- A/R (accounts receivable)
- Money owed to you for claims that haven't been paid yet.
- Base units
- The fixed value for each anesthesia code that reflects how complex the procedure is.
- Clean claim
- A claim with no errors that a payer can process on the first try.
- Concurrency
- How many cases an anesthesiologist is medically directing at the same time.
- Conversion factor
- The dollar amount a payer pays per unit. See conversion factor.
- Credentialing
- The process of getting a provider approved by a payer.
- Days in A/R
- How long, on average, it takes to get paid. See days in A/R.
- Denial
- A claim the payer refused to pay. See common denials.
- EOB / ERA
- The payer's explanation of what it paid and why, on paper or electronically.
- MAC
- Monitored anesthesia care. Also short for Medicare Administrative Contractor, the company that processes Medicare claims in your region.
- Medical direction
- An anesthesiologist directing up to four CRNA cases at once while meeting seven requirements.
- Net collection rate
- The share of what you could collect that you actually collected.
- NPI
- National Provider Identifier, the ID number for each provider and group.
- Opt-out state
- A state where the governor has removed Medicare's physician supervision requirement for CRNAs.
- Physical status (P1 to P6)
- A rating of the patient's health. Some payers pay extra units for P3 and above.
- QK, QX, QY, QZ, AA, AD
- Modifiers that show how a case was staffed. See CRNA modifiers.
- QS, G8, G9
- Modifiers used with monitored anesthesia care.
- Qualifying circumstances
- Add-on codes for extreme age, hypothermia, hypotension or emergencies.
- Reassignment
- When a provider lets a group bill and be paid for their services.
- Time units
- Anesthesia time, usually counted in 15-minute units.
This article is general information, not billing, legal or tax advice. Payer rules change; always check current guidance.
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