Federal IDR outcomes: Anesthesiology in California
In 2025 Q1–Q4, the provider or facility offer prevailed in 81.2% of 2,209 determined Federal IDR dispute line items for anesthesiology in California. The median prevailing offer was 3.94x the QPA (25th–75th percentile 1.42x–22.86x; n = 2,113). The median time to a decision was 24 business days (n = 2,209).
Determined line items
2,209
2025 Q1–Q4 · 6 split decisions excluded
Provider win rate
81.2%
n = 2,209 · 2025 Q1–Q4
Median payment vs QPA
3.94x
middle half 1.42x–22.86x · n = 2,113 · 2025 Q1–Q4
Median days to decision
24
business days, from dispute initiation · n = 2,209 · 2025 Q1–Q4
Dollar amounts are not shown for specialty groups: the CMS QPA and Offers file, the only source of dollar figures, has no specialty field. See methodology.
By period
| Period | Line items | Win % | Median ×QPA | 25th–75th | Ratio n | Median days |
|---|---|---|---|---|---|---|
| 2025 Q1–Q4 | 2,209 | 81.2% | 3.94x | 1.42x–22.86x | 2,113 | 24 |
| 2024 Q1–Q4 | 720 | 87.5% | 1.22x | 1.00x–2.82x | 319 | 368 |
| 2023 Q1–Q4 | 101 | 69.3% | – | – | 15 | 62 |
| 2023 Q1–2025 Q4 | 3,030 | 82.3% | 3.17x | 1.30x–19.54x | 2,447 | not pooled |
Line items = determined dispute line items (n). Win rate excludes split decisions and includes default decisions. Ratio n = line items reporting a payment-to-QPA ratio. Days are business days as reported by CMS (2023–2024: from IDR entity assignment; 2025: from initiation) and are never pooled.
Most disputed CPT codes
| CPT code | Line items | Win % | Median ×QPA | Ratio n | Median days |
|---|---|---|---|---|---|
| 99135 Use of low blood pressure complicating anesthesia | 150 | 84.7% | 49.04x † | 150 | 25 |
| 00812 Anesthesia for exam of colon using an endoscope | 101 | 96.0% | – | 21 | 516 |
| 00142 Anesthesia for lens surgery | 82 | 81.7% | 24.61x † | 82 | 20.5 |
| 01400 Anesthesia for other procedure or exam of knee joint using an endoscope | 80 | 77.5% | 13.42x | 80 | 25 |
| 01967 Anesthesia for labor during planned vaginal delivery | 80 | 80.0% | 4.19x | 79 | 23.5 |
| 01992 Anesthesia for nerve block and injection procedure, prone position | 66 | 90.9% | 29.42x † | 66 | 23 |
| 00811 Anesthesia for other procedure on large bowel using an endoscope | 64 | 78.1% | 19.72x | 64 | 20 |
| 00840 Anesthesia for other procedure on lower abdomen | 59 | 78.0% | 3.67x | 59 | 19 |
| 00790 Anesthesia for other procedure on upper abdomen | 52 | 86.5% | 3.20x | 52 | 24 |
| 00731 Anesthesia for other procedure on esophagus, stomach, or upper small bowel using | 49 | 75.5% | 14.57x | 49 | 24 |
| 76942 Ultrasonic guidance for needle placement | 42 | 88.1% | 115.97x † | 42 | 23 |
| 00160 Anesthesia for other procedure on nose and sinuses | 36 | 69.4% | 3.22x | 36 | 24 |
| 00670 Anesthesia for extensive surgery on spine | 36 | 88.9% | 6.71x | 35 | 22.5 |
| 01810 Anesthesia for procedure on nerves, muscles, tendons, and tissue of forearm, wri | 34 | 85.3% | 19.19x | 34 | 22 |
| 64447 Injection of anesthetic agent and/or steroid into thigh nerve (femoral nerve) | 33 | 81.8% | 28.63x † | 33 | 27 |
| 99100 Age complicating anesthesia (younger than 1 year and older than 70 years) | 33 | 78.8% | – | 28 | 23 |
| 00902 Anesthesia for procedure on anus and rectum | 31 | 61.3% | 3.82x | 31 | 19 |
| 01480 Anesthesia for other procedure on lower leg, ankle, and foot bones | 30 | 86.7% | 3.34x | 30 | 25 |
2025 Q1–Q4 · rows with n ≥ 30 determined line items · sorted by n.
Related: all specialties in California · Anesthesiology in all states
FAQ
What is the Federal IDR provider win rate for anesthesiology in California?
In 2025 Q1–Q4, the provider or facility offer was selected in 81.2% of 2,209 determined dispute line items for anesthesiology in California. Split decisions are excluded from the denominator and default decisions are included. Withdrawn, settled and ineligible disputes are not in the CMS data.
How do Federal IDR payments compare with the QPA for anesthesiology in California?
In 2025 Q1–Q4, the median prevailing offer was 3.94x the qualifying payment amount (QPA), with a 25th to 75th percentile range of 1.42x to 22.86x (n = 2,113 line items). This uses the CMS field Prevailing Party Offer as % of QPA, where 1.00x equals the QPA.
How long do Federal IDR decisions take for anesthesiology in California?
In 2025 Q1–Q4, the median was 24 business days (n = 2,209 line items), using the CMS field Length of Time to Make Determination (from dispute initiation).