MS-DRG · FY 2026 v43.0
MS-DRG 555 – Signs and Symptoms of Musculoskeletal System and Connective Tissue with MCC
A Medical DRG in MDC 08 (Diseases & Disorders of the Musculoskeletal System & Connective Tissue). Inpatient cases group to DRG 555 when the ICD-10-CM principal diagnosis is one of the 247 codes listed below and a secondary diagnosis on the major complication or comorbidity (MCC) list is present. Its FY 2026 relative weight is 1.3218 with a geometric mean length of stay of 3.8 days.
Medical DRG – assigned by principal diagnosis✓ Official CMS v43.0 dataset
1.3218
Relative Weight
3.8
Geometric Mean LOS (days)
5.2
Arithmetic Mean LOS (days)
247
Principal Diagnosis Codes
Severity family
DRG 555with MCCWeight 1.3218 · GMLOS 3.8 daysDRG 556without MCCWeight 0.8306 · GMLOS 2.7 days
How a case is assigned to DRG 555
The grouper first assigns the case to MDC 08 from the principal diagnosis and finds no qualifying operating-room procedure (this is a Medical DRG; ICD-10-PCS codes do not drive assignment here), then applies the severity split from secondary diagnoses: with MCC → 555; without MCC → 556.
ICD-10-CM
Principal Diagnosis Codes 247 codes · 8 categories
247 of 247 shown
M25 Other joint disorder, not elsewhere classified98 codes
- M25.10 Fistula, unspecified joint
- M25.111 Fistula, right shoulder
- M25.112 Fistula, left shoulder
- M25.119 Fistula, unspecified shoulder
- M25.121 Fistula, right elbow
- M25.122 Fistula, left elbow
- M25.129 Fistula, unspecified elbow
- M25.131 Fistula, right wrist
- M25.132 Fistula, left wrist
- M25.139 Fistula, unspecified wrist
- M25.141 Fistula, right hand
- M25.142 Fistula, left hand
- M25.149 Fistula, unspecified hand
- M25.151 Fistula, right hip
- M25.152 Fistula, left hip
- M25.159 Fistula, unspecified hip
- M25.161 Fistula, right knee
- M25.162 Fistula, left knee
- M25.169 Fistula, unspecified knee
- M25.171 Fistula, right ankle
- M25.172 Fistula, left ankle
- M25.173 Fistula, unspecified ankle
- M25.174 Fistula, right foot
- M25.175 Fistula, left foot
- M25.176 Fistula, unspecified foot
- M25.18 Fistula, other specified site
- M25.50 Pain in unspecified joint
- M25.511 Pain in right shoulder
- M25.512 Pain in left shoulder
- M25.519 Pain in unspecified shoulder
- M25.521 Pain in right elbow
- M25.522 Pain in left elbow
- M25.529 Pain in unspecified elbow
- M25.531 Pain in right wrist
- M25.532 Pain in left wrist
- M25.539 Pain in unspecified wrist
- M25.541 Pain in joints of right hand
- M25.542 Pain in joints of left hand
- M25.549 Pain in joints of unspecified hand
- M25.551 Pain in right hip
- M25.552 Pain in left hip
- M25.559 Pain in unspecified hip
- M25.561 Pain in right knee
- M25.562 Pain in left knee
- M25.569 Pain in unspecified knee
- M25.571 Pain in right ankle and joints of right foot
- M25.572 Pain in left ankle and joints of left foot
- M25.579 Pain in unspecified ankle and joints of unspecified foot
- M25.59 Pain in other specified joint
- M25.60 Stiffness of unspecified joint, not elsewhere classified
- M25.611 Stiffness of right shoulder, not elsewhere classified
- M25.612 Stiffness of left shoulder, not elsewhere classified
- M25.619 Stiffness of unspecified shoulder, not elsewhere classified
- M25.621 Stiffness of right elbow, not elsewhere classified
- M25.622 Stiffness of left elbow, not elsewhere classified
- M25.629 Stiffness of unspecified elbow, not elsewhere classified
- M25.631 Stiffness of right wrist, not elsewhere classified
- M25.632 Stiffness of left wrist, not elsewhere classified
- M25.639 Stiffness of unspecified wrist, not elsewhere classified
- M25.641 Stiffness of right hand, not elsewhere classified
- M25.642 Stiffness of left hand, not elsewhere classified
- M25.649 Stiffness of unspecified hand, not elsewhere classified
- M25.651 Stiffness of right hip, not elsewhere classified
- M25.652 Stiffness of left hip, not elsewhere classified
- M25.659 Stiffness of unspecified hip, not elsewhere classified
- M25.661 Stiffness of right knee, not elsewhere classified
- M25.662 Stiffness of left knee, not elsewhere classified
