New York Subscriber
Answer: Coders offer many suggestions for a diagnosis in this case, including V65.5 (Person with feared complaint in whom no diagnosis was made), 784.0 (Headache) or 346.9x (Migraine, unspecified) (if the physician actually diagnosed a headache or migraine).
If your neurologist truly believes the patient is faking the illness to obtain medication, go for the hard-hitting diagnosis: V65.2 (Person feigning illness).
Document it: If your physician really believes the patient is seeking drugs, he should flag the patient's chart for future reference.