Look up an ATC code at level 1-4 to get its name and hierarchy level.
Use this tool to:
- Resolve an ATC code (e.g., "A10BA") to its class name ("Biguanides")
- Confirm a code exists in the current ATC index
- Identify the level (anatomical / therapeutic / pharmacological / chemical)
Accepts codes 1-5 characters long: "A" (anatomical), "A10" (therapeutic), "A10B" (pharmacological), "A10BA" (chemical). Substance-level codes (7 chars, e.g., "A10BA02") are not exposed by this endpoint — use atc_classify with the drug name to retrieve the substance code.
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