- M25.669 Stiffness of unspecified knee, not elsewhere classified
- M25.671 Stiffness of right ankle, not elsewhere classified
- M25.672 Stiffness of left ankle, not elsewhere classified
- M25.673 Stiffness of unspecified ankle, not elsewhere classified
- M25.674 Stiffness of right foot, not elsewhere classified
- M25.675 Stiffness of left foot, not elsewhere classified
- M25.676 Stiffness of unspecified foot, not elsewhere classified
- M25.69 Stiffness of other specified joint, not elsewhere classified
- M25.80 Other specified joint disorders, unspecified joint
- M25.811 Other specified joint disorders, right shoulder
- M25.812 Other specified joint disorders, left shoulder
- M25.819 Other specified joint disorders, unspecified shoulder
- M25.821 Other specified joint disorders, right elbow
- M25.822 Other specified joint disorders, left elbow
- M25.829 Other specified joint disorders, unspecified elbow
- M25.831 Other specified joint disorders, right wrist
- M25.832 Other specified joint disorders, left wrist
- M25.839 Other specified joint disorders, unspecified wrist
- M25.841 Other specified joint disorders, right hand
- M25.842 Other specified joint disorders, left hand
- M25.849 Other specified joint disorders, unspecified hand
- M25.851 Other specified joint disorders, right hip
- M25.852 Other specified joint disorders, left hip
- M25.859 Other specified joint disorders, unspecified hip
- M25.861 Other specified joint disorders, right knee
- M25.862 Other specified joint disorders, left knee
- M25.869 Other specified joint disorders, unspecified knee
- M25.871 Other specified joint disorders, right ankle and foot
- M25.872 Other specified joint disorders, left ankle and foot
- M25.879 Other specified joint disorders, unspecified ankle and foot
- M25.9 Joint disorder, unspecified
M60 Myositis25 codes
- M60.80 Other myositis, unspecified site
- M60.811 Other myositis, right shoulder
- M60.812 Other myositis, left shoulder
- M60.819 Other myositis, unspecified shoulder
- M60.821 Other myositis, right upper arm
- M60.822 Other myositis, left upper arm
- M60.829 Other myositis, unspecified upper arm
- M60.831 Other myositis, right forearm
- M60.832 Other myositis, left forearm
- M60.839 Other myositis, unspecified forearm
- M60.841 Other myositis, right hand
- M60.842 Other myositis, left hand
- M60.849 Other myositis, unspecified hand
- M60.851 Other myositis, right thigh
- M60.852 Other myositis, left thigh
- M60.859 Other myositis, unspecified thigh
- M60.861 Other myositis, right lower leg
- M60.862 Other myositis, left lower leg
- M60.869 Other myositis, unspecified lower leg
- M60.871 Other myositis, right ankle and foot
- M60.872 Other myositis, left ankle and foot
- M60.879 Other myositis, unspecified ankle and foot
- M60.88 Other myositis, other site
- M60.89 Other myositis, multiple sites
- M60.9 Myositis, unspecified
M62 Other disorders of muscle27 codes
- M62.40 Contracture of muscle, unspecified site
- M62.411 Contracture of muscle, right shoulder
- M62.412 Contracture of muscle, left shoulder
- M62.419 Contracture of muscle, unspecified shoulder
- M62.421 Contracture of muscle, right upper arm
- M62.422 Contracture of muscle, left upper arm
- M62.429 Contracture of muscle, unspecified upper arm
- M62.431 Contracture of muscle, right forearm
- M62.432 Contracture of muscle, left forearm
- M62.439 Contracture of muscle, unspecified forearm
- M62.441 Contracture of muscle, right hand
- M62.442 Contracture of muscle, left hand
- M62.449 Contracture of muscle, unspecified hand
- M62.451 Contracture of muscle, right thigh
- M62.452 Contracture of muscle, left thigh
- M62.459 Contracture of muscle, unspecified thigh
- M62.461 Contracture of muscle, right lower leg
- M62.462 Contracture of muscle, left lower leg
- M62.469 Contracture of muscle, unspecified lower leg
- M62.471 Contracture of muscle, right ankle and foot
- M62.472 Contracture of muscle, left ankle and foot
- M62.479 Contracture of muscle, unspecified ankle and foot
- M62.48 Contracture of muscle, other site
