CPT code 61107: Ventricular catheter, twist-drill access2026 Medicare rate & RVUs in Michigan
Twist-drill ventricular catheter placement for temporary intracranial drainage, reported when a catheter is implanted through a small cranial opening to drain a ventricle.
CMS doesn’t publish an office rate for 61107 in Michigan.
Medicare allowed amount for participating (non-QP) physicians, before deductible, coinsurance and claim adjustments. Not a patient’s bill or a hospital charge.
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What 61107 covers
This service involves making a small twist-drill opening in the skull and placing a ventricular catheter through it to provide drainage. Neurosurgeons commonly use it for temporary cerebrospinal-fluid diversion or pressure management, such as acute hydrocephalus or ventricular blood obstructing normal CSF flow. It is generally performed in a hospital or other facility setting, with catheter drainage often managed in an intensive care or neurosurgical unit.
Report 61107 when the documented access is twist-drill and the procedure includes placement of a ventricular drainage catheter. Select a subdural drainage or hematoma-evacuation code when that is the procedure instead; a burr-hole approach has different code selection. The operative note should identify the opening technique, ventricular target, catheter placement, and drainage purpose. CMS assigns a 0-day global period, so same-day preoperative and postoperative care is included. Modifier 50 is inappropriate. Medicare does not pay an assistant at surgery for this service; co-surgeons and team surgery are not permitted.
This summary was written with AI assistance from CMS physician fee schedule data and checked against the CMS billing rules shown here. Rates on this page come directly from CMS files.
Where 61107 pays more and less in Michigan
| Payment locality | Office | Facility |
|---|---|---|
| Detroit, MI | Unavailable | $332.34 |
| Rest of Michigan | Unavailable | $291.43 |
How the 61107 rate is calculated
Each of 61107’s three RVUs is multiplied by a geographic index (GPCI) for the payment locality, added up, and multiplied by the conversion factor. Drag the indexes or enter a ZIP to see what moves the rate.
How the rate is built · 61107
RVUs × geographic indexes × conversion factor
Work4.87
4.87 RVUs× 1.000 GPCI
Practice expense1.70
1.70 RVUs× 1.000 GPCI
Malpractice2.04
2.04 RVUs× 1.000 GPCI
Adjusted RVUs
8.6100
Conversion factor
$33.4009
Medicare rate
$287.58
Every GPCI starts at 1.000, the national rate. Enter a ZIP or drag a slider.
Payment rules and modifiers for 61107
The CMS indicators that decide how 61107 is paid alongside other services.
CMS payment indicators · 61107
Ventricular catheter, twist-drill access
| Rule | CMS value | What it means |
|---|---|---|
| Global period | 000 | Same-day global: pre- and post-op care on the day of the procedure is included. |
| Multiple procedures | 0 | No multiple-procedure reduction. |
| Bilateral (modifier 50) | 0 | The 150% bilateral adjustment doesn’t apply. |
| Assistant at surgery (80/81/82/AS) | 1 | Not paid (statutory restriction). |
| Co-surgeons (62) | 0 | Not permitted. |
| Team surgery (66) | 0 | Not permitted. |
| Professional/technical | 0 | Physician service: no professional/technical split. |
61107 compared with similar codes
Compare codes · National
4 codes, side by side
How to choose
- 61105Twist-drill punctureHematoma drainage
- Use 61107 when a ventricular drainage catheter is implanted through twist-drill access. 61105 describes a different twist-drill drainage service, such as drainage directed to a subdural collection.
- 61108Subdural drainageTwist-drill approach
- 61108 is for twist-drill evacuation or drainage of a subdural hematoma. 61107 is selected for implantation of a ventricular catheter for drainage.
- 61210Ventricular accessImplanted catheter, reservoir, or electrode
- Both codes involve ventricular catheter implantation, but 61210 uses burr-hole access. Choose based on the documented cranial opening technique.
61107 billing questions
How does 61107 differ from 61105?
61107 describes twist-drill access with placement of a ventricular drainage catheter. Use 61105 when the documented procedure is for subdural drainage rather than implantation of a ventricular catheter.
How does 61107 differ from 61108?
61107 is for ventricular catheter placement through twist-drill access. 61108 describes twist-drill access for evacuation or drainage of a subdural hematoma.
Does 61107 include the catheter placement?
Yes. The service includes the twist-drill access and placement of the ventricular drainage catheter; the operative note should support both.
Can modifier 50 be used for bilateral placement?
No. CMS identifies bilateral adjustment as inappropriate for this code, so modifier 50 is not appropriate.
Can an assistant or co-surgeon be reported?
Medicare does not pay an assistant at surgery for 61107. Co-surgeons and team surgery are not permitted.
What does the 0-day global period include?
Same-day preoperative and postoperative care is included in the procedure's 0-day global period.
Where these rates come from
FeeBase calculates base physician payments from CMS work, practice-expense and malpractice RVUs, adjusted by each locality’s geographic indexes and the conversion factor. Services without a published rate are labeled, never given a made-up amount. Amounts are Medicare allowed amounts before claim adjustments: not a patient’s bill or a commercial rate.
CMS RVU26D · effective Oct 1, 2026 through the day before Jan 1, 2027
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