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39.95: Hemodialysis
40.0: Incision of lymphatic structures
39.43: Removal of arteriovenous shunt for renal dialysis
38.95: Venous catheterization for renal dialysis
39.42: Revision of arteriovenous shunt for renal dialysis
Cluster 22:
39.93: Insertion of vessel-to-vessel cannula
80.82: Other local excision or destruction of lesion of joint (elbow)
54.3: Excision or destruction of lesion or tissue of abdominal wall or umbilicus
85.0: Mastotomy
82.01: Exploration of tendon sheath of hand
Both of these clusters (as shown in Table 1) have a high incidence rate of MRSA. Contrast these with
cluster 2 with a low incidence rate of MRSA:
81.02 Other cervical fusion, anterior technique
84.51 Insertion of interbody spinal fusion device
81.62 Fusion or refusion of 2-3 vertebrae
81.08 Lumbar and lumbosacral fusion, posterior technique
81.51 Total hip replacement
Another cluster with a high proportion of MRSA is 31:
86.04: Other incision with drainage of skin and subcutaneous tissue
21.1: Incision of nose
71.09: Other incision of vulva and perineum
Similarly, cluster 25 starts in the same way, with procedures related to wounds:
86.04: Other incision with drainage of skin and subcutaneous tissue
83.19: Other division of soft tissue
86.22: Excisional debridement of wound, infection, or burn
38.93: Venous catheterization, not elsewhere classiied
78.6: Removal of implanted devices from bone
86.66: Homograft to skin
Figure 25 shows a representation of the patients classified into Cluster 6. The multiple diagnosis codes
for diabetes are very prominent, as are the diagnosis codes for osteomyelitis (730). However, there are
also a number of patients with diagnoses 681 and 682 (Cellulitis and abscess of finger and toe, Other
cellulitis and abscess). These two diagnoses commonly accompany a diagnosis of osteomyelitis. For
this reason, they are given a lower weight when there is also a diagnosis of osteomyelitis and are not
used to characterize the cluster when using text analysis.
Similarly, Figure 26 shows some of the patients classified into cluster 7. In this cluster, diagnosis 681
is again quite prominent. However, in contrast to cluster 6, there is no accompanying diagnosis of 730
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