M90: Osteopathies in diseases classified elsewhere
M90.5: Osteonecrosis in diseases classified elsewhere

codeFirst
underlying disease, such as:
caisson disease (T70.3)
hemoglobinopathy (D50-D64)
M90.50: Osteonecrosis in diseases classified elsewhere, unspecified site
M90.51: Osteonecrosis in diseases classified elsewhere, shoulder
M90.52: Osteonecrosis in diseases classified elsewhere, upper arm
M90.53: Osteonecrosis in diseases classified elsewhere, forearm
M90.54: Osteonecrosis in diseases classified elsewhere, hand
M90.55: Osteonecrosis in diseases classified elsewhere, thigh
M90.56: Osteonecrosis in diseases classified elsewhere, lower leg
M90.57: Osteonecrosis in diseases classified elsewhere, ankle and foot
M90.58: Osteonecrosis in diseases classified elsewhere, other site
M90.59: Osteonecrosis in diseases classified elsewhere, multiple sites

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