Lab Fees and Payments on a Doctor's Bill

Got an explanation of benefits from BCBS today for a doctor's visit (routine GYN).

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Office visit, Well Care (annual), 99396, Charge $250, payment $97.41.

Pap smear, obtaining, and transmitting to lab, Q0091, Charge $100, payment $0.

Lab test, bacteruria, other than culture or dipstick (?), 81007, Charge $50, payment $1.07.
   (Medicare CLFS, 81007, $29.98).
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This is an in-network physician so BCBS charges/copays represent payment in full.