Prior authorization / billing requirement for add-on codes

Add-on codes must be reported in conjunction with an appropriate primary (parent) procedure code by the same physician or qualified provider on the same date of service; both parent and add-on must be submitted on the same claim and performed at the same patient encounter with the same place of service. An add-on code is eligible for payment only if one of its primary codes is also billed and allowed; if the parent is denied or absent the add-on will be denied and a corrected claim is required to remedy the denial. Clinical edits will identify and deny incorrectly billed add-on codes and no modifier will bypass such a denial.

• Report parent and add-on on same claim and same date of service by the same provider (same POS).
• Add-on payable only when an appropriate parent code is billed and allowed; parent denial leads to add-on denial.
• Corrected claim is required when parent code was not submitted or was denied; Customer Service phone calls cannot overturn denials.
• Clinical/NCCI edits may deny add-on codes; no modifier will bypass an add-on coding violation.

Special circumstances where add-on billing rules differ

Certain special circumstances modify the usual same-date/same-provider requirement. For example, anesthesia for planned vaginal labor that becomes an unplanned cesarean or cesarean hysterectomy may allow the neuraxial labor anesthesia (01967) to be billed on a prior date and by a different provider/group while allowing the add-on cesarean anesthesia codes (01968, 01969). Additional rules apply for assistants/co-surgeons, co-surgery, mid-level providers, and critical care reporting.

• Anesthesia: 01967 (parent) may be billed for a prior date when neuraxial analgesia begins before midnight and cesarean occurs after midnight; 01968/01969 allowed even if 01967 not billed by same provider/group.
• Assistant/co-surgeon and co-surgery: primary surgeon must report both parent and add-on for assistant to report assistant services; one co‑surgeon may not report an orphan add-on with modifier 62 — both surgeons must report both components.
• Mid‑level providers: a mid‑level may not report an add‑on for a primary service billed by the supervising physician; both services must be provided and billed by the same person.
• Critical care: only one physician in the same specialty/group may report 99291; others report 99292 and 99292 is denied without an allowed 99291 by the same specialty group for that date.