DRG 550
Medical DRGSeptic Arthritis without CC/MCC
What is MS-DRG 550?
MS-DRG 550 is a Medical Medicare Severity Diagnosis Related Group under Major Diagnostic Category 08 (MDC 08) without a significant Complication or Comorbidity. It maps to 155 ICD-10-CM diagnosis codes. For FY 2026 it carries a relative weight of 0.8741 with a geometric mean length of stay of 3.1 days and an arithmetic mean of 3.7 days. Hospitals use this grouping to determine reimbursement for inpatient stays under Medicare.
FY 2026 Payment Data
Official values from Table 5 of the FY 2026 IPPS Final Rule (CMS).
Related MS-DRGs in This Severity Group
The same clinical condition is split into separate DRGs by complication severity. MCC pays more than CC, which pays more than no CC/MCC.
Linked ICD-10-CM Diagnosis Mappings
- A02.23
Salmonella arthritis
BillableChapter 1 - A18.02
Tuberculous arthritis of other joints
BillableChapter 1 - A18.09
Other musculoskeletal tuberculosis
BillableChapter 1 - A39.83
Meningococcal arthritis
BillableChapter 1 - A39.84
Postmeningococcal arthritis
BillableChapter 1 - A54.40
Gonococcal infection of musculoskeletal system, unspecified
BillableChapter 1 - A54.42
Gonococcal arthritis
BillableChapter 1 - A54.43
Gonococcal osteomyelitis
BillableChapter 1 - A54.49
Gonococcal infection of other musculoskeletal tissue
BillableChapter 1 - A66.6
Bone and joint lesions of yaws
BillableChapter 1 - M00.00
Staphylococcal arthritis, unspecified joint
BillableChapter 13 - M00.011
Staphylococcal arthritis, right shoulder
BillableChapter 13 - M00.012
Staphylococcal arthritis, left shoulder
BillableChapter 13 - M00.019
Staphylococcal arthritis, unspecified shoulder
BillableChapter 13 - M00.021
Staphylococcal arthritis, right elbow
BillableChapter 13 - M00.022
Staphylococcal arthritis, left elbow
BillableChapter 13 - M00.029
Staphylococcal arthritis, unspecified elbow
BillableChapter 13 - M00.031
Staphylococcal arthritis, right wrist
BillableChapter 13 - M00.032
Staphylococcal arthritis, left wrist
BillableChapter 13 - M00.039
Staphylococcal arthritis, unspecified wrist
BillableChapter 13 - M00.041
Staphylococcal arthritis, right hand
BillableChapter 13 - M00.042
Staphylococcal arthritis, left hand
BillableChapter 13 - M00.049
Staphylococcal arthritis, unspecified hand
BillableChapter 13 - M00.051
Staphylococcal arthritis, right hip
BillableChapter 13 - M00.052
Staphylococcal arthritis, left hip
BillableChapter 13 - M00.059
Staphylococcal arthritis, unspecified hip
BillableChapter 13 - M00.061
Staphylococcal arthritis, right knee
BillableChapter 13 - M00.062
Staphylococcal arthritis, left knee
BillableChapter 13 - M00.069
Staphylococcal arthritis, unspecified knee
BillableChapter 13 - M00.071
Staphylococcal arthritis, right ankle and foot
BillableChapter 13 - M00.072
Staphylococcal arthritis, left ankle and foot
BillableChapter 13 - M00.079
Staphylococcal arthritis, unspecified ankle and foot
BillableChapter 13 - M00.08
Staphylococcal arthritis, vertebrae
BillableChapter 13 - M00.09
Staphylococcal polyarthritis
BillableChapter 13 - M00.10
Pneumococcal arthritis, unspecified joint
BillableChapter 13 - M00.111
Pneumococcal arthritis, right shoulder
BillableChapter 13 - M00.112
Pneumococcal arthritis, left shoulder
BillableChapter 13 - M00.119
Pneumococcal arthritis, unspecified shoulder
BillableChapter 13 - M00.121
Pneumococcal arthritis, right elbow
BillableChapter 13 - M00.122
Pneumococcal arthritis, left elbow
BillableChapter 13 - M00.129
Pneumococcal arthritis, unspecified elbow
BillableChapter 13 - M00.131
Pneumococcal arthritis, right wrist
BillableChapter 13 - M00.132
Pneumococcal arthritis, left wrist
BillableChapter 13 - M00.139
Pneumococcal arthritis, unspecified wrist
BillableChapter 13 - M00.141
Pneumococcal arthritis, right hand
BillableChapter 13 - M00.142
Pneumococcal arthritis, left hand
BillableChapter 13 - M00.149
Pneumococcal arthritis, unspecified hand
BillableChapter 13 - M00.151
Pneumococcal arthritis, right hip
BillableChapter 13 - M00.152
Pneumococcal arthritis, left hip
BillableChapter 13 - M00.159
Pneumococcal arthritis, unspecified hip
BillableChapter 13 - M00.161
Pneumococcal arthritis, right knee
BillableChapter 13 - M00.162
Pneumococcal arthritis, left knee
BillableChapter 13 - M00.169
Pneumococcal arthritis, unspecified knee
BillableChapter 13 - M00.171
