title: [The 4-3-2-1 rule for the chronic disease code].
authors.forename: Helmut
authors.initials: H
authors.lastname: Walbert
mesh_terms: D002908:Chronic Disease / Q000191:economics* / Q000628:therapy; D059019:Clinical Coding / Q000191:economics / Q000331:legislation & jurisprudence*; D005251:Fees, Medical / Q000331:legislation & jurisprudence*; D058006:General Practice / Q000331:legislation & jurisprudence*; D009313:National Health Programs / Q000331:legislation & jurisprudence*; D012051:Reimbursement Mechanisms / Q000331:legislation & jurisprudence*