Needle placement into muscle or soft tissue for radiation therapy treatment field localization or targeting purposes.

Verified May 8, 2026 · 5 sources ↓

Medicare: $279.57
Total RVUs: 8.37
Global, days: 0
Region: General

Drawn from CMSCgsmedicare

Documentation requirements

What must appear in the operative or office note to support the claim.

Source · Editorial brief grounded in 5 cited references ↓

Specify the anatomic site and depth of needle placement — vague terms like 'soft tissue target area' are insufficient for audit defense.
State the clinical indication tying the procedure to the radiation therapy treatment plan, including the treating oncologist's order or plan.
Document the number of needles placed and the tissue type (muscle vs. subcutaneous vs. other soft tissue) for each insertion.
If imaging guidance was used, include a formal interpretation note referencing the modality, not just a mention in the operative note.
Record the laterality and, where applicable, the specific muscle or tissue compartment targeted.

Applicable modifiers

Modifiers commonly billed with this code.

Source · AMA CPT modifier descriptors · CMS NCCI Policy Manual

22 Increased complexity 25 Significant separate E/M 26 Professional component 50 Bilateral procedure 51 Multiple procedures 52 Reduced services 59 Distinct service LT Left side RT Right side XS Separate structure

What this code covers

Source · Editorial summary grounded in 5 cited references ↓

CPT 20555 covers the insertion of needles into muscle or soft tissue to establish reference points or targets for radiation therapy. The procedure is typically performed by a surgeon or interventional physician working in coordination with a radiation oncology team to precisely mark treatment fields before stereotactic body radiation therapy (SBRT) or other external beam techniques.

The 000-day global period means no pre- or post-operative visits are bundled — each encounter bills independently. That makes same-day E/M billing cleaner, but it also means no automatic post-procedure follow-up protection exists; every related visit after the day of service is separately billable and separately auditable.

Fluoroscopic or ultrasound guidance used to place the needles is not inherently included in 20555. Check current NCCI edits before appending imaging guidance codes, as payer and CMS bundling rules for radiology guidance with needle placement procedures are strictly enforced. When imaging guidance is separately reportable, documentation must clearly support the medical necessity of that guidance and include a formal interpretation.

RVU & reimbursement

Component RVUs and Medicare national rate. Actual payment varies by GPCI locality.

Source · CMS Physician Fee Schedule, RVU26A · January 2026

Work RVU	5.85
Practice expense RVU	2.06
Malpractice RVU	0.46
Total RVU	8.37
Medicare national rate	$279.57
Global period	0 days

Payment by site of service

Medicare pays different rates by setting. HOPD typically pays substantially more than ASC for the same procedure.

Source · CMS OPPS Addendum B·ASC HCPCS payment rates·2026

Setting	Medicare rate (national)
Office (PFS non-facility) Procedure performed in physician's office	$279.57
HOPD (APC 5113) Hospital outpatient department	$3,342.87
ASC (PI R2) Ambulatory surgical center (freestanding)	$1,644.87

Common denial reasons

The recurring reasons claims for CPT 20555 get rejected.

Source · Editorial brief grounded in CMS NCCI edits, AAOS coding appeals, and cited references ↓

Missing or absent radiation therapy treatment plan linking the needle placement to a documented oncologic indication.
Imaging guidance code billed same-day without documentation of a separate formal interpretation, triggering NCCI bundling denial.
Insufficient documentation of anatomic specificity — operative notes that do not name the muscle or tissue compartment are flagged on audit.
Modifier absent when a same-day E/M is billed, causing the E/M to deny as bundled into the 000-day global.
Procedure billed under wrong specialty or provider type when performed in coordination with radiation oncology, causing payer mismatch edits.

Frequently asked questions

Source · Generated from the editorial pipeline, verified against 5 cited references ↓

01Does 20555 include imaging guidance?

No. Fluoroscopic or ultrasound guidance is not inherently bundled into 20555. Whether you can bill it separately depends on current NCCI edits — run the code pair through the NCCI PTP lookup before appending a guidance code, and make sure your documentation includes a formal interpretation.

02What global period applies to 20555?

000-day global. No pre-op or post-op visits are bundled. Every encounter related to this procedure, including same-day E/M visits, bills independently — use modifier 25 on a same-day E/M to distinguish it from the procedure.

03Can 20555 be billed bilaterally with modifier 50?

Only if needles are placed bilaterally in anatomically distinct, non-contiguous sites for separate treatment field localization. Document each side's indication and placement separately. NCCI policy cautions against using laterality modifiers to bypass edits when the procedures are performed in contiguous structures.

04Is 20555 appropriate for fiducial marker placement for prostate SBRT?

No. Transperineal or transrectal fiducial marker placement for prostate SBRT uses different codes. CPT 20555 is specific to needle placement into muscle or non-organ soft tissue for radiation therapy field localization — confirm with your radiation oncology team which code maps to the actual procedure being performed.

05How does the site of service affect reimbursement for 20555?

Significantly. The HOPD payment and ASC payment differ substantially — see the Site of Service comparison table on this page. Performing this procedure in an ASC versus a hospital outpatient setting changes the facility payment and the physician's site-of-service differential. Factor that into where you schedule the procedure.

06What ICD-10 codes support medical necessity for 20555?

The primary diagnosis should reflect the malignancy or target lesion driving radiation therapy — typically a C-code for the primary tumor or a Z-code for encounter related to radiation therapy. A diagnosis of a benign condition without a documented radiation treatment plan will not establish medical necessity.

Sources & references

Editorial content was developed using the following public sources. Last verified May 8, 2026.

Mira AI Scribe

Mira's AI scribe captures the anatomic site by name (specific muscle or tissue compartment), needle count, laterality, and the explicit link to the radiation therapy treatment plan from dictation. It also flags whether imaging guidance was used and whether a formal interpretation was dictated — preventing the most common denial: a guidance code submitted without a separately documented interpretation report.

See how Mira captures CPT 20555 documentation