Pneumococcal arthritis, right ankle and foot
BillableChapter 13 - M00.172
Pneumococcal arthritis, left ankle and foot
BillableChapter 13 - M00.179
Pneumococcal arthritis, unspecified ankle and foot
BillableChapter 13 - M00.18
Pneumococcal arthritis, vertebrae
BillableChapter 13 - M00.19
Pneumococcal polyarthritis
BillableChapter 13 - M00.20
Other streptococcal arthritis, unspecified joint
BillableChapter 13 - M00.211
Other streptococcal arthritis, right shoulder
BillableChapter 13 - M00.212
Other streptococcal arthritis, left shoulder
BillableChapter 13 - M00.219
Other streptococcal arthritis, unspecified shoulder
BillableChapter 13 - M00.221
Other streptococcal arthritis, right elbow
BillableChapter 13 - M00.222
Other streptococcal arthritis, left elbow
BillableChapter 13 - M00.229
Other streptococcal arthritis, unspecified elbow
BillableChapter 13 - M00.231
Other streptococcal arthritis, right wrist
BillableChapter 13 - M00.232
Other streptococcal arthritis, left wrist
BillableChapter 13 - M00.239
Other streptococcal arthritis, unspecified wrist
BillableChapter 13 - M00.241
Other streptococcal arthritis, right hand
BillableChapter 13 - M00.242
Other streptococcal arthritis, left hand
BillableChapter 13 - M00.249
Other streptococcal arthritis, unspecified hand
BillableChapter 13 - M00.251
Other streptococcal arthritis, right hip
BillableChapter 13 - M00.252
Other streptococcal arthritis, left hip
BillableChapter 13 - M00.259
Other streptococcal arthritis, unspecified hip
BillableChapter 13 - M00.261
Other streptococcal arthritis, right knee
BillableChapter 13 - M00.262
Other streptococcal arthritis, left knee
BillableChapter 13 - M00.269
Other streptococcal arthritis, unspecified knee
BillableChapter 13 - M00.271
Other streptococcal arthritis, right ankle and foot
BillableChapter 13 - M00.272
Other streptococcal arthritis, left ankle and foot
BillableChapter 13 - M00.279
Other streptococcal arthritis, unspecified ankle and foot
BillableChapter 13 - M00.28
Other streptococcal arthritis, vertebrae
BillableChapter 13 - M00.29
Other streptococcal polyarthritis
BillableChapter 13 - M00.80
Arthritis due to other bacteria, unspecified joint
BillableChapter 13 - M00.811
Arthritis due to other bacteria, right shoulder
BillableChapter 13 - M00.812
Arthritis due to other bacteria, left shoulder
BillableChapter 13 - M00.819
Arthritis due to other bacteria, unspecified shoulder
BillableChapter 13 - M00.821
Arthritis due to other bacteria, right elbow
BillableChapter 13 - M00.822
Arthritis due to other bacteria, left elbow
BillableChapter 13 - M00.829
Arthritis due to other bacteria, unspecified elbow
BillableChapter 13 - M00.831
Arthritis due to other bacteria, right wrist
BillableChapter 13 - M00.832
Arthritis due to other bacteria, left wrist
BillableChapter 13 - M00.839
Arthritis due to other bacteria, unspecified wrist
BillableChapter 13 - M00.841
Arthritis due to other bacteria, right hand
BillableChapter 13 - M00.842
Arthritis due to other bacteria, left hand
BillableChapter 13 - M00.849
Arthritis due to other bacteria, unspecified hand
BillableChapter 13 - M00.851
Arthritis due to other bacteria, right hip
BillableChapter 13 - M00.852
Arthritis due to other bacteria, left hip
BillableChapter 13 - M00.859
Arthritis due to other bacteria, unspecified hip
BillableChapter 13 - M00.861
Arthritis due to other bacteria, right knee
BillableChapter 13 - M00.862
Arthritis due to other bacteria, left knee
BillableChapter 13 - M00.869
Arthritis due to other bacteria, unspecified knee
BillableChapter 13 - M00.871
Arthritis due to other bacteria, right ankle and foot
BillableChapter 13 - M00.872
Arthritis due to other bacteria, left ankle and foot
BillableChapter 13 - M00.879
Arthritis due to other bacteria, unspecified ankle and foot
BillableChapter 13 - M00.88
Arthritis due to other bacteria, vertebrae
BillableChapter 13 - M00.89
Polyarthritis due to other bacteria
BillableChapter 13 - M00.9
Pyogenic arthritis, unspecified
BillableChapter 13 - M01.X0
Direct infection of unspecified joint in infectious and parasitic diseases classified elsewhere
BillableChapter 13 - M01.X11
Direct infection of right shoulder in infectious and parasitic diseases classified elsewhere
BillableChapter 13 - M01.X12
Direct infection of left shoulder in infectious and parasitic diseases classified elsewhere
