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Dysbaric Osteonecrosis S021

Last amended 
30 June 2015
Current RMA Instruments:
Reasonable Hypothesis SOP
17 of 2015
Balance of Probabilities SOP
18 of 2015
Changes from Previous Instruments:

SOP Bulletin 179

ICD Coding:
  • ICD-9-CM Codes: 993.32
  • ICD-10-AM Codes: T70.32

This is the destruction of bone (osteonecrosis) resulting from suffering significant episodes of decompression. The pathophysiology seems to relate to ischaemia and infarction of the bone associated with nitrogen bone vessel embolism.

Is specific diagnostic evidence required to apply the SOP? - Yes.

Diagnosis is based on imaging with CT [computerised axial tomogram] scan or MRI [magnetic resonance imaging] scan of the bones. The relevant medical specialist is an orthopaedic surgeon.

Are there sub-factors that require specific diagnostic information? - No.
Additional diagnoses covered by SOP
  • Nil
Conditions excluded from SOP
  • Decompression sickness, ICD 9 code 993.30
  • Pulmonary barotrauma, ICD 9 code 993.31
Unconfirmed diagnosis

If, after applying the above information, you are unable to confirm the diagnosis, you should then seek medical officer advice about further investigation.