Version June 2024
| AAST grade | Description | Clinical criteria | Imaging criteria (CT findings) | Operative criteria | Pathologic criteria |
| I | Cellulitis | Folliculitis, erysipelas, impetigo, simple cellulitis | Superficial inflammation with no subcutaneous stranding | N/A | Acute inflammation involving epidermis only |
| II | Superficial necrosis or liquefaction | Necrotizing, blistering, or bullous cellulitis or skin necrosis | Subcutaneous stranding, but no abscess | N/A | Acute inflammation involving epidermis and dermis |
| III | Subcutaneous abscess | Subcutaneous abscess | Well-defined (walled off) subcutaneous fluid collection with surrounding inflammation | Well-defined subcutaneous fluid collection | Acute inflammation involving epidermis, dermis, and subcutaneous fat with cultures positive for organisms if available |
| IV | Fasciitis | Fasciitis | Inflammation extending to fascia; likely air along fascia margins | Clear involvement of fascia with healthy, viable muscle underneath | Acute inflammation involving epidermis, dermis, subcutaneous fat, and muscular fascia with cultures positive for organisms if available |
| V | Myonecrosis | Myonecrosis | Air deep to fascia; likely poor perfusion of muscle | Extension of necrosis into muscle and deeper tissue | Acute inflammation involving epidermis, dermis, subcutaneous fat, muscular fascia, adjacent tissue (muscle, etc.) with cultures positive for organisms if available |
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