Hills Cat Food
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What the letter codes mean Prescription Diet uses two-letter codes rather than names. Each letter is a mnemonic for what the diet is for: c/d Crystals, for urinary health and struvite management d/d Dermatology, for food sensitivities and skin i/d Intestinal, for digestive and gastrointestinal problems k/d Kidney, for renal care, with a separate Early Stage version m/d Metabolic, for weight and glucose management t/d Teeth, for dental care y/d For thyroid care z/d For food sensitivities, using hydrolysed protein Metabolic and Gastrointestinal Biome are named rather than coded. Match the code on your vet's note exactly, because similar-looking codes are entirely different foods and c/d Multicare and c/d Urinary Stress are not interchangeable either.