- M62.49 Contracture of muscle, multiple sites
- M62.81 Muscle weakness (generalized)
- M62.831 Muscle spasm of calf
- M62.838 Other muscle spasm
M70 Soft tissue disorders related to use, overuse and pressure48 codes
- M70.80 Other soft tissue disorders related to use, overuse and pressure of unspecified site
- M70.811 Other soft tissue disorders related to use, overuse and pressure, right shoulder
- M70.812 Other soft tissue disorders related to use, overuse and pressure, left shoulder
- M70.819 Other soft tissue disorders related to use, overuse and pressure, unspecified shoulder
- M70.821 Other soft tissue disorders related to use, overuse and pressure, right upper arm
- M70.822 Other soft tissue disorders related to use, overuse and pressure, left upper arm
- M70.829 Other soft tissue disorders related to use, overuse and pressure, unspecified upper arms
- M70.831 Other soft tissue disorders related to use, overuse and pressure, right forearm
- M70.832 Other soft tissue disorders related to use, overuse and pressure, left forearm
- M70.839 Other soft tissue disorders related to use, overuse and pressure, unspecified forearm
- M70.841 Other soft tissue disorders related to use, overuse and pressure, right hand
- M70.842 Other soft tissue disorders related to use, overuse and pressure, left hand
- M70.849 Other soft tissue disorders related to use, overuse and pressure, unspecified hand
- M70.851 Other soft tissue disorders related to use, overuse and pressure, right thigh
- M70.852 Other soft tissue disorders related to use, overuse and pressure, left thigh
- M70.859 Other soft tissue disorders related to use, overuse and pressure, unspecified thigh
- M70.861 Other soft tissue disorders related to use, overuse and pressure, right lower leg
- M70.862 Other soft tissue disorders related to use, overuse and pressure, left lower leg
- M70.869 Other soft tissue disorders related to use, overuse and pressure, unspecified leg
- M70.871 Other soft tissue disorders related to use, overuse and pressure, right ankle and foot
- M70.872 Other soft tissue disorders related to use, overuse and pressure, left ankle and foot
- M70.879 Other soft tissue disorders related to use, overuse and pressure, unspecified ankle and foot
- M70.88 Other soft tissue disorders related to use, overuse and pressure other site
- M70.89 Other soft tissue disorders related to use, overuse and pressure multiple sites
- M70.90 Unspecified soft tissue disorder related to use, overuse and pressure of unspecified site
- M70.911 Unspecified soft tissue disorder related to use, overuse and pressure, right shoulder
- M70.912 Unspecified soft tissue disorder related to use, overuse and pressure, left shoulder
- M70.919 Unspecified soft tissue disorder related to use, overuse and pressure, unspecified shoulder
- M70.921 Unspecified soft tissue disorder related to use, overuse and pressure, right upper arm
- M70.922 Unspecified soft tissue disorder related to use, overuse and pressure, left upper arm
- M70.929 Unspecified soft tissue disorder related to use, overuse and pressure, unspecified upper arm
- M70.931 Unspecified soft tissue disorder related to use, overuse and pressure, right forearm
- M70.932 Unspecified soft tissue disorder related to use, overuse and pressure, left forearm
- M70.939 Unspecified soft tissue disorder related to use, overuse and pressure, unspecified forearm
- M70.941 Unspecified soft tissue disorder related to use, overuse and pressure, right hand
- M70.942 Unspecified soft tissue disorder related to use, overuse and pressure, left hand
- M70.949 Unspecified soft tissue disorder related to use, overuse and pressure, unspecified hand
- M70.951 Unspecified soft tissue disorder related to use, overuse and pressure, right thigh
- M70.952 Unspecified soft tissue disorder related to use, overuse and pressure, left thigh
- M70.959 Unspecified soft tissue disorder related to use, overuse and pressure, unspecified thigh
- M70.961 Unspecified soft tissue disorder related to use, overuse and pressure, right lower leg
