle; neither in the lowest.
How many procedure codes group to DRG 399?
57 ICD-10-PCS operating-room procedure codes group to this DRG.
What is the relative weight of DRG 399?
The FY 2026 relative weight of this DRG is 1.1447, meaning reimbursement of roughly 1.14 times the average Medicare inpatient case. Multiply by a hospital's blended base rate for the approximate payment.
