CPT
00100 — Anesthesia for procedures on salivary glands, including biopsy
Anesthesia time = base units + minutes ÷ 15. Verify the math.
Anesthesia
01400 — Anesthesia for open or arthroscopic procedures on knee joint
This code covers anesthesia for knee surgery including total knee replacement, ACL repair, or knee arthroscopy.
- Typical setting: Hospital operating room, ASC
- National avg charge (illustrative): $600–$2,000 depending on time; base units = 5
- Most-disputed reason: Time padding: billing extra 15-minute time units beyond documented anesthesia time
What it means
What 01400 actually means
This code covers anesthesia for knee surgery including total knee replacement, ACL repair, or knee arthroscopy. It applies to both open surgical and arthroscopic (minimally invasive) procedures.
Common errors with this code
What goes wrong on real bills.
Most bills that look correct still contain at least one of these issues. Up to 49% of medical bills contain errors (CFPB).
- Time padding: billing extra 15-minute time units beyond documented anesthesia time
- Billing lateral modifiers (RT/LT) — many payers do not require laterality for anesthesia codes
- Billing a higher-complexity code when the simpler knee arthroscopy code 01382 was more appropriate
If you see 01400 on your bill
Three steps before paying.
1. Get the itemized bill. If your statement only shows a summary, request the CPT-level itemized bill before paying. Generate the request language →
2. Cross-check against the EOB. Compare what your insurer's Explanation of Benefits says you owe versus what the hospital is asking. They disagree more often than people think. Read the bill-vs-EOB guide →
3. Run a free Bill Scan. Upload the bill (and EOB if you have it) and BillBusted will flag the most likely issues with this specific code in your specific state. Run free scan →
Related codes
Other codes in this category.
People who land on 01400 often also see these adjacent codes on the same bill.
CPT
00400 — Anesthesia for procedures on integumentary system, extremities, anterior trunk, perineum, NOS
Anesthesia time = base units + minutes ÷ 15. Verify the math.
CPT
00567 — Anesthesia for direct coronary artery bypass grafting; with pump oxygenator
Anesthesia time = base units + minutes ÷ 15. Verify the math.
CPT
00731 — Anesthesia for upper GI endoscopic procedure, endoscope to proximal duodenum
Anesthesia time = base units + minutes ÷ 15. Verify the math.
CPT
00811 — Anesthesia for lower intestinal endoscopic procedure, endoscope introduced distal to duodenum
Anesthesia time = base units + minutes ÷ 15. Verify the math.
CPT
01480 — Anesthesia for open procedures on bones of lower leg, ankle, and foot
Anesthesia time = base units + minutes ÷ 15. Verify the math.
Related BillBusted guides
Plain-English reads if you see 01400 on a bill.
01400 FAQ
Plain-English answers.
What does 01400 usually cost?
$600–$2,000 depending on time; base units = 5. Costs vary by region, payer contract, and whether the service was performed in a hospital outpatient department (which adds a facility fee) versus a free-standing clinic.
What's the most common billing error on 01400?
Time padding: billing extra 15-minute time units beyond documented anesthesia time
What should I do if I see 01400 on my bill?
Request the itemized bill and the matching EOB from your insurer. Compare the units/quantity billed against what you actually received. Run a free BillBusted scan to flag the most likely errors specific to 01400 before paying.
Don't pay 01400 blindly.
The free scan tells you in under 60 seconds whether this charge looks reasonable for your situation.