- M70.962 Unspecified soft tissue disorder related to use, overuse and pressure, left lower leg
- M70.969 Unspecified soft tissue disorder related to use, overuse and pressure, unspecified lower leg
- M70.971 Unspecified soft tissue disorder related to use, overuse and pressure, right ankle and foot
- M70.972 Unspecified soft tissue disorder related to use, overuse and pressure, left ankle and foot
- M70.979 Unspecified soft tissue disorder related to use, overuse and pressure, unspecified ankle and foot
- M70.98 Unspecified soft tissue disorder related to use, overuse and pressure other
- M70.99 Unspecified soft tissue disorder related to use, overuse and pressure multiple sites
M79 Other and unspecified soft tissue disorders, not elsewhere classified40 codes
- M79.0 Rheumatism, unspecified
- M79.10 Myalgia, unspecified site
- M79.11 Myalgia of mastication muscle
- M79.12 Myalgia of auxiliary muscles, head and neck
- M79.18 Myalgia, other site
- M79.601 Pain in right arm
- M79.602 Pain in left arm
- M79.603 Pain in arm, unspecified
- M79.604 Pain in right leg
- M79.605 Pain in left leg
- M79.606 Pain in leg, unspecified
- M79.609 Pain in unspecified limb
- M79.621 Pain in right upper arm
- M79.622 Pain in left upper arm
- M79.629 Pain in unspecified upper arm
- M79.631 Pain in right forearm
- M79.632 Pain in left forearm
- M79.639 Pain in unspecified forearm
- M79.641 Pain in right hand
- M79.642 Pain in left hand
- M79.643 Pain in unspecified hand
- M79.644 Pain in right finger(s)
- M79.645 Pain in left finger(s)
- M79.646 Pain in unspecified finger(s)
- M79.651 Pain in right thigh
- M79.652 Pain in left thigh
- M79.659 Pain in unspecified thigh
- M79.661 Pain in right lower leg
- M79.662 Pain in left lower leg
- M79.669 Pain in unspecified lower leg
- M79.671 Pain in right foot
- M79.672 Pain in left foot
- M79.673 Pain in unspecified foot
- M79.674 Pain in right toe(s)
- M79.675 Pain in left toe(s)
- M79.676 Pain in unspecified toe(s)
- M79.7 Fibromyalgia
- M79.81 Nontraumatic hematoma of soft tissue
- M79.89 Other specified soft tissue disorders
- M79.9 Soft tissue disorder, unspecified
M99 Biomechanical lesions, not elsewhere classified6 codes
- M99.00 Segmental and somatic dysfunction of head region
- M99.05 Segmental and somatic dysfunction of pelvic region
- M99.06 Segmental and somatic dysfunction of lower extremity
- M99.07 Segmental and somatic dysfunction of upper extremity
- M99.08 Segmental and somatic dysfunction of rib cage
- M99.09 Segmental and somatic dysfunction of abdomen and other regions
R26 Abnormalities of gait and mobility1 code
- R26.2 Difficulty in walking, not elsewhere classified
ICD-10-PCS
Procedure Codes
Procedure codes do not drive assignment for this DRG. DRG 555 is a Medical DRG, assigned from the principal diagnosis above.
Frequently Asked Questions
What is MS-DRG 555?
MS-DRG 555 (Signs and Symptoms of Musculoskeletal System and Connective Tissue with MCC) is a medical DRG in MDC 08 (Diseases & Disorders of the Musculoskeletal System & Connective Tissue). Its FY 2026 relative weight is 1.3218 with a geometric mean length of stay of 3.8 days.
What is the difference between DRG 555, 556?
All 2 share the same base category; the severity of secondary diagnoses separates them: 555 (with MCC), 556 (without 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 diagnosis codes group to DRG 555?
247 ICD-10-CM principal diagnosis codes group to this DRG, spanning 8 three-character categories.
What is the relative weight of DRG 555?
The FY 2026 relative weight of this DRG is 1.3218, meaning reimbursement of roughly 1.32 times the average Medicare inpatient case. Multiply by a hospital's blended base rate for the approximate payment.
← PreviousDRG 554 – Bone Diseases and Arthropathies without MCCNext →DRG 556 – Signs and Symptoms of Musculoskeletal System and Connective
Source: CMS ICD-10 MS-DRG v43.0 Definitions Manual and the FY 2026 IPPS Final Rule (Table 5), effective October 1, 2025 through September 30, 2026. We publish the DRG assignments as CMS defines them and add the navigation, search, and code links.