BillableChapter 13 - M01.X19
Direct infection of unspecified shoulder in infectious and parasitic diseases classified elsewhere
BillableChapter 13 - M01.X21
Direct infection of right elbow in infectious and parasitic diseases classified elsewhere
BillableChapter 13 - M01.X22
Direct infection of left elbow in infectious and parasitic diseases classified elsewhere
BillableChapter 13 - M01.X29
Direct infection of unspecified elbow in infectious and parasitic diseases classified elsewhere
BillableChapter 13 - M01.X31
Direct infection of right wrist in infectious and parasitic diseases classified elsewhere
BillableChapter 13 - M01.X32
Direct infection of left wrist in infectious and parasitic diseases classified elsewhere
BillableChapter 13 - M01.X39
Direct infection of unspecified wrist in infectious and parasitic diseases classified elsewhere
BillableChapter 13 - M01.X41
Direct infection of right hand in infectious and parasitic diseases classified elsewhere
BillableChapter 13 - M01.X42
Direct infection of left hand in infectious and parasitic diseases classified elsewhere
BillableChapter 13 - M01.X49
Direct infection of unspecified hand in infectious and parasitic diseases classified elsewhere
BillableChapter 13 - M01.X51
Direct infection of right hip in infectious and parasitic diseases classified elsewhere
BillableChapter 13 - M01.X52
Direct infection of left hip in infectious and parasitic diseases classified elsewhere
BillableChapter 13 - M01.X59
Direct infection of unspecified hip in infectious and parasitic diseases classified elsewhere
BillableChapter 13 - M01.X61
Direct infection of right knee in infectious and parasitic diseases classified elsewhere
BillableChapter 13 - M01.X62
Direct infection of left knee in infectious and parasitic diseases classified elsewhere
BillableChapter 13 - M01.X69
Direct infection of unspecified knee in infectious and parasitic diseases classified elsewhere
BillableChapter 13 - M01.X71
Direct infection of right ankle and foot in infectious and parasitic diseases classified elsewhere
BillableChapter 13 - M01.X72
Direct infection of left ankle and foot in infectious and parasitic diseases classified elsewhere
BillableChapter 13 - M01.X79
Direct infection of unspecified ankle and foot in infectious and parasitic diseases classified elsewhere
BillableChapter 13 - M01.X8
Direct infection of vertebrae in infectious and parasitic diseases classified elsewhere
BillableChapter 13 - M01.X9
Direct infection of multiple joints in infectious and parasitic diseases classified elsewhere
BillableChapter 13 - M02.80
Other reactive arthropathies, unspecified site
BillableChapter 13 - M02.811
Other reactive arthropathies, right shoulder
BillableChapter 13 - M02.812
Other reactive arthropathies, left shoulder
BillableChapter 13 - M02.819
Other reactive arthropathies, unspecified shoulder
BillableChapter 13 - M02.821
Other reactive arthropathies, right elbow
BillableChapter 13 - M02.822
Other reactive arthropathies, left elbow
BillableChapter 13 - M02.829
Other reactive arthropathies, unspecified elbow
BillableChapter 13 - M02.831
Other reactive arthropathies, right wrist
BillableChapter 13 - M02.832
Other reactive arthropathies, left wrist
BillableChapter 13 - M02.839
Other reactive arthropathies, unspecified wrist
BillableChapter 13 - M02.841
Other reactive arthropathies, right hand
BillableChapter 13 - M02.842
Other reactive arthropathies, left hand
BillableChapter 13 - M02.849
Other reactive arthropathies, unspecified hand
BillableChapter 13 - M02.851
Other reactive arthropathies, right hip
BillableChapter 13 - M02.852
Other reactive arthropathies, left hip
BillableChapter 13 - M02.859
Other reactive arthropathies, unspecified hip
BillableChapter 13 - M02.861
Other reactive arthropathies, right knee
BillableChapter 13 - M02.862
Other reactive arthropathies, left knee
BillableChapter 13 - M02.869
Other reactive arthropathies, unspecified knee
BillableChapter 13 - M02.871
Other reactive arthropathies, right ankle and foot
BillableChapter 13 - M02.872
Other reactive arthropathies, left ankle and foot
BillableChapter 13 - M02.879
Other reactive arthropathies, unspecified ankle and foot
BillableChapter 13 - M02.88
Other reactive arthropathies, vertebrae
BillableChapter 13 - M02.89
Other reactive arthropathies, multiple sites
BillableChapter 13